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Yao Y, Yuan H, Zheng Y, Wang M, Li C. An Insight into the Thermal Degradation Pathway of γ-Oryzanol and the Effect on the Oxidative Stability of Oil. J Agric Food Chem 2024; 72:5757-5765. [PMID: 38445360 DOI: 10.1021/acs.jafc.3c08903] [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: 03/07/2024]
Abstract
Thermal stability and antioxidant ability of γ-oryzanol in oil have been widely studied. However, further research is needed to explore its thermal degradation products and degradation pathways. The thermal degradation products of γ-oryzanol in stripped soybean oil were identified and quantified by employing high-performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS) during heating at 180 °C. The results revealed that γ-oryzanol undergoes ester bond cleavage to form trans-ferulic acid and free sterols, and trans-ferulic acid generated intermediate compound 4-vinylguaiacol, which ultimately generated vanillin. Analysis of kinetic and thermodynamic parameters revealed the thermal stability ranking of the four components of γ-oryzanol as follows: CampFA > CAFA > 24MCAFA > SitoFA. Furthermore, γ-oryzanol exhibited superior antioxidant activity at lower temperatures. The results of this study provide a theoretical basis for a better understanding of the thermal stability and antioxidant properties of γ-oryzanol in oil under thermal oxidation conditions.
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Affiliation(s)
- Yunping Yao
- College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Huiping Yuan
- College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Yue Zheng
- College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Mengda Wang
- College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Changmo Li
- College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China
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Hu CY, Xiong C, Lin YL, Zhang TY. Degradation kinetics and disinfection by-products formation of benzophenone-4 during UV/persulfate process. Environ Technol 2024:1-12. [PMID: 38164528 DOI: 10.1080/09593330.2023.2298669] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 12/08/2023] [Indexed: 01/03/2024]
Abstract
The degradation kinetics, reaction pathways, and disinfection by-products formation of an organic UV filter, benzophenone-4 (BP4) during UV/persulfate oxidation were investigated. BP4 can hardly be degraded by UV alone, but can be effectively decomposed by UV/persulfate following pseudo-first order kinetics. BP4 degradation rate was enhanced with increasing persulfate dosage and decreasing pH from 8 to 5. However, the degradation rate of BP4 at pH 9 was higher than that at pH 8 because of the presence of phenolic group in BP4 structure. and SO 4 - ⋅ were confirmed as the major contributors to BP4 decomposition in radical scavenging experiments, and the second-order rate constants between HO ⋅ and BP4 as well as those between SO 4 - ⋅ and BP4 were estimated by establishing and solving a kinetic model. The presence of B r - and humic acid inhibited the decomposition of BP4, while N O 3 - promoted it. The mineralisation of BP4 was only 9.1% at the persulfate concentration of 50 μM. Six degradation intermediates were identified for the promulgation of the reaction pathways of BP4 during UV/persulfate oxidation were proposed as a result. In addition, the formation of DBP in the sequential chlorination was evaluated at different persulfate dosages, pH values, and water matrix. The results of this study can provide essential knowledge for the effective control of DBP formation with reducing potential hazard to provide safe drinking water to the public.
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Affiliation(s)
- Chen-Yan Hu
- College of Environmental and Chemical Engineering, Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai, People's Republic of China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai, People's Republic of China
| | - Cun Xiong
- College of Environmental and Chemical Engineering, Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai, People's Republic of China
| | - Yi-Li Lin
- Department of Safety, Health, and Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan, ROC
| | - Tian-Yang Zhang
- State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China
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Millan F, Hanik N. Degradation kinetics of medium chain length Polyhydroxyalkanoate degrading enzyme: a quartz crystal microbalance study. Front Bioeng Biotechnol 2023; 11:1303267. [PMID: 38162181 PMCID: PMC10756687 DOI: 10.3389/fbioe.2023.1303267] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 12/01/2023] [Indexed: 01/03/2024] Open
Abstract
This study investigates the enzymatic degradation processes of different classes of polyhydroxyalkanoates (PHAs), a group of biopolymers naturally synthesized by various microorganisms. Medium chain length PHAs (mcl-PHAs) are distinguished biopolymers due to their biodegradability and diverse material properties. Using quartz crystal microbalance measurements as a valuable tool for accurate real-time monitoring of the enzymatic degradation process, the research provides detailed kinetic data, describing the interaction between enzymes and substrates during the enzymatic degradation process. Thin films of poly-3-hydroxybutyrate (PHB) and polyhydroxyoctanoate copolymer (PHO), containing molar fractions of about 84% 3-hydroxyoctanoate and 16% 3-hydroxyhexanoate, were exposed to scl-depolymerases from Pseudomonas lemoignei LMG 2207 and recombinant mcl-depolymerase produced in Escherichia coli DH5α harboring the plasmid pMAD8, respectively. Analyses based on a heterogeneous kinetic model for the polymer degradation indicated a six-fold stronger adsorption equilibrium constant of mcl-depolymerase to PHO. Conversely, the degradation rate constant was approximately twice as high for scl-depolymerases acting on PHB. Finally, the study highlights the differences in enzyme-substrate interactions and degradation mechanisms between the investigated scl- and mcl-PHAs.
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Affiliation(s)
| | - Nils Hanik
- Institute of Life Technologies, School of Engineering, University of Applied Science and Arts Western Switzerland, Sion, Switzerland
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Xiang DH, Feng WH, Yi H, Li C, Cui QP, Liu XQ, Wang ZM, Xiao PG. [ Degradation kinetics of β-nicotinamide mononucleotide based on reliable HPLC quantitative method]. Zhongguo Zhong Yao Za Zhi 2023; 48:6635-6644. [PMID: 38212023 DOI: 10.19540/j.cnki.cjcmm.20230905.301] [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] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
To explore the stability characteristics of β-nicotinamide mononucleotide(NMN) and provide data support for NMN production, preparation, and related product development, this study established a simple HPLC content determination method for NMN in simple substrate and investigated the degradation behavior, degradation products, and degradation kinetics of NMN under various chemical, physical, and biological conditions. The HPLC method employed a Welch Xtimate AQ-C_(18) column(4.6 mm×250 mm, 5 μm), a detection wavelength of 266 nm, a column temperature of 30 ℃, a flow rate of 1.0 mL·min~(-1), an injection volume of 5 μL, and a mobile phase consisting of methanol(A) and a 10 mmol·L~(-1) ammonium formate aqueous solution(B) with a gradient elution(0-6.7 min, 0-4% A; 6.7-13 min, 4%-18% A; 13-14.2 min, 18% A; 14.2-15 min, 18%-0 A; 15-22 min, 0 A). This method provided good separation between NMN and potential impurities and degradation products, and had a wide linear range, short analysis time, good durability, high accuracy, an average sample recovery rate of 98.71%, and an RSD of 1.2%. The instrument precision had an RSD of 0.26%, and the linearity within the examined range was excellent(R~2≥0.999 9). This method can be applied for NMN content determination in simple substrate. The degradation process of NMN in aqueous solution followed apparent first-order kinetics, with the degradation rate primarily influenced by high temperature and pH. NMN was more stable in low-temperature, neutral, or weakly acidic/alkaline environments. Strong acids or strong alkalis could accelerate its degradation, and its degradation rate was less affected by pepsin and trypsin. In an aqueous solution at room temperature, it followed the kinetic equation lg C_t=0.005 7t + 4.817 2, with t_(0.9) and t_(1/2) values of 95.58, 860.26 h, respectively. The results suggest that pH and temperature are the main factors affecting the stability of NMN in aqueous solution, and low temperature, moisture protection, and a weakly acidic environment are more conducive to the storage and application of NMN and its products.
