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Shao X, Zhao Q, Xia J, Xie M, Li Q, Tang Y, Gu X, Ning X, Geng S, Fu J, Tian S. Ag-modified CuO cavity arrays as a SERS-electrochemical dual signal platform for thiram detection. Talanta 2024; 274:125989. [PMID: 38537357 DOI: 10.1016/j.talanta.2024.125989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 03/16/2024] [Accepted: 03/22/2024] [Indexed: 05/04/2024]
Abstract
Rapid and sensitive determination of pesticide residues in fruits and vegetables is critical for human health and ecosystems. This paper used an Ag-modified CuO sphere-cavity array (CuO@Ag) electrode as a thiram SERS/electrochemical dual readout detection platform. Numerous Raman "hotspots" generated by uniformly distributed silver nanoparticles, charge transfer at the CuO@Ag interface, and the formation of Ag-thiram complexes contribute to the significant enhancement of this SERS substrate, which results in excellent SERS performance with an enhancement factor up to 1.42 × 106. When using SERS as the readout technique, the linear range of the substrate for thiram detection was 0.05-20 nM with a detection limit (LOD) of up to 0.0067 nM. Meanwhile, a correlation between the value of change in current density and thiram concentration was established due to the formation of stable complexes of thiram with Cu2+ generated at specific potentials. The linear range of electrochemical detection was 0.05-20.0 μM, and the detection limit was 0.0167 μM. The newly devised dual-readout sensor offers notable sensitivity and stability. The two signal readout methods complement each other in terms of linear range and detection limit, making it a convenient tool for assessing thiram residue levels in agro-food. At the same time, the combination of commercially available portable equipment makes on-site monitoring possible.
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Affiliation(s)
- Xinyi Shao
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, Jiangsu, PR China
| | - Qun Zhao
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, Jiangsu, PR China.
| | - Jiayi Xia
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, Jiangsu, PR China
| | - Mengxiang Xie
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, Jiangsu, PR China
| | - Qingzhi Li
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, Jiangsu, PR China
| | - Yuqi Tang
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, Jiangsu, PR China
| | - Xuefang Gu
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, Jiangsu, PR China.
| | - Xiaofeng Ning
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, Jiangsu, PR China
| | - Shanshan Geng
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, Jiangsu, PR China
| | - Jin Fu
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, Jiangsu, PR China
| | - Shu Tian
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, Jiangsu, PR China.
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2
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Shao T, Xu J, Zhong H, Hu Y, Chen J. A stable and flexible Au@Ag NPs/PVA SERS platform for thiram residue detection on rough surface. Talanta 2024; 274:126008. [PMID: 38599117 DOI: 10.1016/j.talanta.2024.126008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 02/27/2024] [Accepted: 03/27/2024] [Indexed: 04/12/2024]
Abstract
Flexible and transparent surface-enhanced Raman scattering (SERS) substrates have gained great attention in analysis field as they offer a fast, non-destructive, and highly sensitive platform for in-situ detection. In this work, we present a facile one-pot strategy for synthesizing gold-cored silver shell nanoparticles (Au@Ag NPs) in the polyvinyl alcohol (PVA) colloid. With no other reducing agents, PVA can serve as both reducing and stabilizing agents for forming Au@Ag NPs. Besides, PVA acts as a scaffold to maintain SERS "hot-spots" by preventing nanoparticle aggregation. By using this flexible Au@Ag NPs/PVA colloid, the analytes can be extracted from rough surfaces for SERS measurements with excellent sensitivity, repeatability and stability. The SERS activity of the Au@Ag NPs/PVA remained at 89.8% even after 120 days of storage at room temperature in sealed air atmosphere. The selective detection of thiram residues on the surface of fruits and vegetables was successfully achieved. The limits of detection for thiram residues on apple and tomato surfaces were measured to be 0.58 and 0.56 ng cm-2, respectively, with recovery rate ranging from 91% to 107%. This work demonstrates the immense application potential of SERS colloid platform in the fields of food safety and environmental analysis.
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Affiliation(s)
- Tao Shao
- Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou, 621908, PR China
| | - Jinsong Xu
- Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou, 621908, PR China
| | - Hang Zhong
- Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou, 621908, PR China
| | - Yi Hu
- Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou, 621908, PR China
| | - Jun Chen
- Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou, 621908, PR China.
