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Bao Z, Yu D, Fu J, Gu J, Xu J, Qin L, Hu H, Yang C, Liu W, Chen L, Wu R, Liu H, Xu H, Guo H, Wang L, Zhou Y, Li Q, Wang X. 2-Hydroxy-5-nitro-3-(trifluoromethyl)pyridine as a Novel Matrix for Enhanced MALDI Imaging of Tissue Metabolites. Anal Chem 2024; 96:5160-5169. [PMID: 38470972 DOI: 10.1021/acs.analchem.3c05235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2024]
Abstract
Matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI), which is a label-free imaging technique, determines the spatial distribution and relative abundance of versatile endogenous metabolites in tissues. Meanwhile, matrix selection is generally regarded as a pivotal step in MALDI tissue imaging. This study presents the first report of a novel MALDI matrix, 2-hydroxy-5-nitro-3-(trifluoromethyl)pyridine (HNTP), for the in situ detection and imaging of endogenous metabolites in rat liver and brain tissues by MALDI-MS in positive-ion mode. The HNTP matrix exhibits excellent characteristics, including strong ultraviolet absorption, μm-scale matrix crystals, high chemical stability, low background ion interference, and high metabolite ionization efficiency. Notably, the HNTP matrix also shows superior detection capabilities, successfully showing 185 detectable metabolites in rat liver tissue sections. This outperforms the commonly used matrices of 2,5-dihydroxybenzoic acid and 2-mercaptobenzothiazole, which detect 145 and 120 metabolites from the rat liver, respectively. Furthermore, a total of 152 metabolites are effectively detected and imaged in rat brain tissue using the HNTP matrix, and the spatial distribution of these compounds clearly shows the heterogeneity of the rat brain. The results demonstrate that HNTP is a new and powerful positive-ion mode matrix to enhance the analysis of metabolites in biological tissues by MALDI-MSI.
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Affiliation(s)
- Zhibin Bao
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Dian Yu
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Jinxiang Fu
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Jianchi Gu
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Jia Xu
- Department of Clinical Laboratory, Xiyuan Hospital, China Academy of Chinese Medical Sciences, #1 Xiyuangcaochang, Beijing 100091, China
| | - Liang Qin
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Hao Hu
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Chenyu Yang
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Wenjuan Liu
- Department of Clinical Laboratory, Xiyuan Hospital, China Academy of Chinese Medical Sciences, #1 Xiyuangcaochang, Beijing 100091, China
| | - Lulu Chen
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Ran Wu
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Haiqiang Liu
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Hualei Xu
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Hua Guo
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Lei Wang
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Yijun Zhou
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
| | - Qi Li
- Department of Clinical Laboratory, Xiyuan Hospital, China Academy of Chinese Medical Sciences, #1 Xiyuangcaochang, Beijing 100091, China
| | - Xiaodong Wang
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Beijing 100081, China
- Centre for Imaging & Systems Biology, College of Life and Environmental Sciences, Minzu University of China, #27 Zhongguancun South Avenue, Beijing 100081, China
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Nguyen T, Spriet I, Quintens C, Thi Thanh Ha P, Van Schepdael A, Adams E. Simultaneous determination of ceftazidime and pyridine in human plasma by LC-UV. J Pharm Biomed Anal 2023; 228:115319. [PMID: 36858005 DOI: 10.1016/j.jpba.2023.115319] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 02/03/2023] [Accepted: 02/24/2023] [Indexed: 02/27/2023]
Abstract
A sensitive, accurate and precise liquid chromatography (LC) method for the simultaneous determination of ceftazidime and pyridine in human plasma has been developed and validated. Acetonitrile (ACN) was employed to precipitate the proteins in the plasma samples. Chromatographic separation was performed with a Kinetex® C18 (150 mm × 3 mm, 2.6 µm) column with gradient elution. Ammonium formate 20 mM and ACN were mixed in a ratio of 98:2 (v/v) for mobile phase A and 85:15 (v/v) for mobile phase B. Both were adjusted to pH 4.5 with formic acid. The flow rate was 0.4 mL/min. UV detection was performed at 254 nm. Calibration curves were linear in the range from 0.3 to 225 μg/mL for ceftazidime and from 0.2 to 10 μg/mL for pyridine with correlation coefficients ≥ 0.999. Within- and between-run precision and accuracy were satisfactory with coefficients of variation (CV) ≤ 8.0% and deviations ≤ 7.0%, respectively. The method fulfilled all validation criteria prescribed by the European Medicines Agency guidelines. Next, it has been used successfully to analyze plasma samples of patients who received ceftazidime under intermittent and continuous administration. With intermittent administration, the concentration of the antibiotics reached a peak and then dropped quickly, which may be below the minimal inhibitory concentration (MIC). With continuous administration, the concentration of the antibiotics remained stable over 24 h, certainly above the MIC. Although the same tendency in ceftazidime concentration changes over time was observed, a difference in concentration amongst the patients was noticeable. The concentration of pyridine in plasma was negligible.
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Affiliation(s)
- Tam Nguyen
- KU Leuven, Department of Pharmaceutical and Pharmacological Sciences, Pharmaceutical Analysis, Herestraat 49, O&N2, PB 923, 3000 Leuven, Belgium
| | - Isabel Spriet
- Hospital Pharmacy Department, University Hospitals Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Charlotte Quintens
- Hospital Pharmacy Department, University Hospitals Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Pham Thi Thanh Ha
- Hanoi University of Pharmacy, Analytical Chemistry and Toxicology, 13-15 Le Thanh Tong, Hoan Kiem, Hanoi, Viet Nam
| | - Ann Van Schepdael
- KU Leuven, Department of Pharmaceutical and Pharmacological Sciences, Pharmaceutical Analysis, Herestraat 49, O&N2, PB 923, 3000 Leuven, Belgium
| | - Erwin Adams
- KU Leuven, Department of Pharmaceutical and Pharmacological Sciences, Pharmaceutical Analysis, Herestraat 49, O&N2, PB 923, 3000 Leuven, Belgium.
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Zhang Y, Liu YN, Xie S, Xu X, Xu RA. Evaluation of the inhibitory effect of quercetin on the pharmacokinetics of tucatinib in rats by a novel UPLC-MS/MS assay. Pharm Biol 2022; 60:621-626. [PMID: 35289238 PMCID: PMC8928849 DOI: 10.1080/13880209.2022.2048862] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 12/22/2021] [Accepted: 02/26/2022] [Indexed: 05/23/2023]
Abstract
CONTEXT Tucatinib (CYP2C8 substrate) and quercetin (CYP2C8 inhibitor) are two common drugs for the treatment of cancer. However, the effect of quercetin on the metabolism of tucatinib remains unknown. OBJECTIVE We validated a sensitive method to quantify tucatinib levels in rat plasma based on ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS), which was successfully employed to explore the effect of quercetin on tucatinib pharmacokinetics in rats. MATERIALS AND METHODS An Acquity UPLC BEH C18 column was applied to achieve the separation of tucatinib and internal standard (IS) talazoparib after protein precipitation with acetonitrile. Then, we used this assay to investigate the effect of different doses of quercetin (25, 50 and 100 mg/kg) on the exposure of orally administered tucatinib (30 mg/kg) in 24 Sprague-Dawley (SD) rats, which were randomly divided into three quercetin pre-treated groups and one control group (n = 6). RESULTS Our developed assay was verified in all aspects of bioanalytical method validation, involving lower limit of quantification (LLOQ), selectivity, accuracy and precision, calibration curve, extraction recovery, matrix effect and stability. After pre-treatment with 100 mg/kg quercetin, AUC0→t, AUC0→∞ and Cmax of tucatinib were remarkably increased by 75.4%, 75.8% and 59.1% (p < 0.05), respectively, while CLz/F was decreased significantly by 47.3% (p < 0.05) when compared with oral administration of 30 mg/kg tucatinib alone. This change is dose-dependent. CONCLUSIONS This study will help better understand the pharmacokinetic properties of tucatinib with concurrent use with quercetin, and more clinical verifications were inspired to confirm whether this interaction has clinical significance in humans.
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Affiliation(s)
- Ying Zhang
- Department of Pharmacy, HwaMei Hospital, University of Chinese Academy of Sciences (Ningbo No. 2 Hospital), Ningbo, China
- Ningbo Institute of Life and Health Industry, University of Chinese Academy of Sciences, Ningbo, China
| | - Ya-nan Liu
- The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Saili Xie
- The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Xuegu Xu
- The Eye Hospital of Wenzhou Medical University, Wenzhou, China
| | - Ren-ai Xu
- The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
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Hou Z, Zhou X, Zhao Z, Dong W, Wang H, Liu H, Zeng Z, Xie J. Advanced aromatic organic compounds removal from refractory coking wastewater in a step-feed three-stage integrated A/O bio-filter: Spectrum characterization and biodegradation mechanism. J Environ Manage 2022; 322:116140. [PMID: 36070652 DOI: 10.1016/j.jenvman.2022.116140] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 08/20/2022] [Accepted: 08/28/2022] [Indexed: 06/15/2023]
Abstract
Extensive presence of aromatic organic compounds (AOCs) is a major course for the non-biodegradability of coking wastewater (COW). In-depth understanding of bio-degradation of AOCs is crucial for optimizing the design and operation of COW biological treatment systems in practical applications. Herein, the behavior and fate of AOCs were explored in a lab-scale step-feed three-stage integrated A/O biofilter (SFTIAOB) treating synthetic COW. Long-term operation demonstrated that COD, phenol, indole, quinoline and pyridine could be simultaneously removed. Phenol and indole were chiefly removed by anoxic zones, while quinoline and pyridine removal occurred in both anoxic and aerobic zones. Ultraviolet-visible spectrum observed that initial carboxylation and subsequent ring cracking and mineralization. Infrared spectroscopy also confirmed that key functional groups were cracked and produced during AOCs bio-degradation. Three-dimensional fluorescence spectrum indicated that significant transformation and elimination of tryptophan and humic acid with high molecular weight. Ring cleavage, distinct degradation and even complete mineralization of complex AOCs were further verified by gas chromatography-mass spectrometry. Moreover, functional degrading bacteria and aromatic ring-cleavage enzymes was successfully identified. Finally, AOCs biodegradation mechanisms by alternating anoxic and aerobic treatment was unraveled. This research provides thorough insights on AOCs biodegradation using a step-feed multi-stage alternating anoxic/oxic COW treatment process.
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Affiliation(s)
- Zilong Hou
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China; School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China
| | - Xin Zhou
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China.
| | - Zilong Zhao
- School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China
| | - Wenyi Dong
- School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen, 518055, PR China; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Hongjie Wang
- School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen, 518055, PR China; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Huaguang Liu
- School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China
| | - Zhiwei Zeng
- School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China
| | - Jin Xie
- School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China
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Chen G, Liu F, Zhang X, Zhang R, Cheng A, Shi D, Dong J, Liao H. Dissipation rates, residue distribution, degradation products, and degradation pathway of sulfoxaflor in broccoli. Environ Sci Pollut Res Int 2022; 29:59592-59605. [PMID: 35391643 DOI: 10.1007/s11356-022-20037-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 03/29/2022] [Indexed: 06/14/2023]
Abstract
Broccoli was selected as the research object in this paper to reveal the dissipation, distribution, and degradation pathway of sulfoxaflor under greenhouse and open-field cultivation conditions for the ecological risk assessment of sulfoxaflor. Results showed that the dissipation of sulfoxaflor in broccoli leaves, flowers, stems, roots, and the whole broccoli was in accordance with the first-order kinetic equation. The sulfoxaflor concentration in broccoli roots reached the maximum value after 1 day of application and then gradually decreased. The degradation half-lives of sulfoxaflor in the roots, leaves, flowers, stems, and whole broccoli were between 2.3 and 19.8 days. The longest degradation half-life of sulfoxaflor was in Heilongjiang under greenhouse cultivation. The terminal residue of sulfoxaflor in broccoli was in the range of 0.005-0.029 mg/kg, and the proportion of sulfoxaflor residue in broccoli leaves was the largest. Thirteen transformation products were separated and identified by ultrahigh-performance liquid chromatography-quadrupole time-of-flight mass spectrometry, and their kinetic evolution was studied. The cleavage of the N = S bond, C-S bond, C-O bond, and cyanide, as well as glucosylation, hydroxylation, SO extrusion, elimination, sulfhydrylation, ketonization, defluorination, and rearrangement, was inferred as the mechanism. Overall, these results can provide guidance for the supervision of the safe application of sulfoxaflor.
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Affiliation(s)
- Guofeng Chen
- Safety and Quality Institute of Agricultural Products, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China
| | - Feng Liu
- Safety and Quality Institute of Agricultural Products, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China
| | - Xiaobo Zhang
- Safety and Quality Institute of Agricultural Products, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China
| | - Ruiying Zhang
- Safety and Quality Institute of Agricultural Products, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China
| | - Aihua Cheng
- Safety and Quality Institute of Agricultural Products, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China
| | - Dongmei Shi
- Safety and Quality Institute of Agricultural Products, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China
| | - Jiannan Dong
- Safety and Quality Institute of Agricultural Products, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China
| | - Hui Liao
- Safety and Quality Institute of Agricultural Products, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China.
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Puuvuori E, Rokka J, Carlsson PO, Li Z, Eriksson J, Eriksson O. Potential of [ 11C]UCB-J as a PET tracer for islets of Langerhans. Sci Rep 2021; 11:24466. [PMID: 34963683 PMCID: PMC8714818 DOI: 10.1038/s41598-021-04188-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 12/17/2021] [Indexed: 11/11/2022] Open
Abstract
Biomarkers for the measurement of islets of Langerhans could help elucidate the etiology of diabetes. Synaptic vesicle glycoprotein 2 A (SV2A) is a potential marker reported to be localized in the endocrine pancreas. [11C]UCB-J is a novel positron emission tomography (PET) radiotracer that binds to SV2A and was previously evaluated as a synaptic marker in the central nervous system. Here, we evaluated whether [11C]UCB-J could be utilized as a PET tracer for the islets of Langerhans in the pancreas by targeting SV2A. The mRNA transcription of SV2A was evaluated in human isolated islets of Langerhans and exocrine tissue. In vitro autoradiography was performed on pancreas and brain sections from rats and pigs, and consecutive sections were immunostained for insulin. Sprague-Dawley rats were examined with PET-MRI and ex vivo autoradiography at baseline and with administration of levetiracetam (LEV). Similarly, pigs were examined with dynamic PET-CT over the pancreas and brain after administration of [11C]UCB-J at baseline and after pretreatment with LEV. In vivo radioligand binding was assessed using a one-compartment tissue model. The mRNA expression of SV2A was nearly 7 times higher in endocrine tissue than in exocrine tissue (p < 0.01). In vitro autoradiography displayed focal binding of [11C]UCB-J in the pancreas of rats and pigs, but the binding pattern did not overlap with the insulin-positive areas or with ex vivo autoradiography. In rats, pancreas binding was higher than that in negative control tissues but could not be blocked by LEV. In pigs, the pancreas and brain exhibited accumulation of [11C]UCB-J above the negative control tissue spleen. While brain binding could be blocked by pretreatment with LEV, a similar effect was not observed in the pancreas. Transcription data indicate SV2A to be a valid target for imaging islets of Langerhans, but [11C]UCB-J does not appear to have sufficient sensitivity for this application.