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Affiliation(s)
- Ding-Hua Xiang
- Tianjin University of Traditional Chinese Medicine Tianjin 301617, China National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Wei-Hong Feng
- National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Hong Yi
- National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Chun Li
- National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Qi-Ping Cui
- National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Xiao-Qian Liu
- National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Zhi-Min Wang
- National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Pei-Gen Xiao
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100193, China
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Chau J, Altan S, Burggraeve A, Coppenolle H, Kifle YW, Prokopcova H, Van Daele T, Sterckx H. A Bayesian Approach to Kinetic Modeling of Accelerated Stability Studies and Shelf Life Determination. AAPS PharmSciTech 2023; 24:250. [PMID: 38036798 DOI: 10.1208/s12249-023-02695-5] [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: 06/09/2023] [Accepted: 11/02/2023] [Indexed: 12/02/2023] Open
Abstract
Kinetic modeling of accelerated stability data serves an important purpose in the development of pharmaceutical products, providing support for shelf life claims and expediting the path to clinical implementation. In this context, a Bayesian kinetic modeling framework is considered, accommodating different types of nonlinear kinetics with temperature and humidity dependent rates of degradation and accounting for the humidity conditions within the packaging to predict the shelf life. In comparison to kinetic modeling based on nonlinear least-squares regression, the Bayesian approach allows for interpretable posterior inference, flexible error modeling and the opportunity to include prior information based on historical data or expert knowledge. While both frameworks perform comparably for high-quality data from well-designed studies, the Bayesian approach provides additional robustness when the data are sparse or of limited quality. This is illustrated by modeling accelerated stability data from two solid dosage forms and is further examined by means of artificial data subsets and simulated data.
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Affiliation(s)
| | - Stan Altan
- Statistics and Decision Sciences, Janssen Research, Raritan, New Jersey, USA
| | - Anneleen Burggraeve
- Chemical and Pharmaceutical Development & Supply, Janssen Research, Beerse, Belgium
| | - Hans Coppenolle
- Statistics and Decision Sciences, Janssen Research, Beerse, Belgium
| | | | - Hana Prokopcova
- Chemical and Pharmaceutical Development & Supply, Janssen Research, Beerse, Belgium
| | - Timothy Van Daele
- Chemical and Pharmaceutical Development & Supply, Janssen Research, Beerse, Belgium
| | - Hans Sterckx
- Chemical and Pharmaceutical Development & Supply, Janssen Research, Turnhoutseweg 30, 2340, Beerse, Belgium.
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Kovačević M, Živković S, Ognjanović M, Momčilović M, Relić D, Vasić Anićijević D. In Silico Guided Design of Metal/Semiconductor Photocatalysts: A Case of Cu-Modified TiO 2 for Ciprofloxacin Degradation. Materials (Basel) 2023; 16:5708. [PMID: 37629999 PMCID: PMC10456727 DOI: 10.3390/ma16165708] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 08/16/2023] [Accepted: 08/17/2023] [Indexed: 08/27/2023]
Abstract
(1) Background: An increasing use of pharmaceutics imposes a need for the permanent development of efficient strategies, including the tailoring of highly specific new materials for their removal from the environment. Photocatalytic degradation has been the subject of increasing interest of the researchers in the field. (2) Methods: This paper is focused on the investigation of the possibility to deposit a thin metal layer on a TiO2 surface and study its photocatalytic performance for the degradation of ciprofloxacin using a combination of theoretical and experimental methods. (3) Results: Based on the extensive DFT screening of 24 d-metals' adhesion on TiO2, Cu was selected for further work, due to the satisfactory expected stability and good availability. The (Cu)TiO2 was successfully synthesized and characterized with XRD, SEM+EDS and UV-Vis spectrophotometry. The uniformly distributed copper on the TiO2 surface corresponds to the binding on high-affinity oxygen-rich sites, as proposed with DFT calculations. The photocatalytic degradation rate of ciprofloxacin was improved by about a factor of 1.5 compared to the bare non-modified TiO2. (4) Conclusions: The observed result was ascribed to the ability of adsorbed Cu to impede the agglomeration of TiO2 and increase the active catalytic area, and bandgap narrowing predicted with DFT calculations.
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Affiliation(s)
- Marija Kovačević
- Vinča Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11351 Belgrade, Serbia
| | - Sanja Živković
- Vinča Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11351 Belgrade, Serbia
| | - Miloš Ognjanović
- Vinča Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11351 Belgrade, Serbia
| | - Miloš Momčilović
- Vinča Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11351 Belgrade, Serbia
| | - Dubravka Relić
- Faculty of Chemistry, University of Belgrade, Studentski Trg 12-14, 11158 Belgrade, Serbia
| | - Dragana Vasić Anićijević
- Vinča Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11351 Belgrade, Serbia
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7
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Schwalm MP, Krämer A, Dölle A, Weckesser J, Yu X, Jin J, Saxena K, Knapp S. Tracking the PROTAC degradation pathway in living cells highlights the importance of ternary complex measurement for PROTAC optimization. Cell Chem Biol 2023:S2451-9456(23)00157-5. [PMID: 37354907 DOI: 10.1016/j.chembiol.2023.06.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 04/03/2023] [Accepted: 06/01/2023] [Indexed: 06/26/2023]
Abstract
The multi-step degradation process of PROteolysis TArgeting Chimeras (PROTACs) poses a challenge for their rational development, as the rate-limiting steps that determine PROTACs efficiency remain largely unknown. Moreover, the slow throughput of currently used endpoint assays does not allow the comprehensive analysis of larger series of PROTACs. Here, we developed cell-based assays using the NanoLuciferase and HaloTag that allow measuring PROTAC-induced degradation and ternary complex formation kinetics and stability in cells. Using PROTACs developed for the degradation of WD40 repeat domain protein 5 (WDR5), the characterization of the mode of action of these PROTACs in the early degradation cascade revealed a key role of ternary complex formation and stability. Comparing a series of ternary complex crystal structures highlighted the importance of an efficient E3-target interface for ternary complex stability. The developed assays outline a strategy for the rational optimization of PROTACs using a series of live cell assays monitoring key steps of the early PROTAC-induced degradation pathway.