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3
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Yang Z, Hu L, Ning K, Wu Y, Liang J. A fluorescence sensor for thiram detection based on DNA-templated silver nanoclusters without metal ion-mediator. Food Chem 2023; 413:135428. [PMID: 36758384 DOI: 10.1016/j.foodchem.2023.135428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 12/31/2022] [Accepted: 01/05/2023] [Indexed: 01/09/2023]
Abstract
In this work, we firstly found a strong competitive interaction between thiram and silver atoms of DNA-templated silver nanoclusters (DNA-AgNCs), leading to fluorescence quenching of DNA-AgNCs without additional metal ion-mediator. Furthermore, this thiram-induced fluorescence quenching phenomenon was used to develop a sensor for thiram detection. This fluorescence sensor exhibited good linearity with thiram concentration from 0.20 to 2.0 μM and 0.012-0.20 μM under optimized conditions, with a low detection limit of 0.2 μM and 0.01 μM, respectively. Moreover, this sensor showed superior selectivity towards thiram, and its practicability was verified in apples and soil. This study provides a convenient and rapid "mix and detect" approach for thiram detection within 10 min, suggesting its potential for rapid on-site evaluation of thiram in real samples.
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Affiliation(s)
- Ziyan Yang
- College of Science, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, People's Republic of China
| | - Lingling Hu
- College of Science, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, People's Republic of China
| | - Keke Ning
- College of Science, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, People's Republic of China
| | - Yuan Wu
- College of Science, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, People's Republic of China.
| | - Jiangong Liang
- College of Science, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, People's Republic of China.
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4
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Rapid determination of thiram on apple using a flexible bacterial cellulose-based SERS substrate. Talanta 2023; 254:124128. [PMID: 36462280 DOI: 10.1016/j.talanta.2022.124128] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 11/19/2022] [Accepted: 11/22/2022] [Indexed: 11/25/2022]
Abstract
A flexible nanocomposite composed of bacterial cellulose (BC) and gold nanoparticles (AuNPs) was developed as a SERS substrate to determine thiram on apple surface by two collection methods namely "paste-and-peel" and "wiping". Enhancement factor of this SERS substrate for sensing thiram residues was determined to be 2.8 × 105. Compared to the benchtop Raman spectrometer, portable Raman spectroscopic device showed a lower sensitivity towards thiram residues with limit of detection at 0.98 ppm, satisfying maximum residue level of thiram on apple required by both Europe and America. A good linear correlation of SERS peak intensity at 1368 cm-1 and different concentrations of thiram (1-50 ppm) revealed a coefficient up to 0.99. This flexible BC-based SERS substrate has a great analytical performance in sensitivity, reproducibility and stability, and is suitable for rapid detection (<8 min) and quantitative analysis of pesticides on food surface.
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Simple and rapid colorimetric visualization of tetramethylthiuram disulfide (thiram) sensing based on anti-aggregation of gold nanoparticles. Food Chem 2022; 384:132223. [DOI: 10.1016/j.foodchem.2022.132223] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 01/07/2022] [Accepted: 01/20/2022] [Indexed: 12/11/2022]
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Li A, Li H, Ma Y, Wang T, Liu X, Wang C, Liu F, Sun P, Yan X, Lu G. Bioinspired laccase-mimicking catalyst for on-site monitoring of thiram in paper-based colorimetric platform. Biosens Bioelectron 2022; 207:114199. [PMID: 35325721 DOI: 10.1016/j.bios.2022.114199] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 02/21/2022] [Accepted: 03/16/2022] [Indexed: 12/22/2022]
Abstract
A long-standing goal has been to create artificial enzymes with natural enzyme-like catalytic activity. Herein, a laccase-mimicking catalyst (GSH-Cu) is designed by simulating the copper active sites and spatial amino acid microenvironment of natural enzymes. In particular, the engineered GSH-Cu shows a catalytic function that conforms to Michaelis-Menten kinetics of natural laccase. The high catalytic activity of GSH-Cu can be easily inhibited by thiram through surface passivation to produce copper nanoparticles. We demonstrate that the developed GSH-Cu with high stability and recyclability can be used to fabricate effective colorimetric sensor for sensitive detection of thiram. The resulting absorption intensity can be employed to quantify thiram in the range of 2.5-250 ng mL-1, which meets the detection requirement in fruit. Bestowed with the feasibility analysis of colorimetric output, a portable platform is designed by integrating GSH-Cu based test paper with a conventional smartphone for conveniently on-site quantified thiram. The proposed strategy about engineering enzyme-mimicking catalysts with excellent catalytic performance will open avenues for boosting the sensing application.