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Affiliation(s)
- Emmi Puuvuori
- Science for Life Laboratory, Department of Medicinal Chemistry, Uppsala University, Dag Hammarskjöldsv 14C, 3rd floor, 75183, Uppsala, Sweden.
| | - Johanna Rokka
- Department of Public Health and Caring Sciences, Uppsala University, Uppsala, Sweden
| | - Per-Ola Carlsson
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - Zhanchun Li
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - Jonas Eriksson
- Science for Life Laboratory, Department of Medicinal Chemistry, Uppsala University, Dag Hammarskjöldsv 14C, 3rd floor, 75183, Uppsala, Sweden
| | - Olof Eriksson
- Science for Life Laboratory, Department of Medicinal Chemistry, Uppsala University, Dag Hammarskjöldsv 14C, 3rd floor, 75183, Uppsala, Sweden.
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Liang Y, Wei L, Hu J. Residues and dietary intake risk assessments of clomazone, fomesafen, haloxyfop-methyl and its metabolite haloxyfop in spring soybean field ecosystem. Food Chem 2021; 360:129921. [PMID: 33991974 DOI: 10.1016/j.foodchem.2021.129921] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 03/25/2021] [Accepted: 04/19/2021] [Indexed: 11/30/2022]
Abstract
Soybean is an important oilseed crop, but weed can have a significant effect on soybean yield. Clomazone, fomesafen, and haloxyfop-methyl are high-efficacy herbicides, and the combination of these herbicides shows an ideal effect on weed control. However, the residues of these herbicides and their impacts on human health are still largely unknown. In the current study, a rapid, sensitive, and selective method using modified QuECHERS procedure combined with HPLC-MS/MS was established to detect these herbicides in soybean matrices. The limits of quantification were 0.01, 0.01 and 0.025 mg/kg for haloxyfop-methyl, haloxyfop and fomesafen, and 0.005, 0.005 and 0.0125 mg/kg for clomazone in green soybean, soybean grain, and straw, with the average recoveries ranging from 80% to 107%. The terminal residues of the target compounds were all below the corresponding limits of quantification. The dietary risk assessment showed that the risk quotient values were far below the acceptable human consumption levels.
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Affiliation(s)
- Yiran Liang
- College of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Lan Wei
- College of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Jiye Hu
- College of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
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Dvorácskó S, Lázár L, Fülöp F, Palkó M, Zalán Z, Penke B, Fülöp L, Tömböly C, Bogár F. Novel High Affinity Sigma-1 Receptor Ligands from Minimal Ensemble Docking-Based Virtual Screening. Int J Mol Sci 2021; 22:8112. [PMID: 34360878 PMCID: PMC8347176 DOI: 10.3390/ijms22158112] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Revised: 07/23/2021] [Accepted: 07/26/2021] [Indexed: 02/07/2023] Open
Abstract
Sigma-1 receptor (S1R) is an intracellular, multi-functional, ligand operated protein that also acts as a chaperone. It is considered as a pluripotent drug target in several pathologies. The publication of agonist and antagonist bound receptor structures has paved the way for receptor-based in silico drug design. However, recent studies on this subject payed no attention to the structural differences of agonist and antagonist binding. In this work, we have developed a new ensemble docking-based virtual screening protocol utilizing both agonist and antagonist bound S1R structures. This protocol was used to screen our in-house compound library. The S1R binding affinities of the 40 highest ranked compounds were measured in competitive radioligand binding assays and the sigma-2 receptor (S2R) affinities of the best S1R binders were also determined. This way three novel high affinity S1R ligands were identified and one of them exhibited a notable S1R/S2R selectivity.
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Affiliation(s)
- Szabolcs Dvorácskó
- Biological Research Centre, Institute of Biochemistry, Eötvös Loránd Research Network (ELKH), H-6726 Szeged, Hungary; (S.D.); (C.T.)
| | - László Lázár
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Hungary; (L.L.); (F.F.); (M.P.); (Z.Z.)
| | - Ferenc Fülöp
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Hungary; (L.L.); (F.F.); (M.P.); (Z.Z.)
| | - Márta Palkó
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Hungary; (L.L.); (F.F.); (M.P.); (Z.Z.)
| | - Zita Zalán
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Hungary; (L.L.); (F.F.); (M.P.); (Z.Z.)
| | - Botond Penke
- Department of Medical Chemistry, University of Szeged, H-6720 Szeged, Hungary;
| | - Lívia Fülöp
- Department of Medical Chemistry, University of Szeged, H-6720 Szeged, Hungary;
| | - Csaba Tömböly
- Biological Research Centre, Institute of Biochemistry, Eötvös Loránd Research Network (ELKH), H-6726 Szeged, Hungary; (S.D.); (C.T.)
| | - Ferenc Bogár
- Department of Medical Chemistry, University of Szeged, H-6720 Szeged, Hungary;
- MTA-SZTE Biomimetic Systems Research Group, Eötvös Loránd Research Network (ELKH), H-6720 Szeged, Hungary
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Ma D, Yang S, Jiang J, Zhu J, Li B, Mu W, Dou D, Liu F. Toxicity, residue and risk assessment of tetraniliprole in soil-earthworm microcosms. Ecotoxicol Environ Saf 2021; 213:112061. [PMID: 33636466 DOI: 10.1016/j.ecoenv.2021.112061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 02/09/2021] [Accepted: 02/11/2021] [Indexed: 06/12/2023]
Abstract
Maize seed treatment with chemicals to control underground pests is a common agricultural practice, but inappropriate use of insecticides poses a considerable threat to plant development and soil nontarget organisms. In this study, the availability of tetraniliprole seed dressing to control the black cutworm Agrotis ipsilon (Lepidoptera: Noctuidae) in the maize seeding stage and its safety to earthworms (Eisenia fetida) were investigated. The selective toxicity (ST) of tetraniliprole between E. fetida and A. ipsilon was greater than 4000. No significant adverse effect of tetraniliprole seed treatment on the germination of maize seeds was observed at concentrations of 2.4-9.6 g a.i. /kg seed. Compared with the untreated control, seed treatment with tetraniliprole at 9.6 g a.i. /kg seed greatly reduced the percentage of damaged plants from 88.73% to 26.67%, and achieved the highest control effect of 69.91%. Tetraniliprole of 2.4 g a.i. /kg seed can effectively inhibit A. ipsilon until 14 days after seed germination, with the lowest mortality rate of 44.44%. During the entire exposure period, the maximum residual concentration of tetraniliprole detected in the soil (5.86 mg/kg) was considerably lower than the LC50 value of tetraniliprole to E. fetida (>4000 mg/kg). According to the low-tier risk assessment, the highest risk quotient (RQ) of tetraniliprole seed treatment to earthworms at test concentrations was 2.8 × 10-3, which was evaluated as acceptable. This study provided data support for tetraniliprole seed treatment to control underground pests in maize fields.
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Affiliation(s)
- Dicheng Ma
- College of Plant Protection, China Agricultural University, No. 2, Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Song Yang
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, College of Plant Protection, Shandong Agricultural University, 61 Daizong Street, Tai'an, Shandong 271018, People's Republic of China
| | - Jiangong Jiang
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, College of Plant Protection, Shandong Agricultural University, 61 Daizong Street, Tai'an, Shandong 271018, People's Republic of China
| | - Jiamei Zhu
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, College of Plant Protection, Shandong Agricultural University, 61 Daizong Street, Tai'an, Shandong 271018, People's Republic of China
| | - Beixing Li
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, College of Plant Protection, Shandong Agricultural University, 61 Daizong Street, Tai'an, Shandong 271018, People's Republic of China
| | - Wei Mu
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, College of Plant Protection, Shandong Agricultural University, 61 Daizong Street, Tai'an, Shandong 271018, People's Republic of China
| | - Daolong Dou
- College of Plant Protection, China Agricultural University, No. 2, Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Feng Liu
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, College of Plant Protection, Shandong Agricultural University, 61 Daizong Street, Tai'an, Shandong 271018, People's Republic of China.
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Darwish HW, Ali NA, Naguib IA, El Ghobashy MR, Al-Hossaini AM, Abdelrahman MM. Development and validation of a stability indicating RP-HPLC-DAD method for the determination of bromazepam. PLoS One 2021; 16:e0244951. [PMID: 33690658 PMCID: PMC7946308 DOI: 10.1371/journal.pone.0244951] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 12/19/2020] [Indexed: 11/20/2022] Open
Abstract
A reliable, selective and sensitive stability-indicating RP-HPLC assay was established for the quantitation of bromazepam (BMZ) and one of the degradant and stated potential impurities; 2-(2-amino-5-bromobenzoyl) pyridine (ABP). The assay was accomplished on a C18 column (250 mm × 4.6 mm i.d., 5 μm particle size), and utilizing methanol-water (70: 30, v/v) as the mobile phase, at a flow rate of 1.0 ml min-1. HPLC detection of elute was obtained by a photodiode array detector (DAD) which was set at 230 nm. ICH guidelines were adhered for validation of proposed method regarding specificity, sensitivity, precision, linearity, accuracy, system suitability and robustness. Calibration curves of BMZ and ABP were created in the range of 1-16 μg mL-1 with mean recovery percentage of 100.02 ± 1.245 and 99.74 ± 1.124, and detection limit of 0.20 μg mL-1 and 0.24 μg mL-1 respectively. BMZ stability was inspected under various ICH forced degradation conditions and it was found to be easily degraded in acidic and alkaline conditions. The results revealed the suitability of the described methodology for the quantitation of the impurity (ABP) in a BMZ pure sample. The determination of BMZ in pharmaceutical dosage forms was conducted with the described method and showed mean percentage recovery of 99.39 ± 1.401 and 98.72 ± 1.795 (n = 6), respectively. When comparing the described procedure to a reference HPLC method statistically, no significant differences between the two methods in regard to both accuracy and precision were found.
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Affiliation(s)
- Hany W. Darwish
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, Kingdom of Saudi Arabia
- Faculty of Pharmacy, Analytical Chemistry Department, Cairo University, Cairo, Egypt
| | - Nesma A. Ali
- Analytical Toxicology Laboratory, Forensic Medicine Authority, Justice Ministry, El Sayeda Zeinab, Cairo, Egypt
| | - Ibrahim A. Naguib
- Department of Pharmaceutical Chemistry, College of Pharmacy, Taif University, Taif, Saudi Arabia
| | - Mohamed R. El Ghobashy
- Faculty of Pharmacy, Analytical Chemistry Department, Cairo University, Cairo, Egypt
- Faculty of Pharmacy, October 6 University, October 6 city, Giza, Egypt
| | - Abdullah M. Al-Hossaini
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Maha M. Abdelrahman
- Faculty of Pharmacy, Pharmaceutical Analytical Chemistry Department, Beni-Suef University, Beni-Suef, Egypt
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11
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Ying Y, Cao Z, Li H, He J, Zheng L, Jin M, Wang J. An optimized LC-MS/MS workflow for evaluating storage stability of fluroxypyr and halosulfuron-methyl in maize samples. J Environ Sci Health B 2020; 56:64-72. [PMID: 33236684 DOI: 10.1080/03601234.2020.1838826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Pesticide registration ensures the safety of agricultural products; however, the backlog of field samples often requires lengthy storage periods. Thus, the stability of pesticide residues in stored samples is required information for pesticide registration. We monitored the degradation rates of fluroxypyr and halosulfuron-methyl in maize straw, mature maize grain, and fresh corn matrices to evaluate their storage stability. Analytes were extracted and cleaned up with a modified Quick, Easy, Cheap, Effective, Rugged, and Safe (QuEChERS) method and then detected with liquid chromatography tandem-mass spectrometry. We optimized the workflow by testing different clean-up sorbents, LC columns, and chromatographic methods. The linearity correlation coefficients of fluroxypyr and halosulfuron-methyl in the three matrices were ≥0.994. At three fortification levels, the mean recoveries of fluroxypyr and halosulfuron-methyl were 84.2-114.8% and 83.8-105.5% with relative standard deviations of 2.4-9.4% and 2.7-10.2%, respectively. Degradation of the two herbicides in the three matrices was less than 30% over the 70-day storage period, indicating fluroxypyr and halosulfuron-methyl are stable in the tested maize matrices when stored at -20 °C for at least 70 days. This study provides a reference method for pesticide residue analysis and can be used as a guide to develop accurate and reasonable pesticide registration procedures.
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Affiliation(s)
- Ying Ying
- Institute of Quality Standards & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Agro-product Quality and Safety, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Zhen Cao
- Institute of Quality Standards & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Agro-product Quality and Safety, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Hui Li
- Institute of Quality Standards & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Agro-product Quality and Safety, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Jie He
- Institute of Quality Standards & Testing Technology for Agro-Products, Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Lufei Zheng
- Institute of Quality Standards & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Agro-product Quality and Safety, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Maojun Jin
- Institute of Quality Standards & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Agro-product Quality and Safety, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Jing Wang
- Institute of Quality Standards & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Agro-product Quality and Safety, Ministry of Agriculture and Rural Affairs, Beijing, China
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12
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Li C, Yuan S, Jiang F, Xie Y, Guo Y, Yu H, Cheng Y, Qian H, Yao W. Degradation of fluopyram in water under ozone enhanced microbubbles: Kinetics, degradation products, reaction mechanism, and toxicity evaluation. Chemosphere 2020; 258:127216. [PMID: 32535436 DOI: 10.1016/j.chemosphere.2020.127216] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 05/09/2020] [Accepted: 05/23/2020] [Indexed: 06/11/2023]
Abstract
The degradation of fluopyram (FLP) was investigated under ozone-microbubble treatment (OMBT). Kinetic models were established to study the influence of three treatments: ozonated water, microbubbles (MCB), and OMBT. FLP degraded completely in OMBT, and a clearance rate of 89.8-100% was achievable. Three direct transformation products [product 1 (F1), product 2 (F2), and product 3(F3)] were isolated and identified using a hybrid ion trap-orbitrap mass spectrometer. Moreover, a transformation theory of FLP degradation was developed according to targeted fragmentation, accurate mass measurements, and degradation profiles. These analyses showed that the products originated from a series of chemical reactions involving dechlorination, hydroxyl substitution, cleavage and oxidation, and were further confirmed based on molecular electrostatic potential and molecular orbital theory. In addition, the stability and toxicity of FLP and its transformation products were tested using the Toxicity Estimation Software Tool (T.E.S.T.) and the Ecological Structure Activity Relationships (ECOSAR) program. Products F1, F2 and F3 were found to be toxic substances, but their toxicity to aquatic organisms was lower than that of FLP. However, they were more toxic to rats than FLP, and their physicochemical properties were more stable. Overall, OMBT is a highly effective method for FLP removal during wastewater treatment.