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Affiliation(s)
- Martin P Schwalm
- Institut für Pharmazeutische Chemie, Goethe-University Frankfurt, Biozentrum, Max-von-Laue-Str. 9, 60438 Frankfurt am Main, Germany; Structural Genomics Consortium, Goethe-University Frankfurt, Buchmann Institute for Life Sciences, Max-von-Laue-Str. 15, 60438 Frankfurt am Main, Germany
| | - Andreas Krämer
- Institut für Pharmazeutische Chemie, Goethe-University Frankfurt, Biozentrum, Max-von-Laue-Str. 9, 60438 Frankfurt am Main, Germany; Structural Genomics Consortium, Goethe-University Frankfurt, Buchmann Institute for Life Sciences, Max-von-Laue-Str. 15, 60438 Frankfurt am Main, Germany
| | - Anja Dölle
- Institut für Pharmazeutische Chemie, Goethe-University Frankfurt, Biozentrum, Max-von-Laue-Str. 9, 60438 Frankfurt am Main, Germany; Structural Genomics Consortium, Goethe-University Frankfurt, Buchmann Institute for Life Sciences, Max-von-Laue-Str. 15, 60438 Frankfurt am Main, Germany
| | - Janik Weckesser
- Institut für Pharmazeutische Chemie, Goethe-University Frankfurt, Biozentrum, Max-von-Laue-Str. 9, 60438 Frankfurt am Main, Germany; Structural Genomics Consortium, Goethe-University Frankfurt, Buchmann Institute for Life Sciences, Max-von-Laue-Str. 15, 60438 Frankfurt am Main, Germany
| | - Xufen Yu
- Mount Sinai Center for Therapeutics Discovery, Departments of Pharmacological Sciences, Oncological Sciences and Neuroscience, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Jian Jin
- Mount Sinai Center for Therapeutics Discovery, Departments of Pharmacological Sciences, Oncological Sciences and Neuroscience, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Krishna Saxena
- Institut für Pharmazeutische Chemie, Goethe-University Frankfurt, Biozentrum, Max-von-Laue-Str. 9, 60438 Frankfurt am Main, Germany; Structural Genomics Consortium, Goethe-University Frankfurt, Buchmann Institute for Life Sciences, Max-von-Laue-Str. 15, 60438 Frankfurt am Main, Germany
| | - Stefan Knapp
- Institut für Pharmazeutische Chemie, Goethe-University Frankfurt, Biozentrum, Max-von-Laue-Str. 9, 60438 Frankfurt am Main, Germany; Structural Genomics Consortium, Goethe-University Frankfurt, Buchmann Institute for Life Sciences, Max-von-Laue-Str. 15, 60438 Frankfurt am Main, Germany; German Cancer Consortium (DKTK)/German Cancer Research Center (DKFZ), DKTK site Frankfurt-Mainz, 69120 Heidelberg, Germany.
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Chandran Y, Thakur D, Raju Naik B, Balakrishnan V. Arresting the Surface Oxidation Kinetics of Bilayer 1T'-MoTe2 by Sulphur Passivation. Nanotechnology 2023. [PMID: 37311420 DOI: 10.1088/1361-6528/acddea] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
MoTe2 garnered much attention among 2D materials due to stable polymorphs with distinctive structural and electronic properties. Among the polymorphs, 1T'-MoTe2 in bulk form is type - II Weyl semimetal while, in monolayer form is a quantum spin Hall insulator. Thus, it is suitable for a wide variety of applications. Nevertheless, 1T'-MoTe2 degrades within a few hours when exposed to the atmosphere and causes hindrances in device fabrication. Here the degradation kinetics of CVD-synthesized 1T'-MoTe2 was investigated using Raman spectroscopy, XPS, and microscopic characterizations. The degradation rate of as-grown 1T'-MoTe2 obtained was 9.2 x 10-3 min-1. Further, we prevented the degradation of 1T'-MoTe2 by introducing a thin coating of S that encapsulates the flakes. 1T'-MoTe2 flakes showed stability for several days when covered using Sulphur, indicating 25 times enhanced structural stability.
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Affiliation(s)
- Yadu Chandran
- Indian Institute of Technology, IIT Mandi, Mandi, Mandi, Himachal Pradesh, 175005, INDIA
| | - Deepa Thakur
- Indian Institute of Technology, IIT Mandi, Mandi, Himachal Pradesh, 175005, INDIA
| | - B Raju Naik
- Indian Institute of Technology, IIT Mandi, Mandi, Himachal Pradesh, 175005, INDIA
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Jaiswal A, Tripathi A, Dubey SK. Biodegradation of fipronil: Molecular characterization, degradation kinetics, and metabolites. Res Sq 2023:rs.3.rs-2885549. [PMID: 37333229 PMCID: PMC10275034 DOI: 10.21203/rs.3.rs-2885549/v1] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/20/2023]
Abstract
Fipronil (C12H4Cl2F6N4OS), is a commonly used insecticide effective against numerous insects and pests. Its immense application poses harmful effects on various non-target organisms as well. Therefore, searching the effective methods for the degradation of fipronil is imperative and logical. In this study, fipronil-degrading bacterial species are isolated and characterized from diverse environments using a culture-dependent method followed by 16S rRNA gene sequencing. Phylogenetic analysis showed the homology of organisms with Acinetobacter sp., Streptomyces sp., Pseudomonas sp., Agrobacterium sp., Rhodococcus sp., Kocuria sp., Priestia sp., Bacillus sp., Pantoea sp. The bacterial degradation potential for fipronil was analyzed through High-Performance Liquid Chromatography. Incubation-based degradation studies revealed that Pseudomonas sp. and Rhodococcus sp. were found to be the most potent isolates that degraded fipronil at 100 mg L-1 concentration, with removal efficiencies of 85.97 % and 83.64 %, respectively. Kinetic parameter studies, following the Michaelis-Menten model, also revealed the high degradation efficiency of these isolates. Gas Chromatography-Mass Spectrometry (GC-MS) analysis revealed fipronil sulfide, benzaldehyde, (phenyl methylene) hydrazone, isomenthone, etc., as major metabolites of fipronil degradation. Overall investigation suggests that native bacterial species isolated from the contaminated environments could be efficiently utilized for the biodegradation of fipronil. The outcome derived from this study has immense significance in formulating an approach for bioremediation of fipronil-contaminated surroundings.
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Affiliation(s)
- Anjali Jaiswal
- Molecular Ecology Laboratory, Department of Botany, Institute of Science, Banaras Hindu, University, Varanasi, Uttar Pradesh-221005, India
| | - Animesh Tripathi
- Molecular Ecology Laboratory, Department of Botany, Institute of Science, Banaras Hindu, University, Varanasi, Uttar Pradesh-221005, India
| | - Suresh Kumar Dubey
- Molecular Ecology Laboratory, Department of Botany, Institute of Science, Banaras Hindu, University, Varanasi, Uttar Pradesh-221005, India
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Amer MM, Habib AA, Hammad SF, Kamal AH. Green micellar stability-indicating high-performance liquid chromatography method for determination of rupatadine fumarate in the presence of its main impurity desloratadine: Oxidative degradation kinetics study. J Sep Sci 2023:e2300135. [PMID: 37232201 DOI: 10.1002/jssc.202300135] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2023] [Revised: 04/10/2023] [Accepted: 05/10/2023] [Indexed: 05/27/2023]
Abstract
A green micellar stability-indicating high-performance liquid chromatography method was developed for rupatadine fumarate determination in existence with its main impurity desloratadine. Separation was attained using Hypersil ODS column (150 × 4.6 mm, 5 μm), the micellar mobile phase consisted of 0.13 M sodium dodecyl sulfate, 0.1 M disodium hydrogen phosphate adjusted by phosphoric acid to pH 2.8 and 10% n-butanol. The column was maintained at 45◦ C and detection was carried out at 267 nm. A linear response was achieved over the range of 2-160 μg/ml for rupatadine and 0.4-8 μg/ml for desloratadine. The method was applied for rupatadine determination in alergoliber tablets and alergoliber syrup without the interference of methyl paraben and propyl paraben present as main excipients. Rupatadine fumarate revealed pronounced susceptibility to oxidation; further study of oxidative degradation kinetics was carried out. Rupatadine was found to follow pseudo-first-order kinetics when exposed to 10% H2 O2 at 60 and 80°C and the activation energy was found to be 15.69 Kcal/mol. At a lower temperature (40°C), degradation kinetics regression was best fitted as a polynomial quadratic relationship, thus rupatadine oxidation at a lower temperature tends to adopt a second-order kinetics rate. Oxidative degradation product structure was revealed using infrared and found to be rupatadine N-oxide at all temperature values.