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Affiliation(s)
- Aixin Li
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Advanced Gas Sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China
| | - Hongxia Li
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Advanced Gas Sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China; Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, Changchun, 130062, PR China
| | - Yuan Ma
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Advanced Gas Sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China
| | - Tuhui Wang
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Advanced Gas Sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China
| | - Xiaomin Liu
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Advanced Gas Sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China
| | - Chenguang Wang
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Advanced Gas Sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China
| | - Fangmeng Liu
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Advanced Gas Sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China
| | - Peng Sun
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Advanced Gas Sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China
| | - Xu Yan
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Advanced Gas Sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China.
| | - Geyu Lu
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Advanced Gas Sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China.
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7
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Jin Y, Liu K, Li G, Li C, Xiao Z, Yuan C, Li J. In situ reduction triggers the highly sensitive detection of pesticide by classic gold nanoparticle and quantum dots nanocomposite. Anal Chim Acta 2021; 1172:338679. [PMID: 34119016 DOI: 10.1016/j.aca.2021.338679] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 05/07/2021] [Accepted: 05/09/2021] [Indexed: 01/10/2023]
Abstract
Fluorescence "turn on" method is always preferable for target detection under the urgent demand to develop point-of-care portable sensors in practical applications due to its higher selectivity and less false positives. However, there is only few reports of pesticide monitoring based on this strategy so far most probably ascribed to its poor hydrophilicity and reactivity. In this work, triggered by reductant tris (2-carboxyethyl) phosphine hydrochloride (TCEP), initially fluorescence-quenched gold nanoparticles (Au NPs)-decorated quantum dots (QDs)-embedded nanobead shows obvious fluorescence "turn on" signal response to thiram with concentration response range of 0.01-20 μM and limit of detection (LOD) of 7 nM due to the target-induced dissociation of Au NPs from the surface of probe nanobead. Moreover, paper sensor has been successfully developed by immersing commercial drainage membrane in probe solution for visual detection of thiram with the ultrahigh LOD (50 nM) by the naked eye. More importantly, this work, for the first time, reported an in situ reduction strategy to improve the interaction between target and nanoprobe and thus bring obvious signal output for pesticide detection with high sensitivity, demonstrating the potential to expand the detection scope of nanomaterials.
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Affiliation(s)
- Yu Jin
- College of Science, Huazhong Agricultural University, Wuhan, 430070, China
| | - Ke Liu
- College of Science, Huazhong Agricultural University, Wuhan, 430070, China
| | - Guangqiang Li
- College of Science, Huazhong Agricultural University, Wuhan, 430070, China
| | - Chengfei Li
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Zhidong Xiao
- College of Science, Huazhong Agricultural University, Wuhan, 430070, China
| | - Chao Yuan
- College of Science, Huazhong Agricultural University, Wuhan, 430070, China; College of Biomedicine and Health, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Jinquan Li
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China; Interdisciplinary Sciences Institute, Huazhong Agricultural University, Wuhan, 430070, China.
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8
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Development of Monoclonal Antibody-Based EIA for Tetranor-PGDM which Reflects PGD 2 Production in the Body. J Immunol Res 2021; 2021:5591115. [PMID: 33997056 PMCID: PMC8096570 DOI: 10.1155/2021/5591115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 03/31/2021] [Accepted: 04/13/2021] [Indexed: 11/21/2022] Open
Abstract
Tetranor-PGDM is a metabolite of PGD2. Urinary tetranor-PGDM levels were reported to be increased in some diseases, including food allergy, Duchenne muscular dystrophy, and aspirin-intolerant asthma. In this study, we developed a monoclonal antibody (MAb) and a competitive enzyme immunoassay (EIA) for measuring tetranor-PGDM. Spleen cells isolated from mice immunized with tetranor-PGDM were utilized to generate Ab-producing hybridomas. We chose hybridomas and purified MAb against tetranor-PGDM to develop competitive EIA. The assay evaluated the optimal ionic strength, pH, precision, and reliability. Specificity was determined by cross-reactivity to tetranor-PGEM, tetranor-PGFM, and tetranor-PGAM. Recovery was determined by spiking experiments on artificial urine. Optimal ionic strength was 150 mM NaCl, and optimal pH was pH 7.5. Metabolites other than tetranor-PGDM did not show any significant cross-reactivity in the EIA. The assay exhibited a half-maximal inhibition concentration (IC50) of 1.79 ng/mL, limit of detection (LOD) of 0.0498 ng/mL, and range of quantitation (ROQ) value of 0.252 to 20.2 ng/mL. The intra- and inter-assay variation for tetranor-PGDM was 3.9–6.0% and 5.7–10.4%, respectively. The linearity-dilution effect showed excellent linearity under dilution when artificial urine samples were applied to solid-phase extraction (SPE). After SPE, recovery of tetranor-PGDM in artificial urine averaged from 82.3% to 113.5% and was within acceptable limits (80%–120%). We successfully generated one monoclonal antibody and developed a sensitive competitive EIA. The established EIA would be useful for routine detection and monitoring of tetranor-PGDM in research or diagnostic body fluids.