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Affiliation(s)
- Changjian Li
- State Key Laboratory of Food Science and Technology, Jiangnan University, China; School of Food Science and Technology, Jiangnan University, No.1800 Lihu Avenue, Wuxi, Jiangsu Province, 214122, China
| | - Shaofeng Yuan
- State Key Laboratory of Food Science and Technology, Jiangnan University, China; School of Food Science and Technology, Jiangnan University, No.1800 Lihu Avenue, Wuxi, Jiangsu Province, 214122, China
| | - Feng Jiang
- Hubei Provincial Engineering and Technology Research Centre for Food Quality and Safety Test, Hubei Provincial Institute for Food Supervision and Test, Wuhan, Hubei Province, 430075, China
| | - Yunfei Xie
- State Key Laboratory of Food Science and Technology, Jiangnan University, China; School of Food Science and Technology, Jiangnan University, No.1800 Lihu Avenue, Wuxi, Jiangsu Province, 214122, China
| | - Yahui Guo
- State Key Laboratory of Food Science and Technology, Jiangnan University, China; School of Food Science and Technology, Jiangnan University, No.1800 Lihu Avenue, Wuxi, Jiangsu Province, 214122, China
| | - Hang Yu
- State Key Laboratory of Food Science and Technology, Jiangnan University, China; School of Food Science and Technology, Jiangnan University, No.1800 Lihu Avenue, Wuxi, Jiangsu Province, 214122, China
| | - Yuliang Cheng
- State Key Laboratory of Food Science and Technology, Jiangnan University, China; School of Food Science and Technology, Jiangnan University, No.1800 Lihu Avenue, Wuxi, Jiangsu Province, 214122, China
| | - He Qian
- State Key Laboratory of Food Science and Technology, Jiangnan University, China; School of Food Science and Technology, Jiangnan University, No.1800 Lihu Avenue, Wuxi, Jiangsu Province, 214122, China
| | - Weirong Yao
- State Key Laboratory of Food Science and Technology, Jiangnan University, China; School of Food Science and Technology, Jiangnan University, No.1800 Lihu Avenue, Wuxi, Jiangsu Province, 214122, China.
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13
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Liu T, Ding Y, Liu C, Han J, Wang A. UV activation of the pi bond in pyridine for efficient pyridine degradation and mineralization by UV/H 2O 2 treatment. Chemosphere 2020; 258:127208. [PMID: 32544810 DOI: 10.1016/j.chemosphere.2020.127208] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2020] [Revised: 05/18/2020] [Accepted: 05/23/2020] [Indexed: 06/11/2023]
Abstract
Pyridine and organics containing pyridine rings are widely used but persist in the environment and cause toxic pollution. Due to the attraction of the nitrogen atoms to the electrons in the pi bond, the pyridine ring is difficult to oxidize by oxidant. Here, we propose that ultraviolet (UV) irradiation activates the electrons in the pi bond and enables combination with the hydroxyl radical (OH) originating from hydrogen peroxide (H2O2) to eliminate pyridine quickly and mineralize the byproducts. The removal rates of pyridine and total organic carbon (TOC) were compared in different treatments: UV irradiation, UV/H2O2 treatment and Fenton oxidation with different initial pyridine concentrations, pH values and H2O2 concentrations. The UV/H2O2 treatment yielded a higher pyridine removal rate and greater mineralization than the other treatments. The removal rate of pyridine was highest in neutral aqueous solution and H2O2 concentration of 10 mM. At an initial H2O2 concentration of 10 mM, more than 90% of the pyridine was degraded in 10 min, and approximately 70% of the TOC was removed in 60 min. The absorption of UV light at 254 nm by the pi bond of pyridine can accelerate the damage to the stable pyridine structure, especially in the presence of OH. This study provides a promising alternative for the removal and mineralization of pyridine ring-containing materials.
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Affiliation(s)
- Tong Liu
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Yangcheng Ding
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Chengyan Liu
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Jinglong Han
- School of Civil & Environmental Engineering, Harbin Institute of Technology, Shenzhen, 518055, PR China; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China.
| | - Aijie Wang
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; School of Civil & Environmental Engineering, Harbin Institute of Technology, Shenzhen, 518055, PR China.
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14
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Lehner AF, Zyskowski J, Fulton RM, Buchweitz JP. Haloxyfop determination by gas chromatography/tandem mass spectrometry in eggs. Rapid Commun Mass Spectrom 2020; 34:e8895. [PMID: 32662916 DOI: 10.1002/rcm.8895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 07/10/2020] [Accepted: 07/11/2020] [Indexed: 06/11/2023]
Abstract
RATIONALE Haloxyfop is a pre/post-emergence herbicide with known organ toxicities and teratogenic effects in mammals. The European Union Commission on Food Safety has an established maximum residue limit of 10 μg/kg in all agricultural products including eggs. A sensitive highly specific method would be of value in determination of haloxyfop residues in foodstuffs such as eggs. METHODS The Michigan State University Veterinary Diagnostic Lab (MSU VDL) developed a method for the extraction of haloxyfop from eggs based on popular QuEChERS (quick, easy, cheap, effective, rugged, and safe) methodologies, essentially providing acetonitrile extracts following treatment with high ionic strength additives. Extracts derivatized with trimethylsilyl (TMS) groups were examined by gas chromatography/tandem mass spectrometry using developed multiple reaction monitoring (MRM) methodology. RESULTS The MSU VDL received eggs from chickens exposed to 760 μg/kg haloxyfop in flaxseed. Haloxyfop-TMS m/z 374→73 MRM setting enabled quantitation across the 1-50 ppb range in comparison with an ibuprofen MRM transition as internal standard. CONCLUSIONS The determined limit of quantitation was 2.5 ng/g, and the method successfully identified haloxyfop residues in five of six batches of the chicken eggs, with nonzero values ranging from 2.7 to 14.5 ng/g. These values were consistent with flaxseed incorporation into the diet at 4-7% and known excretion into eggs at 2-3% of daily haloxyfop exposure, and establish the utility of the method in identifying regulatory noncompliance and adulteration of food sources.
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Affiliation(s)
- Andreas F Lehner
- Michigan State University Veterinary Diagnostic Laboratory, Toxicology Section, Michigan State University, East Lansing, MI, 48910, USA
| | - Justin Zyskowski
- Michigan State University Veterinary Diagnostic Laboratory, Toxicology Section, Michigan State University, East Lansing, MI, 48910, USA
| | - Richard M Fulton
- Michigan State University Veterinary Diagnostic Laboratory, Anatomic Pathology Section, Michigan State University, East Lansing, MI, 48910, USA
- Michigan State University College of Veterinary Medicine, Department of Pathobiology & Diagnostic Investigation, Michigan State University, East Lansing, MI, 48910, USA
| | - John P Buchweitz
- Michigan State University Veterinary Diagnostic Laboratory, Toxicology Section, Michigan State University, East Lansing, MI, 48910, USA
- Michigan State University College of Veterinary Medicine, Department of Pathobiology & Diagnostic Investigation, Michigan State University, East Lansing, MI, 48910, USA
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15
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Wang S, Hou Z, Liang S, Lu Z. Residue Behavior and Risk Assessment of Rimsulfuron and Quizalofop-P-ethyl in Potato Under Field Conditions. Bull Environ Contam Toxicol 2020; 105:602-606. [PMID: 32978647 DOI: 10.1007/s00128-020-03002-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 09/16/2020] [Indexed: 06/11/2023]
Abstract
A method for simultaneous quantitation of rimsulfuron, quizalofop-P-ethyl and quizalofop-P in potato plant, soil and potato tuber samples was established. The mean recoveries of rimsulfuron, quizalofop-P-ethyl and quizalofop-P in different matrices spiked with them were 81.4%-101.1%, 76.1%-99.0% and 77.4%-106.4% with relative standard deviations (RSDs) of 2.7%-13.3%, 0.9%-5.5%, 1.7%-11.3%, respectively. The open-field trials in China were conducted in potato cultivation system of Changchun and Jinan. The results indicated that the half-lives of rimsulfuron and quizalofop-P-ethyl were 0.04-13.1 days. The residues of quizalofop-P during the harvest time in Jinan soil were < 0.01-0.044 mg kg-1, while there was no residue of target herbicides detected in all other samples. The risk assessment results demonstrated that the risk quotients (RQs) of rimsulfuron and quizalofop-P-ethyl were 7.857 × 10-5 and 8.730 × 10-3, respectively, which exhibited an acceptable dietary risk to Chinese consumers.
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Affiliation(s)
- Shuo Wang
- College of Plant Protection, Jilin Agricultural University, Changchun, 130118, Jilin, PR China
| | - Zhiguang Hou
- College of Plant Protection, Jilin Agricultural University, Changchun, 130118, Jilin, PR China
| | - Shuang Liang
- College of Plant Protection, Jilin Agricultural University, Changchun, 130118, Jilin, PR China
| | - Zhongbin Lu
- College of Plant Protection, Jilin Agricultural University, Changchun, 130118, Jilin, PR China.
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Cai K, Zhao H, Yin R, Lin Y, Lei B, Wang A, Pan W, Cai B, Gao W, Wang F. Chiral determination of nornicotine, anatabine and anabasine in tobacco by achiral gas chromatography with (1S)-(-)-camphanic chloride derivatization: Application to enantiomeric profiling of cultivars and curing processes. J Chromatogr A 2020; 1626:461361. [PMID: 32797840 DOI: 10.1016/j.chroma.2020.461361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 06/01/2020] [Accepted: 06/19/2020] [Indexed: 10/24/2022]
Abstract
The alkaloid enantiomers are well-known to have different physiological and pharmacological effects, and to play an important role in enantioselectivity metabolism with enzymes catalysis in tobacco plants. Here, we developed an improved method for simultaneous and high-precision determination of the individual enantiomers of nornicotine, anatabine and anabasine in four tobacco matrices, based on an achiral gas chromatography-nitrogen phosphorus detector (GCNPD) with commonly available Rtx-200 column using (1S)-(-)-camphanic chloride derivatization. The method development consists of the optimization of extraction and derivatization, screening of achiral column, analysis of the fragmentation mechanisms and evaluation of matrix effect (ME). Under the optimized experimental conditions, the current method exhibited excellent detection capability for the alkaloid enantiomers, with coefficients of determination (R2) > 0.9989 and normality test of residuals P > 0.05 in linear regression parameters. The ME can be neglected for the camphanic derivatives. The limit of detection (LOD) and limit of quantitation (LOQ) ranged from 0.087 to 0.24 μg g - 1 and 0.29 to 0.81 μg g - 1, respectively. The recoveries and within-laboratory relative standard deviations (RSDR) were 94.3%~104.2% and 0.51%~3.89%, respectively. The developed method was successfully applied to determine the enantiomeric profiling of cultivars and curing processes. Tobacco cultivars had a significant impact on the nornicotine, anatabine, anabasine concentration and enantiomeric fraction (EF) of (R)-nornicotine, whereas the only significant change induced by the curing processes was an increase in the EF of (R)-anabasine.
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Affiliation(s)
- Kai Cai
- Guizhou Academy of Tobacco Science, Guiyang 550081, China; College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Huina Zhao
- Guizhou Academy of Tobacco Science, Guiyang 550081, China
| | - Runsheng Yin
- State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 55081, China
| | - Yechun Lin
- Guizhou Academy of Tobacco Science, Guiyang 550081, China
| | - Bo Lei
- Guizhou Academy of Tobacco Science, Guiyang 550081, China
| | - Anping Wang
- Key Laboratory for Information System of Mountainous Area and Protection of Ecological, Environment of Guizhou Province, Guizhou Normal University, Guiyang, Guizhou 550025, China
| | - Wenjie Pan
- Guizhou Academy of Tobacco Science, Guiyang 550081, China
| | - Bin Cai
- Haikou Cigar Research Institute, Hainan Provincial Branch of China National Tobacco Corporation, Haikou 571100, China
| | - Weichang Gao
- Guizhou Academy of Tobacco Science, Guiyang 550081, China.
| | - Feng Wang
- Guizhou Academy of Tobacco Science, Guiyang 550081, China.
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Abstract
A new type of mesoionic insecticide triflumezopyrim is mainly used to control rice planthoppers, leafhoppers, etc. In order to study the uptake and translocation characteristics of this new insecticide in rice (Oryza sativa), a method for the detection of triflumezopyrim in rice, soil, and water was established using liquid-liquid extraction and QuEChERS sample pretreatment combined with liquid chromatography-triple quadrupole tandem mass spectrometry. The distribution of triflumezopyrim in rice was investigated after hydroponic treatment and foliar treatment at the concentrations of 2.5 and 5 mg·L-1 within the ranges of 24, 48, and 72 h. The results showed that triflumezopyrim could be absorbed by roots and form a systematic distribution in rice by hydroponic treatment; meanwhile, it could also be absorbed by leaves and transported to the bottom leaves under foliar treatment, but no triflumezopyrim was detected in the roots. Thus, triflumezopyrim exhibited high acropetal translocation within the rice plant. This study provides an important scientific basis for the development of an application strategy of triflumezopyrim to control planthoppers and leafhoppers as well as for the residue detection method and safety evaluation.
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Affiliation(s)
- Tianle Fan
- School of Horticulture and Plant Protection, Yangzhou University/Joint International Research Laboratory of Agriculture & Agri-Product Safety (Yangzhou University), Yangzhou 225009, Jiangsu, People's Republic of China
| | - Xiaojun Chen
- School of Horticulture and Plant Protection, Yangzhou University/Joint International Research Laboratory of Agriculture & Agri-Product Safety (Yangzhou University), Yangzhou 225009, Jiangsu, People's Republic of China
| | - Zhiying Xu
- Yangzhou Polytechnic University, Yangzhou 225001, Jiangsu, People's Republic of China
| | - Li Liu
- School of Guangling, Yangzhou University, Yangzhou 225100, Jiangsu, People's Republic of China
| | - Dianjing Shen
- School of Horticulture and Plant Protection, Yangzhou University/Joint International Research Laboratory of Agriculture & Agri-Product Safety (Yangzhou University), Yangzhou 225009, Jiangsu, People's Republic of China
| | - Sa Dong
- School of Horticulture and Plant Protection, Yangzhou University/Joint International Research Laboratory of Agriculture & Agri-Product Safety (Yangzhou University), Yangzhou 225009, Jiangsu, People's Republic of China
| | - Qingxia Zhang
- School of Horticulture and Plant Protection, Yangzhou University/Joint International Research Laboratory of Agriculture & Agri-Product Safety (Yangzhou University), Yangzhou 225009, Jiangsu, People's Republic of China
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Pérez-Lucas G, Vela N, Abellán M, Fenoll J, Navarro S. Use of Index-Based Screening Models to Evaluate the Leaching of Triclopyr and Fluroxypyr Through a Loam Soil Amended with Vermicompost. Bull Environ Contam Toxicol 2020; 104:497-502. [PMID: 32152685 DOI: 10.1007/s00128-020-02818-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 02/27/2020] [Indexed: 05/25/2023]
Abstract
The effect of vermicompost added to a loam soil on the leaching behaviour of two herbicides (triclopyr and fluroxypyr) was examined. Mobility of the herbicides was assessed using disturbed soil columns under laboratory conditions. In both cases, the addition of vermicompost significantly increased the sorption of the compounds. For both, DT50 values were slightly higher in the amended soil, due to the increased adsorption. Rate constants (k) calculated according to pseudo-first order model were significantly lower in the case of triclopyr (very persistent), which led to a much lower degradation rate compared to fluroxypyr (persistent) in both unamended and amended soils. Values calculated for the experimental leaching index (ELI) in unamended and amended soils showed medium and high leachability for fluroxypyr (0.31 and 0.29) and triclopyr (0.72 and 0.70), respectively. Other index-based screening models (GUS, RLPI, LIX) also catalogue both herbicides as potential leachers. Results confirm that triclopyr and fluroxypyr may contaminate groundwater resources.