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Affiliation(s)
- Mona M Amer
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Tanta University, Tanta, Egypt
| | - Ahmed A Habib
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Tanta University, Tanta, Egypt
| | - Sherin F Hammad
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Tanta University, Tanta, Egypt
| | - Amira H Kamal
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Tanta University, Tanta, Egypt
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Gonzalez-Ortega R, Di Mattia CD, Pittia P, Natasa PU. Effect of heat treatment on phenolic composition and radical scavenging activity of olive leaf extract at different pH conditions: a spectroscopic and kinetic study. J Sci Food Agric 2023; 103:2047-2056. [PMID: 36461135 DOI: 10.1002/jsfa.12371] [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] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 09/21/2022] [Accepted: 12/03/2022] [Indexed: 06/17/2023]
Abstract
BACKGROUND The present study focused on the effect of isothermal treatment (5-90 °C) and pH (2.0-6.0) of aqueous olive leaf phenolic extract solutions on the kinetics of degradation of single and total phenolic compounds and radical scavenging activity, with the objective of predicting and optimizing the thermal treatments in foods enriched with olive leaf extracts. RESULTS The major compound, oleuropein, showed higher degradation at low pH 2.0 and temperature-dependent reaction rates, which fitted well a first-order kinetic model, with an estimated activation energy of 98.03 ± 0.08 kJ mol-1 . Oleuropein hydrolysis resulted in a zero-order increase in hydroxytyrosol concentration at same pH (Ea = 71.59 ± 1.5 kJ mol-1 ), whereas a 100-fold slower degradation rate was observed at higher pH. Verbascoside was only degraded at pH 6.0, also following first-order kinetics. These changes in oleuropein and hydroxytyrosol concentrations led to significant changes in fluorescence maximum intensities centered around 315 and 360 nm and in the 425-500 nm spectral zone for samples at pH 6.0, which could be associated with verbacoside degradation. Conversely, analysis of total phenolic content and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging activity showed little changes, indicating a rather constant overall reducing capacity of the resulting pool of compounds after thermal treatments. CONCLUSION The present study can contribute to the knowledge related to oleuropein and phenolic fraction degradation as a result of matrix (pH) and processing. The kinetic parameters obtained could be applied for predicting and optimizing the thermal treatments in foods and drinks enriched with olive leaf extracts. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Rodrigo Gonzalez-Ortega
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Carla Daniela Di Mattia
- Faculty of Bioscience and Technology for Food Agriculture and Environment, University of Teramo, Teramo, Italy
| | - Paola Pittia
- Faculty of Bioscience and Technology for Food Agriculture and Environment, University of Teramo, Teramo, Italy
| | - Poklar Ulrih Natasa
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
- The Centre of Excellence for Integrated Approaches in Chemistry and Biology of Proteins (CipKeBiP), Ljubljana, Slovenia
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12
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Zhang Y, Guo L, Hoffmann MR. Ozone- and Hydroxyl Radical-Mediated Oxidation of Pharmaceutical Compounds Using Ni-Doped Sb-SnO 2 Anodes: Degradation Kinetics and Transformation Products. ACS ES T Eng 2023; 3:335-348. [PMID: 36935895 PMCID: PMC10012175 DOI: 10.1021/acsestengg.2c00337] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 06/18/2023]
Abstract
Electrochemical oxidation provides a versatile technique for treating wastewater streams onsite. We previously reported that a two-layer heterojunction Ni-Sb-SnO2 anode (NAT/AT) can produce both ozone (O3) and hydroxyl radical (•OH). In this study, we explore further the applicability of NAT/AT anodes for oxidizing pharmaceutical compounds using carbamazepine (CBZ) and fluconazole (FCZ) as model probe compounds. Details of the oxidation reaction kinetics and subsequent reaction products are investigated in the absence and presence of chloride (Cl-) and sulfate (SO4 2-). In all cases, faster or comparable degradation kinetics of CBZ and FCZ are achieved using the double-layered NAT/AT anode coupled with a stainless steel (SS) cathode in direct comparison to an identical setup using a boron-doped diamond anode. Production of O3 on NAT/AT enhances the elimination of both parent compounds and their transformation products (TPs). Very fast CBZ degradation is observed during NAT/AT-SS electrolysis in both NaClO4 and NaCl electrolytes. However, more reaction products are identified in the presence of Cl- than ClO4 - (23 TPs vs 6). Rapid removal of FCZ is observed in NaClO4, while the degradation rate is retarded in NaCl depending on the [Cl-]. In SO4 2--containing electrolytes, altered reaction pathways and transformation product distributions are observed due to sulfate radical generation. SO4 ·- oxidation produces fewer hydroxylated products and promotes the oxidation of aldehydes to carboxylic acids. Similar trend in treatment performance is observed in mixtures of CBZ and FCZ with other pharmaceutical compounds in latrine wastewater and secondary WWTP effluent.
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Affiliation(s)
- Yi Zhang
- Linde
Laboratories, California Institute of Technology, Pasadena, California91125, United States
| | - Lei Guo
- Linde
Laboratories, California Institute of Technology, Pasadena, California91125, United States
- Department
of Civil Engineering, University of Arkansas, Fayetteville, Arkansas72701, United States
| | - Michael R. Hoffmann
- Linde
Laboratories, California Institute of Technology, Pasadena, California91125, United States
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13
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Jia Q, Cai Y, Yuan X, Li B, Li B. The Degradation Process of Typical Neonicotinoid Insecticides in Tidal Streams in Subtropical Cities: A Case Study of the Wuchong Stream, South China. Toxics 2023; 11:203. [PMID: 36976968 PMCID: PMC10057386 DOI: 10.3390/toxics11030203] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 01/31/2023] [Accepted: 02/02/2023] [Indexed: 06/18/2023]
Abstract
Neonicotinoid insecticides (NEOs) are commonly used to prevent unwanted insects in urban fields. Degradation processes have been one of the important environmental behaviors of NEOs in an aquatic environment. In this research, hydrolysis, biodegradation, and photolysis processes of four typical NEOs (i.e., thiacloprid (THA), clothianidin (CLO), acetamiprid (ACE), and imidacloprid (IMI)) were examined through the adoption of response surface methodology-central composite design (RSM-CCD) for an urban tidal stream in South China. The influences of multiple environmental parameters and concentration levels on the three degradation processes of these NEOs were then evaluated. The results indicated that the three degradation processes of the typical NEOs followed a pseudo-first-order reaction kinetics model. The primary degradation process of the NEOs were hydrolysis and photolysis processes in the urban stream. The hydrolysis degradation rate of THA was the highest (1.97 × 10-5 s-1), and that of CLO was the lowest (1.28 × 10-5 s-1). The temperature of water samples was the main environmental factor influencing the degradation processes of these NEOs in the urban tidal stream. Salinity and humic acids could inhibit the degradation processes of the NEOs. Under the influence of extreme climate events, the biodegradation processes of these typical NEOs could be suppressed, and other degradation processes could be further accelerated. In addition, extreme climate events could pose severe challenges to the migration and degradation process simulation of NEOs.