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Advances in the Detection of Dithiocarbamate Fungicides: Opportunities for Biosensors. BIOSENSORS-BASEL 2020; 11:bios11010012. [PMID: 33396914 PMCID: PMC7824625 DOI: 10.3390/bios11010012] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 12/24/2020] [Accepted: 12/27/2020] [Indexed: 12/21/2022]
Abstract
Dithiocarbamate fungicides (DTFs) are widely used to control various fungal diseases in crops and ornamental plants. Maximum residual limits in the order of ppb-ppm are currently imposed by legislation to prevent toxicity problems associated with excessive use of DTFs. The specific analytical determination of DTFs is complicated by their low solubility in water and organic solvents. This review summarizes the current analytical procedures used for the analysis of DTF, including chromatography, spectroscopy, and sensor-based methods and discusses the challenges related to selectivity, sensitivity, and sample preparation. Biosensors based on enzymatic inhibition demonstrated potential as analytical tools for DTFs and warrant further research, considering novel enzymes from extremophilic sources. Meanwhile, Raman spectroscopy and various sensors appear very promising, provided the selectivity issues are solved.
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Preparation of Monolayer Photonic Crystals from Ag Nanobulge-Deposited SiO 2 Particles as Substrates for Reproducible SERS Assay of Trace Thiol Pesticide. NANOMATERIALS 2020; 10:nano10061205. [PMID: 32575646 PMCID: PMC7353115 DOI: 10.3390/nano10061205] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 06/16/2020] [Accepted: 06/18/2020] [Indexed: 01/31/2023]
Abstract
Surface-enhanced Raman scattering (SERS) greatly increases the detection sensitivity of Raman scattering. However, its real applications are often degraded due to the unrepeatable preparation of SERS substrates. Herein presented is a very facile and cost-effective method to reproducibly produce a novel type of SERS substrate, a monolayer photonic crystal (PC). With a building block of laboratory-prepared monodisperse SiO2 particles deposited with space-tunable silver nanobulges (SiO2@nAg), a PC substrate was first assembled at the air-water interface through needle tip flowing, then transferred onto a silicon slide by a pulling technique. The transferred monolayer PCs were characterized by SEM and AFM to have a hexagonal close-packed lattice. They could increase Raman scattering intensity by up to 2.2 × 107-fold, as tested with p-aminothiophenol. The relative standard deviations were all below 5% among different substrates or among different locations on the same substrate. The excellent reproducibility was ascribed to the highly ordered structure of PCs, while the very high sensitivity was attributed to the strong hotspot effect caused by the appropriately high density of nanobulges deposited on SiO2 particles and by a closed lattice. The PC substrates were validated to be applicable to the SERS assay of trace thiol pesticides. Thiram pesticide is an example determined in apple juice samples at a concentration 102-fold lower than the food safety standard of China. This method is extendable to the analysis of other Raman-active thiol chemicals in different samples, and the substrate preparation approach can be modified for the fabrication of more PC substrates from other metallic nanobulge-deposited particles rather than silica only.