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Affiliation(s)
- Gabriel Pérez-Lucas
- Department of Agricultural Chemistry, Geology and Pedology, University of Murcia, Murcia, Spain.
| | - Nuria Vela
- Applied Technology Group To Environmental Health, Catholic University of Murcia, Murcia, Spain
| | - Mercedes Abellán
- Department of Agricultural Chemistry, Geology and Pedology, University of Murcia, Murcia, Spain
| | - José Fenoll
- Sustainability and Quality Group of Fruit and Vegetable Products, Murcia Institute of Agri-Food Research and Development, Murcia, Spain
| | - Simón Navarro
- Department of Agricultural Chemistry, Geology and Pedology, University of Murcia, Murcia, Spain
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Regella VRPS, Subramanian VC, Bhetanabhotla SS. Identification and structural characterization of four novel degradation products and a process impurity of isavuconazonium sulfate for injection formulation bulk by LC-ESI-QTOF-MS/MS. Eur J Mass Spectrom (Chichester) 2020; 26:144-152. [PMID: 31707848 DOI: 10.1177/1469066719884402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Isavuconazonium sulfate is a highly water-soluble pro-drug of active triazole isavuconazole. The degradation profile of isavuconazonium sulfate for injection formulation bulk under acid hydrolysis, alkaline hydrolysis, oxidation, heat, and light conditions was studied using LC-PDA/MS technique. Four degradation products (DP1 to DP4) and one process impurity (PI1) were identified in isavuconazonium sulfate formulation bulk and characterized the identified impurities by liquid chromatography-electron spray ionization-quadruple-time of flight tandem mass spectrometry. Isavuconazole (DP1) was found to be one of the major degradation products of isavuconazonium sulfate.
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Yadav K, Dhiman S, Acharya BN, Ghorpade RR, Sukumaran D. Pyriproxyfen treated surface exposure exhibits reproductive disruption in dengue vector Aedes aegypti. PLoS Negl Trop Dis 2019; 13:e0007842. [PMID: 31738760 PMCID: PMC6886876 DOI: 10.1371/journal.pntd.0007842] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 12/02/2019] [Accepted: 10/13/2019] [Indexed: 11/21/2022] Open
Abstract
Background Reduced susceptibility of mosquito vectors to currently used insecticides hampers control interventions. Recently pyriproxyfen, an insect growth regulator has been demonstrated to effectively reduce the reproductive potential in vector mosquitoes. Methods Pyriproxyfen (PPF), in different concentrations (0.75%, 0.075%, 0.0075%, and 0.00075%) was applied on papers and Indian wild type Aedes aegypti female mosquitoes (N ≥ 20 for each treatment) were exposed onto it as per WHO guidelines, to study the reproductive disruption. PPF concentration on treated papers was quantitatively cross-determined using HPLC method. Reduction in fecundity, fertility and adult emergence in exposed female Ae. aegypti was determined. Abnormal development in ovary and eggs of exposed females was studied microscopically after different time intervals. Results Eggs laid, eggs hatched, pupae formed and adults emerged per female exposed in both before blood meal and after blood meal groups declined significantly from lowest to highest concentration of PPF (F ≥ 5.2; p < 0.02). Adult emergence inhibition in females exposed to PPF before and after blood meal groups ranged from 58.8% [OR = 0.18 (95% CI = 0.09–0.36)] to 79.2% [OR = 0.04 (95% CI = 0.02–0.10)] and 64.4% [OR = 0.12 (95% CI = 0.05–0.28)] to 77.1% [OR = 0.05 (95% CI = 0.02–0.14)] respectively in different concentrations. The probit model used suggested that FI50 (50% fertility inhibition) and EI50 (50% emergence inhibition) were 0.002% (p = 0.82) and 0.0001% (p = 0.99) for females exposed before blood meal, while 0.01% (p = 0.63) and <0.0001% (p = 0.98) for the females exposed after blood meal, respectively. The eggs laid by the females exposed to PPF-treated surface showed altered body organization, desegmentation and disoriented abdominal and cervical regions in the developing embryo. Quantification of PPF on impregnated papers showed that it was uniformly distributed throughout the matrix. Conclusions The present study has shown that tarsal contact to PPF-treated surface for a small time drastically influenced the fecundity, fertility and adult emergence in Indian wild Ae. aegypti mosquitoes. Results suggest that a certain minimum concentration of PPF through contact exposure can reduce the abundance of vector mosquitoes to a considerable level. The formulations based on combination of PPF and other compatible insecticides may be an impactful approach where susceptible mosquitoes are killed by the insecticide component while resistant mosquitoes are sterilised by PPF. Development of resistance against insecticides has challenged mosquito control programmes globally and prompted the research of alternative options that can complement insecticides. An insect growth regulator, pyriproxyfen (PPF) usage against mosquitoes can effectively reduce the vector population. PPF mainly inhibits the metamorphosis of mosquito larvae into pupae and prevent the adult emergence, therefore it is generally applied in mosquito breeding habitats. PPF has been shown to exhibit delayed residual effect that may impair the reproductive capacity by affecting the survival, fecundity and fertility of adult mosquito exposed through tarsal contact. Presently, the effectiveness of different concentrations of PPF intended to be delivered through contact have been evaluated against dengue vector Ae. aegypti. Results suggested that very low PPF concentration treated surfaces drastically reduce the fecundity, fertility and adult emergence in mosquitoes. Study suggests that control interventions based on PPF-treated surfaces could provide an additional route to target mosquito vector control by overall population density reduction.
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Affiliation(s)
- Kavita Yadav
- Vector Management Division, Defence Research and Development Establishment, Gwalior, Madhya Pradesh, India
- * E-mail:
| | - Sunil Dhiman
- Vector Management Division, Defence Research and Development Establishment, Gwalior, Madhya Pradesh, India
| | - BN Acharya
- Synthetic Chemistry Division, Defence Research and Development Establishment, Gwalior, Madhya Pradesh, India
| | - Rama Rao Ghorpade
- Synthetic Chemistry Division, Defence Research and Development Establishment, Gwalior, Madhya Pradesh, India
| | - Devanathan Sukumaran
- Vector Management Division, Defence Research and Development Establishment, Gwalior, Madhya Pradesh, India
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Günay K, Arslan M, Bozkaya O, Aluç Y, Gök ZG. Elimination of carcinogenic bromate ions from aqueous environment with 4-vinyl pyridine-g-poly(ethylene terephthalate) fibers. Environ Sci Pollut Res Int 2019; 26:31644-31653. [PMID: 31485943 DOI: 10.1007/s11356-019-06316-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Accepted: 08/26/2019] [Indexed: 06/10/2023]
Abstract
In this study, poly(ethylene terephthalate) fibers grafted with 4-vinyl pyridine (PET-g-4VP) was synthesized with using a radical polymerization method and its removal capacity for bromate ions in the aqueous solution was explored. The synthesized graft copolymer was structurally characterized by scanning electron microscopy (SEM) and Fourier transformed infrared spectroscopy (FTIR). The effect of some parameters such as pH, grafting rate, processing time, and ion concentration on bromate removal was examined with batch experiments. The sorptions of bromate onto the PET-g-4VP fibers were both verified with FTIR and X-ray fluorescence analysis (XRF) and the remaining amount of bromate after adsorption process was determined with an ion chromatography (Shimadzu). Moreover, kinetic and isotherm studies were also performed for adsorption of bromate with the grafted fibers. The point of zero charge (pHpzc) of the PET-g-4VP fibers was found to be 7.5 and the fibers removed maximum amount of bromate from aqueous solution at pH 3. Equilibrium time of adsorption was determined to be 75 min and the adsorption kinetic was found to be pseudo-second-order model. It was observed that the increase in the amount of grafted 4VP onto the PET fibers increased the bromate removal capacity of the fibers; however, when the grafting yield of 4VP was over 80%, the bromate removal ability of the fibers decreased. The maximum bromate removal capacity of the PET-g-4VP was determined to be 183 mg/g when the initial bromate amount was 800 mg/L, treatment time was 75 min, pH of the solution was 3, and 4VP grafting yield was 80%. When the initial bromate concentration was higher than 800 mg/L, the removal rate of the PET-g-4VP fibers was not changed. In addition, bromate ion adsorption data indicated compliance with the Freundlich isotherm. The adsorbent fibers obtained by this study may be promising candidates for the removal of bromate ions from the aqueous media.
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Affiliation(s)
- Kübra Günay
- Institute of Science, Kırıkkale University, Yahsihan, Kirikkale, Turkey
| | - Metin Arslan
- Chemistry and Chemical Processing Technologies Department, Kırıkkale Vocational High School, Kırıkkale University, Yahsihan, Kirikkale, Turkey
| | - Ogün Bozkaya
- Kırıkkale University Scientific and Technological Research Application and Research Center, Yahsihan, Kırıkkale, Turkey
| | - Yaşar Aluç
- Kırıkkale University Scientific and Technological Research Application and Research Center, Yahsihan, Kırıkkale, Turkey
| | - Zehra Gün Gök
- Department of Bioengineering, Kırıkkale University, Yahsihan, Kırıkkale, Turkey.
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Li W, Zhang Y, Jia H, Zhou W, Li B, Huang H. Adsorption-Desorption and Leaching Behaviors of Tetraniliprole in Three Typical Soils of China. Bull Environ Contam Toxicol 2019; 103:623-629. [PMID: 31428842 DOI: 10.1007/s00128-019-02688-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 08/06/2019] [Indexed: 06/10/2023]
Abstract
Tetraniliprole (TTP) is a new bisimide-based insecticide. Three typical surface soil samples were collected in farmland across China, including Jiangxi red soil (RS), Shandong yellow brown soil (YBS), and Heilongjiang black soil (BS). Adsorption, desorption and leaching experiments were conducted by using equilibrium oscillation and soil column leaching methods at 25°C ± 1°C. The isothermal adsorption and desorption curves of TTP in the above three soils were in accordance with the Freundlich model. The adsorption/desorption constants (Kads-f/Kdes-f) were 41.96-64.48 and 3.62-43.65, respectively. There is a certain hysteresis in the desorption curve, and the hysteresis coefficient (H) was between 0.14 and 0.89. Besides, the leaching properties of TTP in three soils were different. The leaching of TTP in RS and YBS was easy, while difficult for BS. It is concluded that the different adsorption-desorption ability and leaching ability of TTP in the above three soils was attributed to the distinct contents of organic matter (OM) and cation exchange capacity (CEC) in soil.
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Affiliation(s)
- Wei Li
- School of Land Resources and Environment, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Yue Zhang
- School of Land Resources and Environment, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Haoran Jia
- School of Land Resources and Environment, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Wenwen Zhou
- School of Food, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Baotong Li
- School of Land Resources and Environment, Jiangxi Agricultural University, Nanchang, 330045, China.
- Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Agricultural University, Nanchang, 330045, China.
| | - Huajun Huang
- School of Land Resources and Environment, Jiangxi Agricultural University, Nanchang, 330045, China
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Yu Y, Zhao S, Yang Y, Chen Y, Qiu D, Ran X, Lu P, Hu D. Simultaneous Determination of Rimsulfuron and Haloxyfop-P-methyl and Its Metabolite Haloxyfop in Tobacco Leaf by LC-MS/MS. J AOAC Int 2019; 102:1632-1640. [PMID: 30674371 DOI: 10.5740/jaoacint.18-0280] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Background: Tobacco (Nicotiana tabacum L.), is an important economic crop. In China, the use of rimsulfuron and haloxyfop-P-methyl herbicides for weed management during the planting period is necessary to improve the production of tobacco. Objective: To establish and validate a quick, easy, cheap, effective, rugged, and safe LC-MS/MS method to determine rimsulfuron, haloxyfop-P-methyl, and haloxyfop in tobacco leaf samples. Methods: We optimized MS/MS conditions and chromatographic conditions for optimal detection conditions. The extraction solvent and sorbent were optimized, and the analysis of variance was applied to analyze the pretreatment method to obtain the optimal pretreatment conditions. Results: The validation results showed that the proposed method exhibited good linearity (R² > 0.9978), satisfactory recovery (72.51-101.60%) and low LOQ (0.02-1.00 mg/kg). The matrix effects of the three analytes in the two tobacco leaf matrixes were different. The dissipation results showed that the half-lives of rimsulfuron and haloxyfop-P-methyl in fresh tobacco leaf samples were ranged from 2.4 to 3.7 days. The final residues of rimsulfuron, haloxyfop-P-methyl, and haloxyfop in flue-cured tobacco leaf samples were all lower than the LOQ. Conclusions: The results demonstrate that the developed method could be used to detect rimsulfuron, haloxyfop-P-methyl, and haloxyfop in tobacco leaf matrixes. Highlights: A method for simultaneous determination of rimsulfuron, haloxyfop-P-methyl, and haloxyfop in tobacco leaf samples with high sensitivity has been established for the first time.
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Affiliation(s)
- Yurong Yu
- Guizhou University, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guiyang, People's Republic of China 550025
| | - Shan Zhao
- Guizhou University, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guiyang, People's Republic of China 550025
| | - Ya Yang
- Guizhou University, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guiyang, People's Republic of China 550025
| | - Ya Chen
- Guizhou University, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guiyang, People's Republic of China 550025
| | - Daimei Qiu
- Agriculture and Animal Husbandry Bureau of Dafang, Dafang 551600, People's Republic of China
| | - Xingyue Ran
- Agriculture and Animal Husbandry Bureau of Dafang, Dafang 551600, People's Republic of China
| | - Ping Lu
- Guizhou University, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guiyang, People's Republic of China 550025
| | - Deyu Hu
- Guizhou University, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guiyang, People's Republic of China 550025
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Pinto CF, Torrico-Bazoberry D, Penna M, Cossio-Rodríguez R, Cocroft R, Appel H, Niemeyer HM. Chemical Responses of Nicotiana tabacum (Solanaceae) Induced by Vibrational Signals of a Generalist Herbivore. J Chem Ecol 2019; 45:708-714. [PMID: 31313135 DOI: 10.1007/s10886-019-01089-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2018] [Revised: 07/01/2019] [Accepted: 07/07/2019] [Indexed: 12/26/2022]
Abstract
Plants are able to sense their environment and respond appropriately to different stimuli. Vibrational signals (VS) are one of the most widespread yet understudied ways of communication between organisms. Recent research into the perception of VS by plants showed that they are ecologically meaningful signals involved in different interactions of plants with biotic and abiotic agents. We studied changes in the concentration of alkaloids in tobacco plants induced by VS produced by Phthorimaea operculella (Lepidoptera: Gelechiidae), a generalist caterpillar that naturally feeds on the plant. We measured the concentration of nicotine, nornicotine, anabasine and anatabine in four treatments applied to 11-weeks old tobacco plant: a) Co = undamaged plants, b) Eq = Playback equipment attached to the plant without VS, c) Ca = Plants attacked by P. operculella herbivory and d) Pl = playback of VS of P. operculella feeding on tobacco. We found that nicotine, the most abundant alkaloid, increased more than 2.6 times in the Ca and Pl treatments as compared with the Co and Eq treatments, which were similar between them. Nornicotine, anabasine and anatabine were mutually correlated and showed similar concentration patterns, being higher in the Eq treatment. Results are discussed in terms of the adaptive significance of plant responses to ecologically important VS stimuli.
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Affiliation(s)
- Carlos F Pinto
- Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | | | - M Penna
- Programa de Fisiología y Biofísica, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | | | - R Cocroft
- Division of Biological Sciences, University of Missouri, Columbia, MO, 65211, USA
| | - H Appel
- Department of Environmental Sciences, University of Toledo, Toledo, OH, 43606, USA
| | - H M Niemeyer
- Facultad de Ciencias, Universidad de Chile, Santiago, Chile.