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Affiliation(s)
- Qunpo Jia
- Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, China
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China
| | - Yanpeng Cai
- Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, China
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China
| | - Xiao Yuan
- Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, China
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China
| | - Bowen Li
- Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, China
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China
| | - Bo Li
- Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, China
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China
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14
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Liu XH, Bai FY, Meng TT, Ni S, Zhao Z. Theoretical Study of the Hydroxyl-Radical-Initiated Degradation Mechanism, Kinetics, and Subsequent Evolution of Methyl and Ethyl Iodides in the Atmosphere. Chemphyschem 2023; 24:e202300021. [PMID: 36781393 DOI: 10.1002/cphc.202300021] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 02/10/2023] [Accepted: 02/13/2023] [Indexed: 02/15/2023]
Abstract
The degradation and transformation of iodinated alkanes are crucial in the iodine chemical cycle in the marine boundary layer. In this study, MP2 and CCSD(T) methods were adopted to study the atmospheric transformation mechanism and degradation kinetic properties of CH3 I and CH3 CH2 I mediated by ⋅OH radical. The results show that there are three reaction mechanisms including H-abstraction, I-substitution and I-abstraction. The H-abstraction channel producing ⋅CH2 I and CH3 C ⋅ HI radicals are the main degradation pathways of CH3 I and CH3 CH2 I, respectively. By means of the variational transition state theory and small curvature tunnel correction method, the rate constants and branching ratios of each reaction are calculated in the temperature range of 200-600 K. The results show that the tunneling effect contributes more to the reaction at low temperatures. Theoretical reaction rate constants of CH3 I and CH3 CH2 I with ⋅OH are calculated to be 1.42×10-13 and 4.44×10-13 cm3 molecule-1 s-1 at T=298 K, respectively, which are in good agreement with the experimental values. The atmospheric lifetimes of CH3 I and CH3 CH2 I are evaluated to be 81.51 and 26.07 day, respectively. The subsequent evolution mechanism of ⋅CH2 I and CH3 C ⋅ HI in the presence of O2 , NO and HO2 indicates that HCHO, CH3 CHO, and I-atom are the main transformation end-products. This study provides a theoretical basis for insight into the diurnal conversion and environmental implications of iodinated alkanes.
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Affiliation(s)
- Xiang-Huan Liu
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, 110034, People's Republic of China
| | - Feng-Yang Bai
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, 110034, People's Republic of China
| | - Ting-Ting Meng
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, 110034, People's Republic of China
| | - Shuang Ni
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, 110034, People's Republic of China
| | - Zhen Zhao
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, 110034, People's Republic of China.,State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, People's Republic of China
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15
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Fu Y, McClements DJ, Luo S, Ye J, Liu C. Degradation kinetics of rutin encapsulated in oil-in-water emulsions: impact of particle size. J Sci Food Agric 2023; 103:770-778. [PMID: 36053972 DOI: 10.1002/jsfa.12188] [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] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Revised: 08/21/2022] [Accepted: 08/25/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Rutin is a natural bioactive flavonoid that is poor in water solubility and chemical stability. Encapsulation can be used to protect bioactive molecules from chemical or physical decomposition during food processing and storage. Thus, the effect of initial particle size on the ability of oil-in-water emulsions to retain rutin during storage was investigated. RESULTS Rutin was encapsulated in oil-in-water emulsions with different mean surface-weighted diameters: d3,2 = 0.56 μm (small), 0.73 μm (medium), and 2.32 μm (large). As expected, the resistance of the emulsions to coalescence and creaming during storage increased as the particle size decreased due to weakening of the colloidal and gravitational forces acting on the droplets. The concentration of rutin in the emulsions decreased during storage (28 days), which was mainly attributed to photodegradation of the flavonoid. The loss of rutin from the emulsions during storage was fitted using a second-order equation. The rutin degradation rate constant k decreased and the half-life t1/2 increased with decreasing droplet size, which was attributed to the stronger encapsulation and light scattering by smaller oil droplets reducing the amount of light that can penetrate into the emulsions. CONCLUSION This study has important implications for the design of more efficacious emulsion-based delivery systems for incorporating health-promoting nutraceuticals into foods. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Yuteng Fu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - David Julian McClements
- Biopolymers and Colloids Research Laboratory, Department of Food Science, University of Massachusetts Amherst, Amherst, MA, USA
| | - Shunjing Luo
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Jiangping Ye
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Chengmei Liu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
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16
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Draz ME, El Wasseef D, El Enany N, Wahba MEK. Green approach for tracking the photofate of ciprofloxacin and levofloxacin in different matrices adopting synchronous fluorescence spectroscopy: a kinetic study. R Soc Open Sci 2023; 10:221086. [PMID: 36686550 PMCID: PMC9845973 DOI: 10.1098/rsos.221086] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 10/26/2022] [Indexed: 06/17/2023]
Abstract
First derivative synchronous fluorescence spectroscopy (FDSFS) was applied to detect and quantify either ciprofloxacin (CIP) or levofloxacin (LEV) simultaneously with their photodegradation products, where the photolytic pathway for each analyte was found to be pH dependent. Under the guidance of early published articles, the structure of the produced photolytic products could be concluded, and further related to their resultant fluorescence spectra. The proposed method was subjected to full validation procedure which enables its application in investigating the photodegradation kinetics for both drugs. The obtained kinetic parameters were in accordance with previous reports and could be linked to predict the antibacterial activity of the resultant photodegradation products. These facts prove the suitability of the suggested FDSFS to serve as a stability-indicating assay method and to trace the photofate of CIP and LEV in the ecosystem as potential contaminants. Furthermore, the greenness of the suggested analytical methodology was evaluated via 'Green Analytical Procedure Index' (GAPI), which classifies it as an eco-friendly assay. Eventually, no extraction, treatment or preparation steps were needed during all analysis steps, which renders the proposed assay an appealing tool in environmental analysis.
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Affiliation(s)
- Mohammed E. Draz
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa 11152, Egypt
| | - Dalia El Wasseef
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa 11152, Egypt
- Department of Medicinal Chemistry, Mansoura University, Mansoura 35516, Egypt
| | - Nahed El Enany
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, New Mansoura University, P.O. Box 7723730, New Mansoura, Egypt
| | - Mary E. K. Wahba
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa 11152, Egypt
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
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17
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Liu Q, Wen M, Guo Y, Song S, Li G, An T. Efficient Catalytic Combustion of Cyclohexane over PdAg/Fe 2O 3 Catalysts under Low-Temperature Conditions: Establishing the Degradation Mechanism Using PTR-TOF-MS and in Situ DRIFTS. ACS Appl Mater Interfaces 2022; 14:55503-55516. [PMID: 36456474 DOI: 10.1021/acsami.2c14515] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Cyclohexane, a typical volatile organic compound (VOC), poses high risks to the environment and humans. Herein, synthesized PdAg/Fe2O3 catalysts exhibited exceptional catalytic performance for cyclohexane combustion at lower temperatures (50% mineralization temperature (T50) of 199 °C, 90% mineralization temperature (T90) of 315 °C) than Pd/Fe2O3 (T50 of 262 °C, T90 of 335 °C) and Fe2O3 (T50 of 305 °C, T90 of 360 °C). In addition, PdAg/Fe2O3 displayed enhanced stability by alloying Ag with Pd. The redox and acidity of the PdAg/Fe2O3 were studied by XPS, H2-TPR, and NH3-TPD. In situ diffuse reflectance infrared Fourier transform spectroscopy and proton-transfer-reaction time-of-flight mass spectrometry were applied to identify the intermediates formed on the catalyst surface and in the tail gas during oxidation, respectively. Results suggested that loading PdAg onto Fe2O3 significantly enhanced the adsorption and activation of oxygen and cyclohexane, oxidative dehydrogenation of cyclohexane to benzene, and catalytic cracking of cyclohexane to olefins at low temperatures. This in-depth study will benefit the design and application of efficient catalysts for the effective combustion of VOCs at low temperatures.