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Chen M, Luo W, Liu Q, Hao N, Zhu Y, Liu M, Wang L, Yang H, Chen X. Simultaneous In Situ Extraction and Fabrication of Surface-Enhanced Raman Scattering Substrate for Reliable Detection of Thiram Residue. Anal Chem 2018; 90:13647-13654. [PMID: 30379069 DOI: 10.1021/acs.analchem.8b03940] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
We report a novel strategy of simultaneous in situ extraction and fabrication of surface-enhanced Raman scattering substrate (IE-SERS) to perform selective and reliable on-site determination of thiram residue in soil, fruits, and vegetables. In this protocol, the thiram residue on complex surfaces can facilely diffuse into the solvent (dichloromethane (DCM)) and specifically bind to gold nanoparticles (AuNPs), affording the SERS substrate through the embedding of the thiram-trapped AuNPs into the cellulose p-toluenesulfonates (CTSAs) film through the evaporation of DCM. SERS signals of the specifically prepared CTSAs could be used as an internal standard to calibrate the absolute signal of thiram, which can avoid the fluctuation of SERS intensities caused by uneven and irregular morphology of SERS substrate. Thus, reliable quantitation of thiram through SERS detection and superior reproducibility in the SERS measurement (RSD = 4.21%) were achieved. As for directly sensing the thiram residue in soil, the established method shows strong anti-interference ability and a good linear response from 0.1 to 12 μg/g with a low limit of detection (LOD) of 50 ng/g, which is lower than that of all the previously reported methods. The recoveries range from 91.76 to 112.3% for thiram in paddy soils, indicating that the established IE-SERS method is reliable and applicable to the detection of thiram residue in real soil samples. In addition, the measurement of the residual thiram on strawberry and cucumber surface was also successfully accomplished by this strategy, indicating that the established method also has great potential in the in situ ultrasensitive detection of thiram on irregular fruits and vegetables.
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Affiliation(s)
- Miao Chen
- College of Chemistry and Chemical Engineering , Central South University , Changsha 410083 , Hunan , China
| | - Wen Luo
- College of Chemistry and Chemical Engineering , Central South University , Changsha 410083 , Hunan , China
| | - Qi Liu
- College of Chemistry and Chemical Engineering , Central South University , Changsha 410083 , Hunan , China
| | - Naiying Hao
- College of Chemistry and Chemical Engineering , Central South University , Changsha 410083 , Hunan , China
| | - Yuqiu Zhu
- College of Chemistry and Chemical Engineering , Central South University , Changsha 410083 , Hunan , China
| | - Minzhuo Liu
- College of Chemistry and Chemical Engineering , Central South University , Changsha 410083 , Hunan , China
| | - Lumin Wang
- College of Chemistry and Chemical Engineering , Central South University , Changsha 410083 , Hunan , China
| | - Hua Yang
- College of Chemistry and Chemical Engineering , Central South University , Changsha 410083 , Hunan , China
| | - Xiaoqing Chen
- College of Chemistry and Chemical Engineering , Central South University , Changsha 410083 , Hunan , China.,Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety , Central South University , Changsha 410083 , Hunan , China
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12
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Tang B, Zeng T, Liu J, Zhou J, Ye Y, Wang X. Waste Fiber Powder Functionalized with Silver Nanoprism for Enhanced Raman Scattering Analysis. NANOSCALE RESEARCH LETTERS 2017; 12:341. [PMID: 28486798 PMCID: PMC5422221 DOI: 10.1186/s11671-017-2118-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 05/01/2017] [Indexed: 06/07/2023]
Abstract
Biomass disks based on fine powder produced from disposed wool fibers were prepared for surface-enhanced Raman scattering (SERS). The wool powders (WPs) were modified by silver nanoprisms via an assembly method and then pressed into disks using a hydraulic laboratory pellet press. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were used to characterize the WPs and disks before and after treatment with silver nanoparticles (AgNPs). The WPs retained porous structures after treatment with AgNPs. The silver nanoprisms on WPs were observed clearly and the localized surface plasmon resonance (LSPR) properties of silver nanoprisms led to blue color of wool powder (WP). The obtained WP disks with AgNPs were confirmed to enhance greatly the Raman signal of thiram. The SERS disks are low-cost and convenient to use, with high sensitivity. The characteristic SERS bands of 10-8 M thiram can be identified from WP disks containing silver nanoparticles.