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Martínez-Chávez A, Rosing H, Hillebrand M, Tibben M, Schinkel AH, Beijnen JH. Development and validation of a bioanalytical method for the quantification of the CDK4/6 inhibitors abemaciclib, palbociclib, and ribociclib in human and mouse matrices using liquid chromatography-tandem mass spectrometry. Anal Bioanal Chem 2019; 411:5331-5345. [PMID: 31209549 PMCID: PMC6647725 DOI: 10.1007/s00216-019-01932-w] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 05/13/2019] [Indexed: 12/27/2022]
Abstract
A novel method was developed and validated for the quantification of the three approved CDK4/6 inhibitors (abemaciclib, palbociclib, and ribociclib) in both human and mouse plasma and mouse tissue homogenates (liver, kidney, spleen, brain, and small intestine) using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). For all matrices, pretreatment was performed using 50 μL of sample by protein precipitation with acetonitrile, followed by dilution of the supernatant. Chromatographic separation of the analytes was done on a C18 column using gradient elution. A full validation was performed for human plasma, while a partial validation was executed for mouse plasma and mouse tissue homogenates. The method was linear in the calibration range from 2 to 200 ng/mL, with a correlation coefficient (r) ≥0.996 for each analyte. For both human and mouse plasma, the accuracy and precision were within ±15% and ≤15%, respectively, for all concentrations, except for the lower limit of quantification, where they were within ±20% and ≤20%, respectively. A fit-for-purpose strategy was followed for tissue homogenates, and the accuracy and precision were within ±20% and ≤20%, respectively, for all concentrations. Stability of all analytes in all matrices at different processing and storage conditions was tested; ribociclib and palbociclib were unstable in most tissue homogenates and conditions were modified to increase the stability. The method was successfully applied for the analysis of mouse samples from preclinical studies. A new ribociclib metabolite was detected in mouse plasma samples with the same m/z transition as the parent drug.
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Affiliation(s)
- Alejandra Martínez-Chávez
- Department of Pharmacy & Pharmacology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, The Netherlands.
- Division of Pharmacology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, The Netherlands.
| | - Hilde Rosing
- Department of Pharmacy & Pharmacology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, The Netherlands
| | - Michel Hillebrand
- Department of Pharmacy & Pharmacology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, The Netherlands
| | - Matthijs Tibben
- Department of Pharmacy & Pharmacology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, The Netherlands
| | - Alfred H Schinkel
- Division of Pharmacology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, The Netherlands
| | - Jos H Beijnen
- Department of Pharmacy & Pharmacology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, The Netherlands
- Division of Pharmacology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, The Netherlands
- Division of Pharmacoepidemiology and Clinical Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, David de Wied building, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands
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Abstract
An electron paramagnetic resonance (EPR) method was used to determine the concentration of the antitumor agent Triapine in BEAS-2B cells when Triapine was bound to iron (Fe). Knowledge of the concentration of Fe-Triapine in tumor cells may be useful to adjust the administration of the drug or to adjust iron uptake in tumor cells. An EPR spectrum is obtained for Fe(3+)-Triapine, Fe(3+)(Tp)2+, in BEAS-2B cells after addition of Fe(3+)(Tp)2+. Detection of the low spin signal for Fe(3+)(Tp)2+ shows that the Fe(3+)(Tp)2+ complex is intact in these cells. It is proposed that Triapine acquires iron from transferrin in cells including tumor cells. Here, it is shown that iron from purified Fe-transferrin is transferred to Triapine after the addition of ascorbate. To our knowledge, this is the first time that the EPR method has been used to determine the concentration of an iron antitumor agent in cells.
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Affiliation(s)
- William E Antholine
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, WI 53226, USA.
| | - Charles R Myers
- Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, WI 53226, USA.
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Abstract
Droplet microfluidics enables high-throughput manipulation of fL-μL volume samples. Methods implemented for the chemical analysis of microfluidic droplets have been limited in scope, leaving some applications of droplet microfluidics difficult to perform or out of reach entirely. Nanoelectrospray ionization-mass spectrometry (nESI-MS) is an attractive approach for droplet analysis, because it allows rapid, label-free, information-rich analysis with high mass sensitivity and resistance to matrix effects. Previous proof-of-concept systems for the nESI-MS analysis of droplets have been limited by the microfluidics used so that stable, long-term operation needed for high-throughput applications has not been demonstrated. We describe a platform for the stable analysis of microfluidic droplet samples by nESI-MS. Continuous infusion of droplets to an nESI emitter was demonstrated for as long as 2.5 h, corresponding to analysis of over 20 000 samples. Stable signal was observed for droplets as small as 65 pL and for throughputs as high as 10 droplets/s. A linear-concentration-based response and sample-to-sample carryover of <3% were also shown. The system is demonstrated for measuring products of in-droplet enzymatic reactions.
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Affiliation(s)
- Daniel J Steyer
- Department of Chemistry , University of Michigan , 930 N. University Avenue , Ann Arbor , Michigan 48109 , United States
| | - Robert T Kennedy
- Department of Chemistry , University of Michigan , 930 N. University Avenue , Ann Arbor , Michigan 48109 , United States
- Department of Pharmacology , University of Michigan , 1150 W. Medical Center Drive , Ann Arbor , Michigan 48109 , United States
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Gao X, Du X, An L, Wang Y, Wang L, Wu Z, Huang C, He X. Wilforine, the Q-marker and PK-maker of Tripterygium glycosides tablet: Based on preparation quantitative analysis and PK-PD study. Phytomedicine 2019; 54:357-364. [PMID: 30318152 DOI: 10.1016/j.phymed.2018.03.031] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 12/25/2017] [Accepted: 03/17/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND The quality standard of Tripterygium glycosides tablet (TGT) by CFDA can not fully reflect the effectiveness and safety. While, Q-marker was proposed to solve the problem of traditional Chinese medicine. PK-marker is mainly used to reflect the material exposure and the influencing factors of Chinese medicine after administration. PURPOSE Based on the study of quantitative analysis, cytotoxicity and pharmacokinetics, this study screened out and confirmed whether wilforine could be served as a potential Q-marker and PK-marker of TGT. METHODS A sensitive and selective UPLC-MS/MS method was developed and applied to quantitative research of TGT preparation and pharmacokinetics study of TGT. Then, HepG2 cells assay was used to evaluate the cytotoxicity induced by alkaloids in TGT. Then, a PK-PD research was carried out in adjuvant arthritis (AA) rats and control rats after oral administration of TGT, with different dosage and timing. The pharmacokinetic characteristics were determined and calculated by DAS1.0. The pharmacodynamics of TGT was evaluated by the change of paw swelling through one-way ANOVA analysis. RESULTS The quality of four alkaloids showed significant difference among four manufacturers, and they were abundant component in TGT from three manufacturers of all. HepG2 cells test revealed that wilforine and wilforgine could induce the cytotoxicity obviously. Pharmacodynamics index suggested that TGT had therapeutic effect on adjuvant arthritis. Thus, the four cases of death occurred in the high dose AA rat group had proven the significant toxicity caused by continuous high dose TGT administration. Furthermore, the result of pharmacokinetic study proved that Cmax, and AUC(0-tn) of wilforine have dose-dependent and time-dependent characteristics. But for wilforgine, there was no indication that there was an accumulation phenomenon in vivo and its plasma concentration showed low exposure. Therefore, it could hardly become the PK-marker of TGT. CONCLUSION Wilforine is proposed as a biologically active and toxic component of TGT that can be served both as Q-marker and PK-marker. The quality, clinical safety, and efficacy of TGT should be evaluated by the quality of wilforine.
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Affiliation(s)
- Xue Gao
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Nankai District, Tianjin 300193, PR China
| | - Xi Du
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Nankai District, Tianjin 300193, PR China; Second Affiliated Hospital of Tianjin University of TCM, Tianjin 300150, PR China
| | - Lijun An
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Nankai District, Tianjin 300193, PR China
| | - Yangyang Wang
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Nankai District, Tianjin 300193, PR China
| | - Lili Wang
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Nankai District, Tianjin 300193, PR China
| | - Zengguang Wu
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Nankai District, Tianjin 300193, PR China
| | - Cong Huang
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Nankai District, Tianjin 300193, PR China
| | - Xin He
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Nankai District, Tianjin 300193, PR China; Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin 300193, PR China.
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Matadha NY, Mohapatra S, Siddamallaiah L, Udupi VR, Gadigeppa S, Raja DP. Uptake and distribution of fluopyram and tebuconazole residues in tomato and bell pepper plant tissues. Environ Sci Pollut Res Int 2019; 26:6077-6086. [PMID: 30613891 DOI: 10.1007/s11356-018-04071-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 12/27/2018] [Indexed: 06/09/2023]
Abstract
The present study describes the uptake and distribution of fungicides, fluopyram, and tebuconazole in tomato and bell pepper plant tissues from the soil drench application of their combination product fluopyram17.7% + tebuconazole 17.7%. For extraction and cleanup of fluopyram, its metabolite fluopyram benzamide, and tebuconazole samples, the QuEChERS method was used in conjunction with LC-MS/MS. The limit of detection (LOD) and limit of quantification (LOQ) of the method determined were 1.5 μg kg-1 and 0.005 mg kg-1, respectively, and recoveries of all analytes from sample matrices remained within the acceptable range of 70-120%. Rapid uptake of the fungicides by tomato and bell pepper plants was observed from the first day onwards. In the tomato plant, the major part of the fungicides accumulated in the roots, whereas in bell pepper plant, it accumulated both in the roots and in the leaves. Accumulation of fluopyram and tebuconazole residues was lowest in tomato and bell pepper fruits which were much below their respective maximum residue limits (MRLs). The highest residue concentration of fluopyram and tebuconazole in tomato fruits was 0.060 and 0.009 mg kg-1; the corresponding values in bell pepper fruits were 0.080 and 0.013 mg kg-1. In field soil, fluopyram residues were 3.18-3.570 mg kg-1 initially which dissipated at the half-life of 36 days. Tebuconazole concentration was 1.57-1.892 mg kg-1 initially, and it dissipated at the half-life of 44.5-49.5 days. The major metabolite of fluopyram, fluopyram benzamide, was detected in plant tissues as well as in soil, and remained within 12% of the parent compound. The results of the study indicated that fluopyram and tebuconazole are less likely of entry into food chain through intake of tomato and bell pepper fruits if these crops are grown on soil contaminated with these fungicides.
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Affiliation(s)
- Nagapooja Yogendraiah Matadha
- Pesticide Residue Laboratory, ICAR-Indian Institute of Horticultural Research, Hesaraghatta Lake, Bangalore, 560089, India
- Department of chemistry, Center for Nano and Material Science, Jain University, Jakkasandra, Kanakpura, Bangalore, 562112, India
| | - Soudamini Mohapatra
- Pesticide Residue Laboratory, ICAR-Indian Institute of Horticultural Research, Hesaraghatta Lake, Bangalore, 560089, India.
| | - Lekha Siddamallaiah
- Pesticide Residue Laboratory, ICAR-Indian Institute of Horticultural Research, Hesaraghatta Lake, Bangalore, 560089, India
| | - Veena Rao Udupi
- Pesticide Residue Laboratory, ICAR-Indian Institute of Horticultural Research, Hesaraghatta Lake, Bangalore, 560089, India
| | - Shambulinga Gadigeppa
- Pesticide Residue Laboratory, ICAR-Indian Institute of Horticultural Research, Hesaraghatta Lake, Bangalore, 560089, India
| | - Danish Poothotathil Raja
- Pesticide Residue Laboratory, ICAR-Indian Institute of Horticultural Research, Hesaraghatta Lake, Bangalore, 560089, India
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Bordonali L, Nordin N, Fuhrer E, MacKinnon N, Korvink JG. Parahydrogen based NMR hyperpolarisation goes micro: an alveolus for small molecule chemosensing. Lab Chip 2019; 19:503-512. [PMID: 30627714 PMCID: PMC6369676 DOI: 10.1039/c8lc01259h] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Complex mixtures, commonly encountered in metabolomics and food analytics, are now routinely measured by nuclear magnetic resonance (NMR) spectroscopy. Since many samples must be measured, one-dimensional proton (1D 1H) spectroscopy is the experiment of choice. A common challenge in complex mixture 1H NMR spectroscopy is spectral crowding, which limits the assignment of molecular components to those molecules in relatively high abundance. This limitation is exacerbated when the sample quantity itself is limited and concentrations are reduced even further during sample preparation for routine measurement. To address these challenges, we report a novel microfluidic NMR platform integrating signal enhancement via parahydrogen induced hyperpolarisation. The platform simultaneously addresses the challenges of handling small sample quantities through microfluidics, the associated decrease in signal given the reduced sample quantity by Signal Amplification by Reversible Exchange (SABRE), and overcoming spectral crowding by taking advantage of the chemosensing aspect of the SABRE effect. SABRE at the microscale is enabled by an integrated PDMS membrane alveolus, which provides bubble-free hydrogen gas contact with the sample solution. With this platform, we demonstrate high field NMR chemosensing of microliter sample volumes, nanoliter detection volumes, and micromolar concentrations corresponding to picomole molecular sensitivity.