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Affiliation(s)
- Qiuxia Liu
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou510006, China
- Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, China
| | - Meicheng Wen
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou510006, China
- Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, China
| | - Yunlong Guo
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou510006, China
- Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, China
| | - Shengnan Song
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou510006, China
- Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, China
| | - Guiying Li
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou510006, China
- Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, China
| | - Taicheng An
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou510006, China
- Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, China
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18
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Piotrowicz-Cieślak AI, Maciejczyk M, Margas M, Rydzyński D, Grajek H, Michalczyk DJ, Wasilewski J, Smyk B. Studies on the Efficiency of Iron Release from Fe(III)-EDTA and Fe(III)-Cit and the Suitability of These Compounds for Tetracycline Degradation. Molecules 2022; 27:molecules27238498. [PMID: 36500591 PMCID: PMC9739602 DOI: 10.3390/molecules27238498] [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] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 11/21/2022] [Accepted: 11/25/2022] [Indexed: 12/07/2022]
Abstract
Iron ions can be used to degrade tetracycline dispersed in nature. Studies of absorption and fluorescence spectra and quantum chemistry calculations showed that iron is more readily released from Fe(III)-citrate than from Fe(III)-EDTA, so Fe(III)-citrate (Fe(III)-Cit) is more suitable for tetracycline (TC) degradation. At 30 °C, a severe degradation of TC by Fe(III)-Cit occurred as early as after 3 days of incubation in the light, and after 5 days in the dark. In contrast, the degradation of TC by Fe(III)-EDTA proceeded very slowly in the dark. By the fifth day of incubation of TC with Fe(III)-Cit in darkness, the concentrations of the former compound dropped by 55% and 75%, at 20 °C and 30 °C, respectively. The decrease in tetracycline concentrations caused by Fe(III)-EDTA in darkness at the same temperatures was only 2% and 6%, respectively. Light increased the degradation rates of TC by Fe(III)-EDTA to 20% and 56% at 20 °C and 30 °C, respectively. The key role of the light in the degradation of tetracycline by Fe(III)-EDTA was thus demonstrated. The TC degradation reaction showed a second-order kinetics. The rate constants of Fe(III)-Cit-induced TC degradation at 20 °C and 30 °C in darkness were k = 4238 M-1day-1 and k = 11,330 M-1day-1, respectively, while for Fe(III)-EDTA were 55 M-1day-1 and 226 M-1day-1. In light, these constants were k = 15,440 M-1day-1 and k = 40,270 M-1day-1 for Fe(III)-Cit and k = 1012 M-1day-1 and 2050 M-1day-1 at 20 °C and 30 °C; respectively. A possible reason for the higher TC degradation rate caused by Fe(III)-Cit can be the result of its lower thermodynamical stability compared with Fe(III)-EDTA, which we confirmed with our quantum chemistry calculations. Two quantum chemistry calculations showed that the iron complex with EDTA is more stable (the free energy of the ensemble is 15.8 kcal/mol lower) than the iron complex with Cit; hence, Fe release from Fe(III)-EDTA is less effective.
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Affiliation(s)
- Agnieszka I. Piotrowicz-Cieślak
- Department of Plant Physiology, Genetics and Biotechnology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 1A, 10-718 Olsztyn, Poland
- Correspondence:
| | - Maciej Maciejczyk
- Department of Physics and Biophysics, Faculty of Food Science, University of Warmia and Mazury in Olsztyn, Oczapowskiego 4, 10-719 Olsztyn, Poland
| | - Małgorzata Margas
- Department of Plant Physiology, Genetics and Biotechnology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 1A, 10-718 Olsztyn, Poland
| | - Dariusz Rydzyński
- Department of Plant Physiology, Genetics and Biotechnology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 1A, 10-718 Olsztyn, Poland
| | - Hanna Grajek
- Department of Physics and Biophysics, Faculty of Food Science, University of Warmia and Mazury in Olsztyn, Oczapowskiego 4, 10-719 Olsztyn, Poland
| | - Dariusz J. Michalczyk
- Department of Plant Physiology, Genetics and Biotechnology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 1A, 10-718 Olsztyn, Poland
| | - Janusz Wasilewski
- Department of Biochemistry, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 1A, 10-718 Olsztyn, Poland
| | - Bogdan Smyk
- Department of Physics and Biophysics, Faculty of Food Science, University of Warmia and Mazury in Olsztyn, Oczapowskiego 4, 10-719 Olsztyn, Poland
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19
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Xu Y, Jia Z, Wang J, Sun J, Song R. Property and Stability of Astaxanthin Emulsion Based on Pickering Emulsion Templating with Zein and Sodium Alginate as Stabilizer. Int J Mol Sci 2022; 23:9386. [PMID: 36012651 PMCID: PMC9408833 DOI: 10.3390/ijms23169386] [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: 07/10/2022] [Revised: 08/13/2022] [Accepted: 08/16/2022] [Indexed: 11/28/2022] Open
Abstract
Astaxanthin loaded Pickering emulsion with zein/sodium alginate (SA) as a stabilizer (named as APEs) was developed, and its structure and stability were characterized. The encapsulation efficiency of astaxanthin (Asta) in APEs was up to 86.7 ± 3.8%, with a mean particle size of 4.763 μm. Freeze-dried APEs showed particles stacked together under scanning electronic microscope; whereas dispersed spherical nanoparticles were observed in APEs dilution under transmission electron microscope images. Confocal laser scanning microscope images indicated that zein particles loaded with Asta were aggregated with SA coating. X-ray diffraction patterns and Fourier transform infrared spectra results showed that intermolecular hydrogen bonding, electrostatic attraction and hydrophobic effect were involved in APEs formation. APEs demonstrated non-Newtonian shear-thinning behavior and fit well to the Cross model. Compared to bare Asta extract, APEs maintained high Asta retention and antioxidant activity when heated from 50 to 10 °C. APEs showed different stability at pH (3.0-11.0) and Na+, K+, Ca2+, Cu2+ and Fe2+ conditions by visual, zeta potential and polydispersity index measurements. Additionally, the first order kinetics fit well to describe APEs degradation at pH 3.0 to 9.0, Na+, and K+ conditions. Our results suggest the potential application of Asta-loaded Pickering emulsion in food systems as a fortified additive.
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Affiliation(s)
- Yan Xu
- Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province, School of Food Science and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, China
| | - Zhe Jia
- Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province, School of Food Science and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, China
| | - Jiaxing Wang
- Research Office of Marine Biological Resources Utilization and Development, Zhejiang Marine Development Research Institute, Zhoushan 316021, China
| | - Jipeng Sun
- Research Office of Marine Biological Resources Utilization and Development, Zhejiang Marine Development Research Institute, Zhoushan 316021, China
| | - Ru Song
- Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province, School of Food Science and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, China
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20
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Mazhar H, Shehzad F, Hong SG, Al-Harthi MA. Thermal Degradation Kinetics Analysis of Ethylene-Propylene Copolymer and EP-1-Hexene Terpolymer. Polymers (Basel) 2022; 14:polym14030634. [PMID: 35160623 PMCID: PMC8839618 DOI: 10.3390/polym14030634] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 01/21/2022] [Accepted: 01/25/2022] [Indexed: 02/01/2023] Open
Abstract
LLDPE is a less crystalline polymer with vast industrial and domestic applications. It is imperative to understand the synthesis, processing conditions, and thermal degradation mechanism of the co- as well as terpolymers. This paper reports the in-situ synthesis and thermal degradation studies of the ethylene-propylene copolymer and ethylene-propylene-1-hexene terpolymer and its nanocomposite with ZnAL LDH sheets. The 1-hexene dosing during the in-situ process influenced the product yield and immensely affected the thermal stability of the resultant polymer. One milliliter 1-hexene in-situ addition increased the product yield by 170 percent, while the temperature at 10 percent weight loss in TGA was dropped by about 60 °C. While only 0.3 weight percent ZnAL LDH addition in the terpolymer improved the thermal stability by 10 °C. A master plot technique and combined kinetics analysis (CKA) were deployed to access the thermal degradation mechanism of the synthesized polymers.