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Affiliation(s)
- Bin Tang
- National Engineering Laboratory for Advanced Yarn and Fabric Formation and Clean Production, Wuhan Textile University, Wuhan, 430073, China
- Institute for Frontier Materials, Deakin University, Geelong, Australia
| | - Tian Zeng
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials and Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Ministry of Education and College of Chemistry and Chemical Engineering, Hubei University, Wuhan, 430062, China
| | - Jun Liu
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials and Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Ministry of Education and College of Chemistry and Chemical Engineering, Hubei University, Wuhan, 430062, China
| | - Ji Zhou
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials and Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Ministry of Education and College of Chemistry and Chemical Engineering, Hubei University, Wuhan, 430062, China.
| | - Yong Ye
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials and Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Ministry of Education and College of Chemistry and Chemical Engineering, Hubei University, Wuhan, 430062, China
| | - Xungai Wang
- National Engineering Laboratory for Advanced Yarn and Fabric Formation and Clean Production, Wuhan Textile University, Wuhan, 430073, China.
- Institute for Frontier Materials, Deakin University, Geelong, Australia.
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13
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Tao W, Zhao A, Sun H, Gan Z, Zhang M, Li D, Guo H. Periodic silver nanodishes as sensitive and reproducible surface-enhanced Raman scattering substrates. RSC Adv 2014. [DOI: 10.1039/c3ra45935g] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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14
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Rastegarzadeh S, Pourreza N, Larki A. Dispersive liquid-liquid microextraction of thiram followed by microvolume UV-vis spectrophotometric determination. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 114:46-50. [PMID: 23756257 DOI: 10.1016/j.saa.2013.05.020] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 05/07/2013] [Accepted: 05/08/2013] [Indexed: 06/02/2023]
Abstract
A novel and simple method for the sensitive determination of trace amounts of fungicide thiram is developed by combination of dispersive liquid-liquid microextraction (DLLME) and microvolume UV-vis spectrophotometry. The method is based on the conversion of thiram to a yellow product in the presence of ethanolic potassium hydroxide and copper sulfate, and its extraction into CCL4 using DLLME technique. In this method the ethanol existing in ethanolic KOH plays as disperser solvent and a cloudy solution is formed by injection of only CCl4 as extractant solvent into sample solution. Under the optimum conditions, the calibration graph was linear over the range of 25-1000 ng mL(-1) of thiram with limit of detection of 11.5 ng mL(-1). The relative standard deviation (RSD) for 100 and 500 ng mL(-1) of thiram was 2.7 and 1.1% (n=8), respectively. The proposed method was successfully applied to determination of thiram in water and plant seed samples.
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Affiliation(s)
- Saadat Rastegarzadeh
- Department of Chemistry, College of Science, Shahid Chamran University, Ahvaz, Iran.
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Trace analysis of pollutants by use of honeybees, immunoassays, and chemiluminescence detection. Anal Bioanal Chem 2012; 405:555-71. [DOI: 10.1007/s00216-012-6443-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 08/27/2012] [Accepted: 09/20/2012] [Indexed: 10/27/2022]
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Baranowska I, Barchanska H, Abuknesha RA, Price RG, Stalmach A. ELISA and HPLC methods for atrazine and simazine determination in trophic chains samples. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2008; 70:341-348. [PMID: 17919722 DOI: 10.1016/j.ecoenv.2007.06.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2006] [Revised: 06/20/2007] [Accepted: 06/30/2007] [Indexed: 05/25/2023]
Abstract
The aim of the research was to determine optimal conditions for atrazine determination in trophic chain samples by means of an antigen-coated tube enzyme-linked immunosorbent assay (ELISA). The ELISA method was used for analysis of a selection of samples and the results and method requirement compared with HPLC. The 2 h competitive ELISA showed a minimum detection limit of 0.05 ng mL(-1) and a dynamic range 0.1-2 ng mL(-1). Investigation of atrazine concentration in a selection of trophic chain samples indicated that the content of atrazine (microg kg(-1)) in soil samples was 3.2-85.4, vegetable roots 32.9-148.9, green parts of plants 67.7-136.4, cereals 42.4-91.5 and samples of animal origin 1.3-8.4. The correlation between results obtained by HPLC and ELISA methods was 0.97. In addition, simazine content was determined by the HPLC method in which the detection limits were 0.2 microg g(-1) for atrazine and 0.3 microg g(-1) for simazine. The content (microg kg(-1)) of simazine in soil samples was 13.5-15.5, in vegetables roots 29.5-93.7, in green parts of plants 34.6-72.6 and in cereals 158-189. The study demonstrates the utility and convenience of the simple, practical and cost-effective ELISA method in a non-immunoassay laboratory for the analysis of food and environmental samples. The method is ideal for the rapid screening of large numbers of samples in laboratories where access to HPLC facilities is limited or lacking. In addition the investigation demonstrates the presence of significant levels of atrazine and simazine in trophic chain samples collected from different areas of the region. As expected, the highest concentration of both herbicides was found in plants.