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Affiliation(s)
- Lorenzo Bordonali
- Institute for Microtechnology, Karlsruhe Institute for Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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Tu LH, Boulange J, Iwafune T, Yadav IC, Watanabe H. Improvement and application of the PCPF-1@SWAT2012 model for predicting pesticide transport: a case study of the Sakura River watershed. Pest Manag Sci 2018; 74:2520-2529. [PMID: 29656603 DOI: 10.1002/ps.4934] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 03/27/2018] [Accepted: 04/15/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND The Soil and Water Assessment Tool combined with Pesticide Concentration in Paddy Field (PCPF-1@SWAT) model was previously developed to simulate the fate and transport of rice pesticides in watersheds. However, the current model is deficient in characterizing the rice paddy area and is incompatible with the ArcSWAT2012 program. In this study, we modified the original PCPF-1@SWAT model to develop a new PCPF-1@SWAT2012 model to address the deficiency in the rice paddy area and utilizing the ArcSWAT2012 program. Next, the new model was applied to the Sakura River watershed, Ibaraki, Japan in order to simulate the transport of four herbicides: mefenacet, pretilachlor, bensulfuron-methyl and imazosulfuron. RESULTS The results showed that the water flow rate simulated by PCPF1@SWAT2012 was similar with the observed data. The calculated Nash-Sutcliffe efficiency coefficient (NSE) (0.73) and percent bias (PBIAS) (-20.38) suggested satisfactory performance of the model. In addition, the concentrations of herbicides simulated by the PCPF-1@SWAT2012 model were in good agreement with the observed data. The statistical indices NSE and root mean square error (RMSE) estimated for mefenacet (0.69 and 0.18, respectively), pretilachlor (0.86 and 0.18, respectively), bensulfuronmethyl (0.46 and 0.21, respectively) and imazosulfuron (0.64 and 0.28, respectively) indicated satisfactory predictions. CONCLUSION The PCPF-1@SWAT2012 model is capable of simulating well the water flow rate and transport of herbicides in this watershed, comprising different land use types, including a rice paddy area. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Le Hoang Tu
- Department of Agricultural and Environmental Engineering, United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Tokyo, Japan
- Research Center of Climate Change, Nong Lam University, HoChiMinh, Vietnam
| | - Julien Boulange
- Center for Global Environmental Research, National Institute for Environmental Science, Tsukuba, Japan
| | - Takashi Iwafune
- First Risk Assessment Division, Food Safety Commission Secretariat of Japan, Tokyo, Japan
| | - Ishwar Chandra Yadav
- Department of International Environmental and Agricultural Science, Tokyo University of Agriculture and Technology, Tokyo, Japan
| | - Hirozumi Watanabe
- Department of International Environmental and Agricultural Science, Tokyo University of Agriculture and Technology, Tokyo, Japan
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Yoon SA, Kim W, Sharma A, Verwilst P, Won M, Lee MH. A Fluorescent Cy7-Mercaptopyridine for the Selective Detection of Glutathione over Homocysteine and Cysteine. Sensors (Basel) 2018; 18:E2897. [PMID: 30200477 PMCID: PMC6164685 DOI: 10.3390/s18092897] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 08/26/2018] [Accepted: 08/30/2018] [Indexed: 11/20/2022]
Abstract
We describe a near-infrared (NIR) fluorescent probe 1 for the selective detection of GSH over Hcy and Cys under physiological conditions. Probe 1 was composed of Cy7 as a NIR dye and 2-mercaptopyridine as a GSH-reactive site and fluorescence quencher. In the presence of GSH, the 2-mercaptopyridine functionality of probe 1 was replaced by the thiolate group of GSH through a nucleophilic substitution reaction with a fluorescence increase at 818 nm. The probe was found to be highly selective for GSH over Hcy, Cys, and other tested potential interferants, including ROS and metal ions. In addition, probe 1 successfully displayed fluorescence changes in response to changing the GSH concentrations in MDA-MB-231 cells in the presence of external agents i.e., N-acetyl-l-cysteine (NAC; as GSH inducer) or buthionine sulfoximine (BSO; as GSH inhibitor). We envision that probe 1 will serve as a promising sensing tool for monitoring the changes of the GSH level and the understanding of the roles of GSH under physiological and pathological conditions.
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Affiliation(s)
- Shin A Yoon
- Department of Chemistry, Sookmyung Women's University, Seoul 04310, Korea.
| | - Wantae Kim
- School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea.
| | - Amit Sharma
- Department of Chemistry, Korea University, Seoul 02841, Korea.
| | - Peter Verwilst
- Department of Chemistry, Korea University, Seoul 02841, Korea.
| | - Miae Won
- Department of Chemistry, Korea University, Seoul 02841, Korea.
| | - Min Hee Lee
- Department of Chemistry, Sookmyung Women's University, Seoul 04310, Korea.
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Katna S, Dubey JK, Patyal SK, Devi N, Chauhan A, Sharma A. Residue dynamics and risk assessment of Luna Experience® (fluopyram + tebuconazole) and chlorpyrifos on French beans (Phaseolus vulgaris L.). Environ Sci Pollut Res Int 2018; 25:27594-27605. [PMID: 30054838 DOI: 10.1007/s11356-018-2733-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 07/05/2018] [Indexed: 06/08/2023]
Abstract
The persistence of chlorpyrifos, fluopyram, and tebuconazole was estimated in green pods, matured seeds, and soil of French beans using dispersive QuEChERS. Three foliar applications each of chlorpyrifos and a combination fungicide fluopyram + tebuconazole (Luna experience, 400 SC) were applied at 600 and 125 + 125 as a standard dose and 1200 and 250 + 250 g a.i. ha-1 as a double dose, respectively, were applied at an interval of 10 days and treated pods were picked up at regular intervals. Dried mature seeds and soil were also monitored at harvest. The initial deposits of chlorpyrifos on bean pods were 3.083 and 6.017 mg kg-1 with a half-life of 1.86 and 2.29 days, at respective doses. Foliar application of a combi product Luna experience yielded 3.396 and 5.772 mg kg-1 residues of fluopyram and 3.613 and 5.887 mg kg-1 of tebuconazole in green pods at standard and double dose with almost same half-lives of 3.4 and 3.8-3.9 days. Residues declined below the limit of quantitation (LOQ) of 0.05 mg kg-1 in green beans after 15 and 25 days after the application of double dose of chlorpyrifos and Luna experience, respectively. However, the residues in dry bean seeds and soil reached below the LOQ of 0.05 mg kg-1 at the time of harvest. A pre-harvest interval of 5, 10, and 7 days has been proposed for chlorpyrifos, fluopyram, and tebuconazole, respectively, in beans. HQ < 1 and TMDI < MPI in all test chemicals. Hence, it was concluded that a waiting period of 5 days for chlorpyrifos and 7-10 days in Luna experience will be safer to consumers. This data generated will be useful for regulatory agency for fixing MRLs.
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Affiliation(s)
- Sapna Katna
- Department of Entomology, Dr Y.S. Parmar University of Horticulture and Forestry, Nauni, Solan, 173 230, India
| | - Jatiender Kumar Dubey
- Department of Entomology, Dr Y.S. Parmar University of Horticulture and Forestry, Nauni, Solan, 173 230, India.
| | - Surender Kumar Patyal
- Department of Entomology, Dr Y.S. Parmar University of Horticulture and Forestry, Nauni, Solan, 173 230, India
| | - Nisha Devi
- Department of Entomology, Dr Y.S. Parmar University of Horticulture and Forestry, Nauni, Solan, 173 230, India
| | - Avinash Chauhan
- Department of Entomology, Dr Y.S. Parmar University of Horticulture and Forestry, Nauni, Solan, 173 230, India
| | - Ajay Sharma
- Department of Entomology, Dr Y.S. Parmar University of Horticulture and Forestry, Nauni, Solan, 173 230, India
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Li W, Mao J, Dai X, Zhao X, Qiao C, Zhang X, Pu E. Residue determination of triclopyr and aminopyralid in pastures and soil by gas chromatography-electron capture detector: Dissipation pattern under open field conditions. Ecotoxicol Environ Saf 2018; 155:17-25. [PMID: 29494835 DOI: 10.1016/j.ecoenv.2018.02.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Revised: 02/10/2018] [Accepted: 02/12/2018] [Indexed: 06/08/2023]
Abstract
In this study, a new method for the simultaneous quantitative determination of triclopyr and aminopyralid in forage grass, hay, and soil was developed and validated using gas chromatography coupled with electron capture detector (GC-ECD). In this method, a simple and maneuverable esterification reaction was applied to convert the two acidic herbicides into their ester form with methanol. The target compounds were extracted with 1% hydrochloric acid-acetonitrile, esterified, purified by florisil solid-phase extraction cartridge, and detected in a single run by the GC-ECD. The average recoveries using this method, at different fortified levels, ranged from 80% to 104% with intra-day and inter-day RSDs in the range of 1.2-10.8% and 3.3-10.3% for both the herbicides, respectively. The LODs were below 0.02 mg/kg while the LOQs were below 0.05 mg/kg, both of which were much lower than the maximum residue limits (MRLs) of 25-700 mg/kg in pastures, as established by the USA (the code of federal regulations). The open field dissipation and residual analysis in pastures and soil were conducted with the commercial formulation at two locations. With time, both triclopyr and aminopyralid dissipated via first-order kinetics. In forage grass, both compounds degraded rapidly over the first 14- or 21-d period and at a slow rate over the remainder of experimental days. In soil, they degraded at a relatively slow rate, and dissipated steadily to below or close to the LOQ by 60-d post application. The half-lives of triclopyr were 1.4-1.8 d and 6.2-9.0 d and aminopyralid were 1.7-2.1 d and 8.2-10.6 d in terms of forage grass and soil, respectively. The terminal residue results indicated that on 7 d after the treatment, the residues of aminopyralid and triclopyr in forage grass and hay were lower than the MRLs set by the USA. This work can provide guidance on the reasonable use of these herbicides and also provide an analytical method for the determination of triclopyr and aminopyralid in pasture and soil.
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Affiliation(s)
- Wenxi Li
- Institute of Agricultural Environment and Resource, Yunnan Academy of Agricultural Science, Beijing Road No. 2238, Panlong District, Yunnan 650205, China
| | - Jia Mao
- Institute of Agricultural Environment and Resource, Yunnan Academy of Agricultural Science, Beijing Road No. 2238, Panlong District, Yunnan 650205, China
| | - Xuefang Dai
- Institute of Agricultural Environment and Resource, Yunnan Academy of Agricultural Science, Beijing Road No. 2238, Panlong District, Yunnan 650205, China
| | - Xin Zhao
- College of Resource and Environment, Yunnan Agricultural University, Fengyuan Road No. 452, Panlong District, Yunnan 650201, China
| | - Chengkui Qiao
- Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Weilai South Road, Huizu District, Zhengzhou 450009, China
| | - Xueyan Zhang
- Institute of Agricultural Environment and Resource, Yunnan Academy of Agricultural Science, Beijing Road No. 2238, Panlong District, Yunnan 650205, China
| | - Entang Pu
- Institute of Agricultural Environment and Resource, Yunnan Academy of Agricultural Science, Beijing Road No. 2238, Panlong District, Yunnan 650205, China.
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Li Y, Long L, Yan H, Ge J, Cheng J, Ren L, Yu X. Comparison of uptake, translocation and accumulation of several neonicotinoids in komatsuna (Brassica rapa var. perviridis) from contaminated soils. Chemosphere 2018; 200:603-611. [PMID: 29510368 DOI: 10.1016/j.chemosphere.2018.02.104] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 02/01/2018] [Accepted: 02/17/2018] [Indexed: 06/08/2023]
Abstract
The accumulation of pesticides in vegetables may have serious effects on human health and ecosystems via food chains; therefore, it is of great importance to investigate the uptake and accumulation behaviours of pesticides in vegetable tissues. In the present study, the uptake, translocation and accumulation of five neonicotinoids, thiamethoxam (THIM), clothianidin (CLO), thiacloprid (THID), acetamiprid (ACE) and dinotefuran (DIN), in komatsuna (Brassica rapa var. perviridis, a vegetable) were investigated. The concentrations of neonicotinoids in vegetable tissues ranged from 0.068 ± 0.002 to 29.6 ± 2.5 mg/kg. During the cultivation (except for the first day), the concentration of each neonicotinoid in shoots was the highest, followed by roots and the soil. The concentrating of neonicotinoids from the soil to roots followed the order of THIM > CLO > THID > DIN > ACE, while the order of the ability of translocation neonicotinoids from roots to shoots was the just opposite. The difference in uptake and translocation behaviours of the test neonicotinoids seems to be not correlated with the octanol/water partition coefficient (logKow), water solubility or dissociation constant (pKa), but significantly correlated with molecular weight. In addition, a greater concentration of the THIM-metabolite clothianidin (M-CLO) was detected in vegetable shoots than in roots and the soil.
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Affiliation(s)
- Yong Li
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing 210014, China; Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China
| | - Ling Long
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing 210014, China; Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China; College of Agriculture, Guangxi Univerisity, Nanning 530005, China
| | - Huangqian Yan
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing 210014, China; Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China
| | - Jing Ge
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing 210014, China; Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China
| | - Jinjin Cheng
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing 210014, China; Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China
| | - Liyun Ren
- College of Agriculture, Guangxi Univerisity, Nanning 530005, China.
| | - Xiangyang Yu
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing 210014, China; Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China.
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Liu X, Wu S, Zhang D, Shen J, Han W, Sun X, Li J, Wang L. Simultaneous pyridine biodegradation and nitrogen removal in an aerobic granular system. J Environ Sci (China) 2018; 67:318-329. [PMID: 29778165 DOI: 10.1016/j.jes.2017.09.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 09/30/2017] [Accepted: 09/30/2017] [Indexed: 06/08/2023]
Abstract
Simultaneous pyridine biodegradation and nitrogen removal were successfully achieved in a sequencing batch reactor (SBR) based on aerobic granules. In a typical SBR cycle, nitritation occurred obviously after the majority of pyridine was removed, while denitrification occurred at early stage of the cycle when oxygen consumption was aggravated. The effect of several key operation parameters, i.e., air flow rate, influent NH4+-N concentration, influent pH and pyridine concentration, on nitritation, pyridine degradation and total nitrogen (TN) removal, was systematically investigated. The results indicated that high air flow rate had a positive effect on both pyridine degradation and nitritation but a negative impact of overhigh air flow rate. With the increase of NH4+ dosage, both nitritation and TN removal could be severely inhibited. Slightly alkaline condition, i.e., pH7.0-8.0, was beneficial for both pyridine degradation and nitritation. High pyridine dosage often resulted in the delay of both pyridine degradation and nitritation. Besides, extracellular polymeric substances production was affected by air flow rate, NH4+ dosage, pyridine dosage and pH. In addition, high-throughput sequencing analysis demonstrated that Bdellovibrio and Paracoccus were the dominant species in the aerobic granulation system. Coexistence of pyridine degrader, nitrification related species, denitrification related species, polymeric substances producer and self-aggregation related species was also confirmed by high-throughput sequencing.
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Affiliation(s)
- Xiaodong Liu
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Shijing Wu
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Dejin Zhang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Jinyou Shen
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
| | - Weiqing Han
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Xiuyun Sun
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Jiansheng Li
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Lianjun Wang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
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Niu L, Ma S. [Analysis of 2, 3-pyridinedicarboximide and its products conversed by engineering strain with high performance liquid chromatography]. Se Pu 2018; 36:413-415. [PMID: 30136527 DOI: 10.3724/sp.j.1123.2017.09039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023] Open
Abstract
A high performance liquid chromatography (HPLC) method was established for the detection of 2, 3-pyridinedicarboximide (PDI) and its enzyme reaction products, 3-carbamoyl-α-picolinic acid (α-3CP), using an engineering strain containing the D-hydantoinase gene expression box.The strain pET3a-hyd/BL21(DE3) was collected after induction and added to a PDI saturated aqueous solution.After reacting at 37℃ for 30 min with constant stirring, the supernatant was separated by centrifugation at 13000 r/min and detected by HPLC.The chromatographic conditions were as follows:HypersilTM GOLD C18 column (250 mm×4.6 mm, 5 μm), H2O-acetonitrile (90:10, v/v) containing 0.1%(v/v) trifluoroacetic acid as the mobile phase with a flow rate of 1 mL/min and a detection wavelength of 254 nm.The specific activity of pET3a-hyd/BL21(DE3) was found to be 0.61 U/(mL·10OD600 nm).This study provides a theoretical basis for the preparation of complicated half-amides using biological methods.