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Affiliation(s)
- Hassam Mazhar
- Department of Chemical Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia; (H.M.); (F.S.)
| | - Farrukh Shehzad
- Department of Chemical Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia; (H.M.); (F.S.)
| | | | - Mamdouh A. Al-Harthi
- Department of Chemical Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia; (H.M.); (F.S.)
- Center for Refining and Advance Chemicals, The Research Institute, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
- Correspondence:
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Sousa D, Basílio N, Oliveira J, de Freitas V, Pina F. A New Insight into the Degradation of Anthocyanins: Reversible versus the Irreversible Chemical Processes. J Agric Food Chem 2022; 70:656-668. [PMID: 34982560 DOI: 10.1021/acs.jafc.1c06521] [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] [Indexed: 06/14/2023]
Abstract
The kinetics and thermodynamics of the pH-dependent reversible and irreversible processes leading to color fading of pelargonidin-3-O-glucoside, peonidin-3-O-glucoside, malvidin-3-O-glucoside, and cyanidin-3-O-glucoside dyes in aqueous solutions are reported. Following the addition of base to the flavylium cation, the quinoidal bases disappear by three distinct steps: (i) in an acidic medium by a biexponential process, in which the faster step is controlled by the hydration reaction and the slower one by cis-trans isomerization; the degradation process occurs essentially from the anionic quinoidal base; (ii) in a basic medium (pH > 9.5), in which the disappearance of the anionic bases is monoexponential, with the rate proportional to the hydroxyl concentration (hydroxyl attack), leading to anionic chalcones (cis and trans) at equilibrium─the slower degradation step occurs from the di- and trianionic chalcones; and (iii) in the pH region circa 7.7 < pH < 9.5, in which hydration and hydroxyl attacks are much slower than anionic quinoidal base degradation (which is the rate-controlling step) and the equilibrium cannot be attained.
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Affiliation(s)
- Diogo Sousa
- iBB─Institute for Bioengineering and Biosciences and Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
- Área Departamental de Engenharia Química, Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, R. Conselheiro Emídio Navarro, 1, 1959-007 Lisboa, Portugal
| | - Nuno Basílio
- Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Joana Oliveira
- LAQV─REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - Victor de Freitas
- LAQV─REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - Fernando Pina
- Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
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Gharanjig H, Iri M, Hosseinnezhad M, Gharanjig K, Jafari SM. Enhanced thermal stability of anthocyanins through natural polysaccharides from Angum gum and cress seed gum. J Food Sci 2022; 87:585-598. [PMID: 34997936 DOI: 10.1111/1750-3841.16016] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Revised: 11/17/2021] [Accepted: 11/23/2021] [Indexed: 11/30/2022]
Abstract
Enhanced thermal stability of anthocyanins from black barberry was obtained using an optimum concentration of Angum gum (AG) and cress seed gum (CSG). To this goal initially, the phytochemical characteristics, and the thermal stability of purified and non-purified anthocyanins were investigated to perceive the effect of the purification process. Then the effect of each gum and its concentration was evaluated on the thermal degradation kinetics of anthocyanins. Results demonstrated that both gums enhanced the thermal stability of anthocyanins, while CSG had a superior effect. Findings also revealed that the half-life of anthocyanin was increased at 60°C from 366 ± 22.8 to 432 ± 4.2 and 636 ± 52.8 min in presence of AG and CSG, respectively. TGA results confirmed that the presence of SF-AG and CSG in their optimum concentration enhanced the heat stability of anthocyanin extract. Also, physical molecular bondings were confirmed by the FTIR spectrums where some peaks attributed to both of the extract and the gums were shifted. Plateau or flake-like micro-particles were detected by SEM which correspond with the most freeze-dried microcapsules. PRACTICAL APPLICATION: The results of this study may contribute to the enhanced thermal stability of anthocyanins from barberry that can be used as a coloring agent in beverage and food systems. Moreover, it can be used in preparation of natural nutraceuticals and pharmaceuticals.
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Affiliation(s)
- Hamid Gharanjig
- Department of Organic Colorants, Institute for Color Science and Technology, Tehran, Iran
| | - Marjan Iri
- Department of Organic Colorants, Institute for Color Science and Technology, Tehran, Iran
| | - Mozhgan Hosseinnezhad
- Department of Organic Colorants, Institute for Color Science and Technology, Tehran, Iran.,Center of Excellence for Color Science and Technology, Institute for Color Science and Technology, Tehran, Iran
| | - Kamaladin Gharanjig
- Department of Organic Colorants, Institute for Color Science and Technology, Tehran, Iran.,Center of Excellence for Color Science and Technology, Institute for Color Science and Technology, Tehran, Iran
| | - Seid Mahdi Jafari
- Department of Food Materials and Process Design Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
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Alj I, Quiertant M, Khadour A, Grando Q, Benzarti K. Environmental Durability of an Optical Fiber Cable Intended for Distributed Strain Measurements in Concrete Structures. Sensors (Basel) 2021; 22:s22010141. [PMID: 35009683 PMCID: PMC8747727 DOI: 10.3390/s22010141] [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] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/20/2021] [Accepted: 12/23/2021] [Indexed: 11/17/2022]
Abstract
The present study investigates the environmental durability of a distributed optical fiber sensing (DOFS) cable on the market, commonly used for distributed strain measurements in reinforced concrete structures. An extensive experimental program was conducted on different types of specimens (including samples of bare DOFS cable and plain concrete specimens instrumented with this DOFS cable) that were exposed to accelerated and natural ageing (NA) conditions for different periods of up to 18 months. The instrumentation of both concrete specimens consisted of DOFS cables embedded at the center of the specimens and bonded at the concrete surface, as these two configurations are commonly deployed in the field. In these configurations, the alkalinity of the surrounding cement medium and the outdoor conditions are the main factors potentially affecting the characteristics of the DOFS component materials and the integrity of the various interfaces, and hence impacting the strain transfer process between the host structure and the core optical fiber (OF). Therefore, immersion in an alkaline solution at an elevated temperature or freeze/thaw (F/T) and immersion/drying (I/D) cycles were chosen as accelerated ageing conditions, depending on the considered configuration. Mechanical characterizations by tensile and pull-out tests were then carried out on the exposed specimens to assess the evolution of the mechanical properties of individual component materials as well as the evolution of bond properties at various interfaces (internal interfaces of the DOFS cable, and interface between the cable and the host structure) during ageing. Complementary physico-chemical characterizations were also performed to better understand the underlying degradation processes. The experimental results highlight that immersion in the alkaline solution induced a significant and rapid decrease in the bond properties at internal interfaces of the DOFS cable and at the cable/concrete interface (in the case of the embedded cable configuration), which was assigned to chemical degradation at the surface of the cable coating in contact with the solution (hydrolysis and thermal degradation of the EVA copolymer component). Meanwhile, F/T and I/D cycles showed more limited effects on the mechanical properties of the component materials and interfaces in the case of the bonded cable configuration. A comparison with the same specimens exposed to outdoor NA suggested that the chosen accelerated ageing conditions may not be totally representative of actual service conditions, but provided indications for improving the ageing protocols in future research. In the last part, an analysis of the distributed strain profiles collected during pull-out tests on instrumented concrete specimens clearly illustrated the consequences of ageing processes on the strain response of the DOFS cable.