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Affiliation(s)
- Irena Baranowska
- Department of Analytical and General Chemistry, The Silesian University of Technology, M. Strzody Street 7, 44-100 Gliwice, Poland.
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Girotti S, Maiolini E, Ghini S, Ferri E, Fini F, Nodet P, Eremin S. Quantification of Thiram in Honeybees: Development of a Chemiluminescent ELISA. ANAL LETT 2008. [DOI: 10.1080/00032710701748291] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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18
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Chapter 4 Immunochemical and Receptor Technologies: The Role of Immunoassay, Immunoaffinity Chromatography, Immunosensors and Molecularly Imprinted Polymeric Sensors. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/s0166-526x(08)00004-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Farré M, Kantiani L, Barceló D. Advances in immunochemical technologies for analysis of organic pollutants in the environment. Trends Analyt Chem 2007. [DOI: 10.1016/j.trac.2007.10.004] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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20
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Choi DH, Katakura Y, Matsuda R, Hayashi Y, Hirobe M, Goda Y, Ninomiya K, Shioya S. Validation of a Method for Predicting the Precision, Limit of Detection and Range of Quantitation in Competitive ELISA. ANAL SCI 2007; 23:215-8. [PMID: 17297235 DOI: 10.2116/analsci.23.215] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The mathematical model for predicting the precision, limit of detection (LOD) and range of quantitation (ROQ) in a competitive enzyme-linked immunosorbent assay (ELISA) proposed by Hayashi et al. (Anal. Chem., 2004, 76, 1295) was validated. The model describes the relative standard deviation (RSD) of concentration estimates by the RSDs of pipetting volumes of analyte, enzyme-conjugated antigen, antibody and substrate solutions, and the standard deviation (SD) of inherent absorbances between the wells in an ELISA plate. For 6 kinds of direct competitive ELISA kits, the LOD and ROQ predicted by the model agreed well with those obtained by experiments with real samples. It was also confirmed that the model is applicable to the prediction of uncertainty that depends on the pipetting error of the viscous antiserum solution. The model was demonstrated to be useful for estimating the LOD and ROQ of competitive ELISA.
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Affiliation(s)
- Dong Hwan Choi
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
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Garrido Frenich A, González-Rodríguez MJ, Arrebola FJ, Martínez Vidal JL. Potentiality of Gas Chromatography−Triple Quadrupole Mass Spectrometry in Vanguard and Rearguard Methods of Pesticide Residues in Vegetables. Anal Chem 2005; 77:4640-8. [PMID: 16013883 DOI: 10.1021/ac050252o] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new analytical strategy for the screening and confirmation/quantification of multiclass pesticide residues in vegetables has been established and validated. No complicated sample preparation was needed, but only a simple and rapid extraction using ethyl acetate and sodium sulfate, which required no cleanup. The approach is based on the use of the triple quadrupole (QqQ) mass spectrometry (MS) as detection system in gas chromatography (GC). In a first step, a GC-QqQ-MS screening method, which monitors only one MS/MS transition by compound, allows the identification of approximately 130 pesticides in 11.6 min. In this way, the differentiation between negative and potentially nonnegative samples is carried out. In the second step, the nonnegative samples are reanalyzed by the GC-QqQ-MS confirmation/quantification method, which monitors two or three MS/MS transitions by compound. Confirmation of pesticides was based on the comparison of intensity ratios for the main ions in samples with those obtained on the same day from the standard in a matrix containing the pesticides at a preestablished concentration level. Quantification of the identified and confirmed pesticides was based on the addition standard method, which avoids matrix effect. The proposed analytical strategy allowed a reliable identification and confirmation of the target pesticides at trace levels, reducing analysis time and increasing sample throughput in routine analytical laboratories.
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Zhao YG, Zheng XW, Huang ZY, Yang MM. Voltammetric study on the complex of thiram–copper(II) and its application. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(03)00193-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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