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Affiliation(s)
- Lixi Niu
- Institute of Biotechnology, Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Shanxi University, Taiyuan 030006, China. ##Email#
| | - Shishi Ma
- Institute of Biotechnology, Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Shanxi University, Taiyuan 030006, China. ##Email#
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Chawla S, Patel DJ, Patel SH, Kalasariya RL, Shah PG. Behaviour and risk assessment of fluopyram and its metabolite in cucumber (Cucumis sativus) fruit and in soil. Environ Sci Pollut Res Int 2018; 25:11626-11634. [PMID: 29429109 DOI: 10.1007/s11356-018-1439-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 01/30/2018] [Indexed: 06/08/2023]
Abstract
A field experiment was conducted to estimate residue persistence of fluopyram and its metabolite benzamide in cucumber fruits and soil and their risk assessment in humans and soil environment. Fluopyram (Kafka, 400 SC) was applied as soil drench twice at the interval of 15 days at the rate of 250 (standard dose) and 500 (double dose) g a.i. ha-1 (active ingredient per hectare). Cucumber fruits were collected at 0 (1 h), 1, 3, 5, 7, 10, 15, 20, 30, 40 and 50 days after second application. Soil samples were collected on 15th day after second application. Drench application resulted in detection of residues on the third day in standard dose at the levels of 0.056 mg kg-1 in cucumber fruit. The residue level increased until 20 days reaching 0.092 mg kg-1 followed by decrease to 0.068 mg kg-1 on 30th day after application. In double dose, the residues started accumulating from 0 day with initial levels of 0.093 mg kg-1 and persisted until 30th day. The levels varied between 0.123 and 0.184 mg kg-1 until 15th day of application followed by decrease to 0.127 mg kg-1 by 30th day. The residues reached below determination level (< 0.05 mg kg-1) on 40th day in both the doses after second application. The residue of metabolite benzamide was below determination level (< 0.05 mg kg-1) at both the doses. Hazard quotient (HQ) for residues levels at 15th and 30th day was less than one (HQ < 1). Hence, a pre-harvest interval of 15 days is suggested. Present data can be used to establish maximum residue limit (MRL) in India. The residue of fluopyram in soil on 15th day and the data on soil adsorption coefficient of fluopyram from literature suggests moderate mobility of fluopyram in soil. However, residues of metabolite of benzamide were not detected in soil. Further studies on translocation of fluopyram in soil over the time can be conducted for better understanding of environmental risk. To our knowledge, this is the first report on residue levels of fluopyram in any crop when applied as soil drench.
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Affiliation(s)
- Suchi Chawla
- Pesticide Residue Laboratory, All India Network Project on Pesticide Residues, Anand Agricultural University, Anand, Gujarat, 388110, India.
| | - Dilip J Patel
- Pesticide Residue Laboratory, All India Network Project on Pesticide Residues, Anand Agricultural University, Anand, Gujarat, 388110, India
| | - Sunny H Patel
- Pesticide Residue Laboratory, All India Network Project on Pesticide Residues, Anand Agricultural University, Anand, Gujarat, 388110, India
| | - Ravi L Kalasariya
- Pesticide Residue Laboratory, All India Network Project on Pesticide Residues, Anand Agricultural University, Anand, Gujarat, 388110, India
| | - Paresh G Shah
- Pesticide Residue Laboratory, All India Network Project on Pesticide Residues, Anand Agricultural University, Anand, Gujarat, 388110, India
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Watanabe H, Oda S, Abe R, Tanaka Y, Tatarazako N. Comparison of the effects of constant and pulsed exposure with equivalent time-weighted average concentrations of the juvenile hormone analog pyriproxyfen on the reproduction of Daphnia magna. Chemosphere 2018; 195:810-816. [PMID: 29289908 DOI: 10.1016/j.chemosphere.2017.12.124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 12/16/2017] [Accepted: 12/20/2017] [Indexed: 06/07/2023]
Abstract
Short-term pulsed exposure tests have been increasingly used to evaluate the ecotoxicity of pollutants of which concentrations vary over time in the field. In pulsed exposure, time-weighted average (TWA) concentration is often used as an index of exposure. However, there have been few studies to demonstrate whether TWA concentration can be used to evaluate the effect of endocrine-disrupting chemicals on the daphnids. Pyriproxyfen is one of the juvenile hormone analogs that induces daphnids to produce male offspring. To evaluate whether peak or TWA concentration can explain the effects of pyriproxyfen on daphnid reproduction, we measured the number of offspring and the proportion of male offspring produced by Daphnia magna during 21-day under different exposure treatments, constant, single-pulse, and multi-pulse exposure, at an equivalent TWA concentration. Constant exposure of 50 ng/L pyriproxyfen did not affect either the fecundity or the proportion of male offspring, while a single-pulse exposure of 525 ng/L pyriproxyfen over 2 day at four different age did not reduce fecundity, but the proportion of male offspring increased age dependently. Multi-pulses exposure of 131 ng/L pyriproxyfen over two days four times (total eight days) resulted in a decrease in fecundity and the highest proportion of male offspring. Daily observation demonstrated that male offspring was only produced several days after the exposure to a certain concentration of pyriproxyfen. Therefore, neither TWA nor peak concentration accurately evaluated the effects of pulsed exposure of pyriproxyfen on the reproduction of D. magna, particularly its effect on the proportion of male offspring.
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Affiliation(s)
- Haruna Watanabe
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki, 305-8506, Japan.
| | - Shigeto Oda
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki, 305-8506, Japan.
| | - Ryoko Abe
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki, 305-8506, Japan.
| | - Yoshinari Tanaka
- Graduate School of Global Environmental Studies, Sophia University, 7-1, Kioicho, Chiyoda-ku, Tokyo, 102-8554, Japan.
| | - Norihisa Tatarazako
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki, 305-8506, Japan.
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Maharajan K, Muthulakshmi S, Nataraj B, Ramesh M, Kadirvelu K. Toxicity assessment of pyriproxyfen in vertebrate model zebrafish embryos (Danio rerio): A multi biomarker study. Aquat Toxicol 2018; 196:132-145. [PMID: 29407799 DOI: 10.1016/j.aquatox.2018.01.010] [Citation(s) in RCA: 113] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 01/10/2018] [Accepted: 01/11/2018] [Indexed: 06/07/2023]
Abstract
Pyriproxyfen (2-[1-methyl-2-(4-phenoxyphenoxy) ethoxy] pyridine) (PPF), a pyridine-based pesticide widely used to control agricultural insect pests and mosquitoes in drinking water sources. However, its ecotoxicological data is limited in aquatic vertebrates particularly in fish. Hence, the present study aimed to evaluate the adverse effect of PPF in zebrafish embryo development (Danio rerio). In order to investigate the impact of PPF, embryos were exposed to 0.16, 0.33 and 1.66 μg/mL (0.52, 1.04 and 5.2 μM, respectively) for 96 hpf and various biomarker indices such as developmental toxicity (edema formation, hyperemia, heart size and scoliosis), oxidative stress (reactive oxygen species (ROS), lipid peroxidation (LPO) and nitric oxide (NO)), antioxidant responses (superoxide dismutase (SOD), catalase (CAT), glutathione S-transferase (GST), glutathione peroxidase (GPx) and reduced glutathione (GSH)), biochemical (lactate dehydrogenase (LDH) and acid phosphatase (AP)), neurotoxicity (acetylcholinesterase (AChE)), genotoxicity (apoptosis and DNA damage) and histopathological changes were determined. The results showed that severe developmental deformities and changes in heart rate were observed in embryos treated with highest (1.66 μg/mL) concentration than the control (P < 0.05). Heart size measurement showed that, significant change in heart size (P < 0.01) was observed in embryos of 96 hpf only at 1.66 μg/mL PPF exposure. The oxidative stress was apparent at highest test concentration (1.66 μg/mL) as reflected by the elevated ROS, LPO and NO and changes in antioxidant enzyme activities including SOD, CAT, GST and GPx (P < 0.05). Besides, GSH level and AChE activity were significantly lowered in 1.66 μg/mL PPF exposed group than the control. After 96 hpf of PPF exposure, no significant changes were found in AP activity whereas, a biphasic response was observed in the LDH activity. There was no genotoxic effect in embryos exposed to PPF at 0.16 and 0.33 μg/mL, while significant (P < 0.05) DNA damage and apoptosis were found in 1.66 μg/mL treated group. Histopathological analysis revealed that exposure to PPF at 1.66 μg/mL resulted in thinning of heart muscles, pericardial edema and hyperemia while there was no obvious changes were observed in other treatment groups. Hence, the results of the present study demonstrate that PPF could cause adverse effect on early developmental stages of zebrafish at higher concentration.
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Affiliation(s)
- Kannan Maharajan
- DRDO-BU Center for Life Sciences, Bharathiar University Campus, Coimbatore, India
| | | | - Bojan Nataraj
- Unit of Toxicology, Department of Zoology, Bharathiar University, Coimbatore, India
| | - Mathan Ramesh
- DRDO-BU Center for Life Sciences, Bharathiar University Campus, Coimbatore, India; Unit of Toxicology, Department of Zoology, Bharathiar University, Coimbatore, India.
| | - Krishna Kadirvelu
- DRDO-BU Center for Life Sciences, Bharathiar University Campus, Coimbatore, India
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Piechowicz B, Woś I, Podbielska M, Grodzicki P. The transfer of active ingredients of insecticides and fungicides from an orchard to beehives. J Environ Sci Health B 2018; 53:18-24. [PMID: 29083963 DOI: 10.1080/03601234.2017.1369320] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This investigation was undertaken to determine whether active ingredients (AIs) of currently recommended plant protection products (PPPs) could be transferred to beehives from apple and pear trees. A field trial was carried out with apple trees of Ligol and Idared variety, and pear trees of Conference variety. For pest and diseases control of fungal origin, recommended PPPs were applied. Samples of flowers from the above-mentioned varieties of fruit trees, of bees, brood and honey from beehives located in their direct neighborhood were collected regularly and analyzed for the presence of lambda-cyhalothrin (an insecticide) and cyprodinil, captan, fluopyram, kresoxim-methyl, penthiopyrad and trifloxystrobin (fungicides). In samples of flowers of Ligol variety, fluopyram residues (on average 0.621 µg single flower-1) were at the highest levels, whereas in samples of pear flowers of Conference variety, and in flowers of Idared variety, captan residues (on average, respectively, 0.705 and 165.7 µg single flower-1). In samples of bees and honey, residues of five AIs were detected, and in brood six AIs, whereby in each case captan residues prevailed, respectively, up to 585.2, 51.52 and 126.5 µg kg-1 bees and honey. In the honey, significantly larger residues of captan were found out than maximum residue level (MRL) for this AI - 103.04% MRL. In the case of any AI, the daily intake did not exceed 0.002% acceptable daily intake (ADI).
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Affiliation(s)
- Bartosz Piechowicz
- a Department of Ecotoxicology , Institute of Biotechnology, University of Rzeszów , Werynia , Poland
| | - Izabela Woś
- a Department of Ecotoxicology , Institute of Biotechnology, University of Rzeszów , Werynia , Poland
| | - Magdalena Podbielska
- a Department of Ecotoxicology , Institute of Biotechnology, University of Rzeszów , Werynia , Poland
| | - Przemysław Grodzicki
- b Department of Animal Physiology, Faculty of Biology an Environmental Protection , Nicolaus Copernicus University , Toruń , Poland
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Lavtizar V, Kimura D, Asaoka S, Okamura H. The influence of seawater properties on toxicity of copper pyrithione and its degradation product to brine shrimp Artemia salina. Ecotoxicol Environ Saf 2018; 147:132-138. [PMID: 28841528 DOI: 10.1016/j.ecoenv.2017.08.039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 08/03/2017] [Accepted: 08/15/2017] [Indexed: 06/07/2023]
Abstract
Copper pyrithione (CuPT) is a biocide, used worldwide to prevent biofouling on submerged surfaces. In aquatic environments it rapidly degrades, however, one of the degradation products (HPT) is known to react with cupric ion back to its parent compound. Not much is known about the behavior and toxicity of CuPT and its degradation product HPT in different water systems. Hence, our aim was to investigate the ecotoxicity of CuPT, HPT as well as Cu2+ to the brine shrimp Artemia salina in natural seawater and organic matter-free artificial seawater. Moreover, in order to elucidate the influence of ionic strength of water on CuPT toxicity, tests were performed in water media with modified salinity. The results showed that CuPT was the most toxic to the exposed crustaceans in a seawater media with the highest salinity and with no organic matter content. HPT in a presence of cupric ion converted to CuPT, but the measured CuPT concentrations and the mortality of A. salina in natural water were lower than in artificial water. The toxicity of CuPT to A. salina was significantly influenced by the organic matter content, salinity, and proportions of constituent salts in water. In a combination with cupric ion, non-hazardous degradation product HPT exhibits increased toxicity due to its rapid transformation to its parent compound.
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Affiliation(s)
- Vesna Lavtizar
- Laboratory of Maritime Environmental Management, Research Center for Inland Seas, Kobe University, 5-1-1 Fukaeminami, Higashinada-ku, Kobe, Hyogo 658-0022, Japan
| | - Daisuke Kimura
- Laboratory of Maritime Environmental Management, Research Center for Inland Seas, Kobe University, 5-1-1 Fukaeminami, Higashinada-ku, Kobe, Hyogo 658-0022, Japan
| | - Satoshi Asaoka
- Laboratory of Maritime Environmental Management, Research Center for Inland Seas, Kobe University, 5-1-1 Fukaeminami, Higashinada-ku, Kobe, Hyogo 658-0022, Japan
| | - Hideo Okamura
- Laboratory of Maritime Environmental Management, Research Center for Inland Seas, Kobe University, 5-1-1 Fukaeminami, Higashinada-ku, Kobe, Hyogo 658-0022, Japan.
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Caşcaval D, Blaga AC, Galaction AI. Diffusional effects on anaerobic biodegradation of pyridine in a stationary basket bioreactor with immobilized Bacillus spp. cells. Environ Technol 2018; 39:240-252. [PMID: 28274185 DOI: 10.1080/09593330.2017.1298675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Accepted: 02/19/2017] [Indexed: 06/06/2023]
Abstract
The effects of external and internal diffusions of pyridine on its biodegradation rate in a bioreactor with a stationary basket bed of immobilized Bacillus spp. cells have been investigated for various biocatalyst diameters and thicknesses of the basket bed, considering the adapted Haldane kinetic model for substrate inhibition. Due to the very low values of pyridine mass flow inside the biocatalyst particles, the 'biological inactive region' appeared mainly near the particles' centre. This region is extended up to 38.5% from the overall volume of each studied size of the biocatalysts, increasing at higher biocatalyst size and basket bed width. Compared to the system containing free Bacillus spp. cells, the basket configuration of packed bed led to the reduction of biodegradation rate up to 82 times, similar to the mobile bed or column packed bed. The cumulated analysis of the influences of the studied factors allowed concluding that the optimum diameter of biocatalysts is 3 mm.
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Affiliation(s)
- Dan Caşcaval
- a Department of Organic, Biochemical and Food Engineering , 'Gheorghe Asachi' Technical University of Iasi , Iasi , Romania
| | - Alexandra Cristina Blaga
- a Department of Organic, Biochemical and Food Engineering , 'Gheorghe Asachi' Technical University of Iasi , Iasi , Romania
| | - Anca-Irina Galaction
- b Faculty of Medical Bioengineering, Department of Biomedical Science , 'Grigore T. Popa' University of Medicine and Pharmacy of Iasi , Iasi , Romania
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Liu CY, Lau KY, Hsu CC, Chen JL, Lee CH, Huang TT, Chen YT, Huang CT, Lin PH, Tseng LM. Combination of palbociclib with enzalutamide shows in vitro activity in RB proficient and androgen receptor positive triple negative breast cancer cells. PLoS One 2017; 12:e0189007. [PMID: 29261702 PMCID: PMC5737960 DOI: 10.1371/journal.pone.0189007] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 11/16/2017] [Indexed: 11/29/2022] Open
Abstract
Objectives Triple negative breast cancer (TNBC) lacks specific drug targets and remains challenging. Palbociclib, a cyclin-dependent kinases 4 and 6 (CDK4/6) inhibitor is approved for metastatic estrogen receptor (ER)-positive and human epithermal growth factor 2 (HER2)-negative breast cancer. The nature of cell cycle inhibition by palbociclib suggests its potential in TNBC cells. Retinoblastoma (RB, a known substrate of CDK4/6) pathway deregulation is a frequent occurrence in TNBC and studies have revealed that pharmacological CDK4/6 inhibition induces a cooperative cytostatic effect with doxorubicin in RB-proficient TNBC models. In addition, recent studies reported that anti-androgen therapy shows preclinical efficacy in androgen-receptor (AR)-positive TNBC cells. Here we examined the effect of palbociclib in combination with an anti-androgen enzalutamide in TNBC cells. Method MDA-MB-453, BT-549, MDA-MB-231 and MDA-MB-468 TNBC cell lines were used for in vitro studies. Protein expressions were assessed by Western blot analysis. Cytostatic effect was examined by MTT assay. Cell cycle and apoptosis were examined by flow cytometry. Results Palbociclib showed inhibitory effect in RB-proficient TNBC cells, and enzalutamide inhibited cell viability in AR-positive TNBC cells. Enzalutamide treatment could enhance the palbociclib-induced cytostatic effect in AR-positive/RB-proficient TNBC cells. In addition, palbociclib-mediated G1 arrest in AR-positive/RB-proficient TNBC cells was attenuated by RB knockdown. Conclusion Our study provided a preclinical rationale in selecting patients who might have therapeutic benefit from combining CDK4/6 inhibitors with AR antagonists.
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Affiliation(s)
- Chun-Yu Liu
- Comprehensive Breast Health Center, Taipei Veterans General Hospital, Taipei, Taiwan
- School of Medicine, National Yang-Ming University, Taipei, Taiwan
- Division of Medical Oncology, Department of Oncology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Ka-Yi Lau
- Division of Medical Oncology, Department of Oncology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Chia-Chi Hsu
- Comprehensive Breast Health Center, Taipei Veterans General Hospital, Taipei, Taiwan
- Division of Medical Oncology, Department of Oncology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Ji-Lin Chen
- Comprehensive Breast Health Center, Taipei Veterans General Hospital, Taipei, Taiwan
- Division of Medical Oncology, Department of Oncology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Chia-Han Lee
- Division of Medical Oncology, Department of Oncology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Tzu-Ting Huang
- Comprehensive Breast Health Center, Taipei Veterans General Hospital, Taipei, Taiwan
- Division of Medical Oncology, Department of Oncology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Yi-Ting Chen
- Division of Medical Oncology, Department of Oncology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Chun-Teng Huang
- School of Medicine, National Yang-Ming University, Taipei, Taiwan
- Division of Hematology & Oncology, Department of Medicine, Yang-Ming Branch of Taipei City Hospital, Taipei, Taiwan
| | - Po-Han Lin
- Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan
| | - Ling-Ming Tseng
- Comprehensive Breast Health Center, Taipei Veterans General Hospital, Taipei, Taiwan
- School of Medicine, National Yang-Ming University, Taipei, Taiwan
- Department of Surgery, Taipei Veterans General Hospital, Taipei, Taiwan
- * E-mail:
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Khan MA, Ruberson JR. Lethal effects of selected novel pesticides on immature stages of Trichogramma pretiosum (Hymenoptera: Trichogrammatidae). Pest Manag Sci 2017; 73:2465-2472. [PMID: 28600808 DOI: 10.1002/ps.4639] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 05/08/2017] [Accepted: 06/06/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Trichogramma pretiosum Riley is an important egg parasitoid and biological control agent of caterpillar pests. We studied the acute toxicity of 20 pesticides (14 insecticides/miticides, three fungicides and three herbicides) exposed to recommended field rates. Egg, larval, and pupal stages of the parasitoid in their hosts were dipped in formulated solutions of the pesticides and evaluated 10 days later for percentage of host eggs with holes, number of parasitoids emerged per egg with holes, and stage-specific mortality of immature as well as adult wasps within the host eggs. RESULTS Seven insecticides (buprofezin, chlorantraniliprole, spirotetramat, flonicamid, flubendiamide) and miticides (spiromesifen, cyflumetofen), one herbicide (nicosulfuron), and three fungicides (myclobutanil, pyraclostrobin, trifloxystrobin + tebuconazole) caused no significant mortality to immature stages or pre-emergent adult parasitoids relative to controls. By contrast, seven insecticides/miticides (abamectin, acetamiprid, dinotefuran, fipronil, novaluron, spinetoram, tolfenpyrad) adversely affected immature and pre-emergent adult T. pretiosum, with tolfenpyrad being particularly lethal. Two herbicides had moderate (glufosinate ammonium) to severe (s-metolachlor) acute lethal effects on the immature parasitoids. CONCLUSIONS This study corroborates earlier findings with adult T. pretiosum. Over half of the pesticides - and all the fungicides - tested in the current study would appear to be compatible with the use of T. pretiosum in integrated pest management programs, with respect to acute parasitoid mortality. © 2017 Society of Chemical Industry.
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Affiliation(s)
| | - John R Ruberson
- Department of Entomology, Kansas State University, Manhattan, Kansas, USA
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Biale H, Geden CJ, Chiel E. Effects of pyriproxyfen on wild populations of the housefly, Musca domestica, and compatibility with its principal parasitoids. Pest Manag Sci 2017; 73:2456-2464. [PMID: 28692174 DOI: 10.1002/ps.4638] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 05/17/2017] [Accepted: 06/06/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND The housefly, Musca domestica L., is an important pest of animal agriculture. Effective fly management requires integration of manure management, mass trapping, biological control, and selective insecticide use. Insecticidal control of houseflies is difficult due to the rapidity of resistance development, yet the insect growth regulator pyriproxyfen (PPF) is one of few insecticides that may still be effective. Here, we tested the susceptibility of wild housefly populations in the USA and in Israel to PPF, as well as the effect of PPF on housefly parasitoids of the genera Muscidifurax and Spalangia. RESULTS Most housefly populations from both countries were completely eliminated at PPF concentrations of 100 mg kg-1 (USA) and 600 mg kg-1 (Israel). One population from each country exhibited initial levels of PPF tolerance. PPF efficacy significantly decreased in cow manure. Emergence rates of parasitoids developing in PPF-treated hosts at concentrations of ≥600 mg kg-1 were significantly affected, whereas other fitness parameters were moderately to non-affected. CONCLUSIONS PPF is still an effective tool for housefly control, but resistance management practices should be employed to avoid resistance. PPF is compatible with principal housefly parasitoids at concentrations <600 mg kg-1 , and is suitable for use in integrated pest management. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Haim Biale
- Department of Biology and Environment, University of Haifa-Oranim, Qiryat Tivon, Israel
- Department of Evolutionary and Environmental Biology, University of Haifa, Haifa, Israel
| | - Christopher J Geden
- USDA, ARS, Center for Medical, Agricultural, and Veterinary Entomology, Gainesville, FL, USA
| | - Elad Chiel
- Department of Biology and Environment, University of Haifa-Oranim, Qiryat Tivon, Israel
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Ganguly P, Barik SR, Patra S, Roy S, Bhattacharyya A. Persistence of chlorfluazuron in cabbage under different agro-climatic conditions of India and its risk assessment. Environ Toxicol Chem 2017; 36:3028-3033. [PMID: 28574603 DOI: 10.1002/etc.3872] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 03/03/2017] [Accepted: 05/31/2017] [Indexed: 06/07/2023]
Abstract
A multilocational field trial was conducted at 4 locations in India-Rajasthan, Gujarat, Madhya Pradesh, and West Bengal-to determine the persistence in cabbage of chlorfluazuron applied twice at 75 and 150 g active ingredient ha-1 . Cabbage head samples were collected from each replicated plot on 0 (2 h after spraying), 1, 3, 5, 7, 10, and 15 d after final insecticide application, including an untreated control. Chlorfluazuron residue in cabbage and field soil was estimated by high-performance liquid chromatography using a photo diode array detector. The limit of determination and limit of quantification of the method were recorded as 0.05 and 0.10 μg g-1 , respectively. Results revealed that chlorfluazuron dissipated linearly with progress of time, following first-order kinetics. The mean (± standard deviation) half-life value of chlorfluazuron in cabbage was found to be 7.18 ± 0.71 d, considering different locations and treatments. The residue was below the level of quantification in the harvested cabbage and soil samples. Harvesting cabbage in the experimental location, at least on day 7, after 2 applications of chlorfluazuron at the recommended dose, may not pose any ill effect for Indian adults. Environ Toxicol Chem 2017;36:3028-3033. © 2017 SETAC.
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Affiliation(s)
- Pritam Ganguly
- Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal, India
| | | | - Sandip Patra
- Indian Council of Agricultural Research for North Eastern Hill Region, Shillong, Meghalaya, India
| | - Sankhajit Roy
- Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal, India
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Zhang Z, Gao Z, Wang Y, Yuan Y, Dong J, Yue T. Transformation products elucidation of forchlorfenuron in postharvest kiwifruit by time-of-flight mass spectrometry. PLoS One 2017; 12:e0184021. [PMID: 28877224 PMCID: PMC5587325 DOI: 10.1371/journal.pone.0184021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 08/16/2017] [Indexed: 01/30/2023] Open
Abstract
Forchlorfenuron (1-(2-chloro-4-pyridyl)-3-phenylurea, FCF) is a plant growth regulator, being extensively used for increasing kiwifruit size. The toxicological properties of its may persist in their transformation products (TPs) or even higher toxicity than FCF. TPs elucidation of FCF in postharvest kiwifruit (Actinidia chinensis, Chinese gooseberry) by the liquid chromatography ionization hybrid ion trap and time-of-flight mass spectrometry (LC-ESI-IT-TOF/MS) in positive mode was the objective of the present study. Fifteen days after full bloom, kiwifruits were dipped for 5s with high dosage FCF solution (60 mg/L), so that sufficient peaks could be detected. The chemical structure of unknown TPs was analyzed in combination of functions of LCMS-IT-TOF, such as high-accurate MSn, formula predictor, metabolite structural analysis software MetID Solution, profiling solution metabolomics software, and neutral loss, characteristic isotopic patterns of chlorine, the fragmentation pattern and retention time of standard substances, nitrogen rule, chemical components of kiwifruit. Total 17 TPs were detected via comparisons of their accurate MSn data of commercial analytical standards and synthesized standards with high purity, such as 4-amino-2-chloropyridine, phenylurea, 2-hydroxy-FCF, 1-(2-chloro-6-((3, 4, 5-trihydroxy-6-(hydroxymethyl) tetrahydro-2H-pyran-2-yl) oxy) pyridin-4-yl)-3-phenylurea, 1, 3-bis (2-chloropyridin-4-yl) urea, 1,3-diphenylurea, 1-(2-chloropyridin-4-yl)urea, FCF-2-O-β-D-glucoside, and so on. The major transformation pathways of FCF in kiwifruit were biochemical and photochemical cleavage pathway. The experimental results indicate that LCMS-IT-TOF is powerful and effective tool for identification of FCF TPs.
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Affiliation(s)
- Zhiwei Zhang
- College of Food Science and Engineering, Northwest A&F University, Shananxi, China
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China
| | - Zhenhong Gao
- College of Food Science and Engineering, Northwest A&F University, Shananxi, China
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China
| | - Yuan Wang
- College of Food Science and Engineering, Northwest A&F University, Shananxi, China
| | - Yahong Yuan
- College of Food Science and Engineering, Northwest A&F University, Shananxi, China
- Laboratory of Quality & Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, Shaanxi,China
- National Engineering Research Center of Agriculture Integration Test (Yangling), Yangling, Shaanxi,China
| | - Jing Dong
- Shimadzu International Trading, Beijing, China
| | - Tianli Yue
- College of Food Science and Engineering, Northwest A&F University, Shananxi, China
- Laboratory of Quality & Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, Shaanxi,China
- National Engineering Research Center of Agriculture Integration Test (Yangling), Yangling, Shaanxi,China
- * E-mail:
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Pang YY, Tan YL, Ho HK. Investigation of the effect of plasma albumin levels on regorafenib-induced hepatotoxicity using a validated liquid chromatography-tandem mass spectrometry method. J Chromatogr B Analyt Technol Biomed Life Sci 2017; 1061-1062:220-224. [PMID: 28750235 DOI: 10.1016/j.jchromb.2017.07.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 07/04/2017] [Accepted: 07/13/2017] [Indexed: 01/07/2023]
Affiliation(s)
- Yi Yun Pang
- Department of Pharmacy, Faculty of Science, National University of Singapore, 18 Science Drive 4, Singapore 117543, Singapore
| | - Yeong Lan Tan
- Department of Pharmacy, Faculty of Science, National University of Singapore, 18 Science Drive 4, Singapore 117543, Singapore
| | - Han Kiat Ho
- Department of Pharmacy, Faculty of Science, National University of Singapore, 18 Science Drive 4, Singapore 117543, Singapore.
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Moustafa AA, Hegazy MA, Mohamed D, Ali O. Novel Approach for the Simultaneous Determination of Carbinoxamine Maleate, Pholcodine, and Ephedrine Hydrochloride Without Interference from Coloring Matter in an Antitussive Preparation Using Smart Spectrophotometric Methods. J AOAC Int 2017; 101:414-426. [PMID: 28766478 DOI: 10.5740/jaoacint.17-0078] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The presence of coloring matters in syrups usually interferes with the spectrophotometric determination of active pharmaceutical ingredients. A novel approach was introduced to eliminate the interference of sunset yellow (coloring matter) in Cyrinol syrup. Smart, simple, accurate, and selective spectrophotometric methods were developed and validated for the simultaneous determination of a ternary mixture of carbinoxamine maleate, pholcodine, and ephedrine hydrochloride in syrup. Four of the applied methods used ratio spectra: successive derivative subtraction coupled with constant multiplication, successive derivative of ratio spectra, ratio subtraction coupled with ratio difference, and ratio spectra continuous wavelet transforms zero-crossing. In addition, a method that was based on the presence of an isosbestic point, the amplitude summation method, was also established. A major advantage of the proposed methods is the simultaneous determination of the mentioned drugs without prior separation steps. These methods were successfully applied for the determination of laboratory-prepared mixtures and a commercial pharmaceutical preparation without interference from additives, thus proving the selectivity of the methods. No significant difference regarding both accuracy and precision was observed upon statistical comparison of the results obtained by the proposed methods with each other and with those of official or reported ones.
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Affiliation(s)
- Azza A Moustafa
- Cairo University, Faculty of Pharmacy, Analytical Chemistry Department, Kasr-El Aini St, 11562 Cairo, Egypt
| | - Maha A Hegazy
- Cairo University, Faculty of Pharmacy, Analytical Chemistry Department, Kasr-El Aini St, 11562 Cairo, Egypt
| | - Dalia Mohamed
- October University for Modern Sciences and Arts, Faculty of Pharmacy, Analytical Chemistry Department, 11787 6th of October City, Egypt Helwan University, Faculty of Pharmacy, Analytical Chemistry Department, Ein Helwan, 11795 Cairo, Egypt
| | - Omnia Ali
- October University for Modern Sciences and Arts, Faculty of Pharmacy, Analytical Chemistry Department, 11787 6th of October City, Egypt
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