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Affiliation(s)
- Ismail Alj
- Matériaux et Structures (MAST) Department, Expérimentation et Modélisation pour le Génie Civil et Urbain (EMGCU), University Gustave Eiffel—Institut Français des Sciences et Technologies des Transports, de l’Aménagement et des Réseaux (IFSTTAR), F-77447 Marne-la-Vallée, France;
- Correspondence: (I.A.); (K.B.)
| | - Marc Quiertant
- Matériaux et Structures (MAST) Department, Expérimentation et Modélisation pour le Génie Civil et Urbain (EMGCU), University Gustave Eiffel—Institut Français des Sciences et Technologies des Transports, de l’Aménagement et des Réseaux (IFSTTAR), F-77447 Marne-la-Vallée, France;
| | - Aghiad Khadour
- Composants et Systèmes (COSYS) Department, Laboratoire Instrumentation, Simulation et Informatique Scientifique (LISIS), University Gustave Eiffel—Institut Français des Sciences et Technologies des Transports, de l’Aménagement et des Réseaux (IFSTTAR), F-77447 Marne-la-Vallée, France;
| | - Quentin Grando
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), CEDEX, 13115 Saint-Paul-Lez-Durance, France;
| | - Karim Benzarti
- Lab Navier, University Gustave Eiffel, Ecole Nationale des Ponts et Chaussées (ENPC), Centre National de la Recherche Scientifique (CNRS), F-77447 Marne la Vallée, France
- Correspondence: (I.A.); (K.B.)
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Ferkous H, Kerboua K, Hamdaoui O, Haddour N, Alghyamah A. Galvano-Fenton Engineering Solution with Spontaneous Catalyst's Generation from Waste: Experimental Efficiency, Parametric Analysis and Modeling Interpretation Applied to a Clean Technology for Dyes Degradation in Water. Molecules 2021; 26:5640. [PMID: 34577112 PMCID: PMC8466290 DOI: 10.3390/molecules26185640] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 08/28/2021] [Accepted: 09/13/2021] [Indexed: 12/02/2022] Open
Abstract
In this paper, the degradation of the diazo dye naphthol blue black (NBB) using the Galvano-Fenton process is studied experimentally and numerically. The simulations are carried out based on the anodic, cathodic, and 34 elementary reactions evolving in the electrolyte, in addition to the oxidative attack of NBB by HO• at a constant rate of 3.35×107 mol-1·m3·s-1 during the initiation stage of the chain reactions. The selection of the operating conditions including the pH of the electrolyte, the stirring speed, and the electrodes disposition is performed by assessing the kinetics of NBB degradation; these parameters are set to 3, 350 rpm and a parallel disposition with a 3 cm inter-electrode distance, respectively. The kinetics of Fe(III) in the electrolyte were monitored using the principles of Fricke dosimetry and simulated numerically. The model showed more than a 96% correlation with the experimental results in both the blank test and the presence of the dye. The effects of H2O2 and NBB concentrations on the degradation of the dye were examined jointly with the evolution of the simulated H2O2, Fe2+, and HO• concentrations in the electrolyte. The model demonstrated a good correlation with the experimental results in terms of the initial degradation rates, with correlation coefficients exceeding 98%.
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Affiliation(s)
- Hamza Ferkous
- Laboratory of Environmental Engineering, Process Engineering Department, Faculty of Engineering, Badji Mokhtar—Annaba University, P.O. Box 12, Annaba 23000, Algeria; (H.F.); (K.K.)
| | - Kaouther Kerboua
- Laboratory of Environmental Engineering, Process Engineering Department, Faculty of Engineering, Badji Mokhtar—Annaba University, P.O. Box 12, Annaba 23000, Algeria; (H.F.); (K.K.)
- Department of Second Cycle, Higher School of Industrial Technologies, P.O. Box 218, Annaba 23000, Algeria
| | - Oualid Hamdaoui
- Laboratory of Environmental Engineering, Process Engineering Department, Faculty of Engineering, Badji Mokhtar—Annaba University, P.O. Box 12, Annaba 23000, Algeria; (H.F.); (K.K.)
- Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia;
| | - Naoufel Haddour
- Laboratoire Ampère, École Centrale de Lyon, 36 Avenue Guy de Collongue, 69134 Écully, France;
| | - Abdulaziz Alghyamah
- Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia;
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Diao E, Ma K, Zhang H, Xie P, Qian S, Song H, Mao R, Zhang L. Thermal Stability and Degradation Kinetics of Patulin in Highly Acidic Conditions: Impact of Cysteine. Toxins (Basel) 2021; 13:662. [PMID: 34564666 DOI: 10.3390/toxins13090662] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 09/12/2021] [Accepted: 09/14/2021] [Indexed: 01/09/2023] Open
Abstract
The thermal stability and degradation kinetics of patulin (PAT, 10 μmol/L) in pH 3.5 of phosphoric-citric acid buffer solutions in the absence and presence of cysteine (CYS, 30 μmol/L) were investigated at temperatures ranging from 90 to 150 °C. The zero-, first-, and second-order models and the Weibull model were used to fit the degradation process of patulin. Both the first-order kinetic model and Weibull model better described the degradation of patulin in the presence of cysteine while it was complexed to simulate them in the absence of cysteine with various models at different temperatures based on the correlation coefficients (R2 > 0.90). At the same reaction time, cysteine and temperature significantly affected the degradation efficiency of patulin in highly acidic conditions (p < 0.01). The rate constants (kT) for patulin degradation with cysteine (0.0036-0.3200 μg/L·min) were far more than those of treatments without cysteine (0.0012-0.1614 μg/L·min), and the activation energy (Ea = 43.89 kJ/mol) was far less than that of treatment without cysteine (61.74 kJ/mol). Increasing temperature could obviously improve the degradation efficiency of patulin, regardless of the presence of cysteine. Thus, both cysteine and high temperature decreased the stability of patulin in highly acidic conditions and improved its degradation efficiency, which could be applied to guide the detoxification of patulin by cysteine in the juice processing industry.
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Vallecillo-Rivas M, Toledano-Osorio M, Vallecillo C, Toledano M, Osorio R. The Collagen Origin Influences the Degradation Kinetics of Guided Bone Regeneration Membranes. Polymers (Basel) 2021; 13:polym13173007. [PMID: 34503047 PMCID: PMC8433692 DOI: 10.3390/polym13173007] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Revised: 08/21/2021] [Accepted: 09/03/2021] [Indexed: 01/28/2023] Open
Abstract
Collagen membranes are currently the most widely used membranes for guided bone regeneration; however, their rapid degradation kinetics means that the barrier function may not remain for enough time to permit tissue regeneration to happen. The origin of collagen may have an important effect on the resistance to degradation. The aim of this study was to investigate the biodegradation pattern of five collagen membranes from different origins: Biocollagen, Heart, Evolution X-fine, CopiOs and Parasorb Resodont. Membranes samples were submitted to different degradation tests: (1) hydrolytic degradation in phosphate buffer saline solution, (2) bacterial collagenase from Clostridium histolyticum solution, and (3) enzyme resistance using a 0.25% porcine trypsin solution. Immersion periods from 1 up to 50 days were performed. At each time point, thickness and weight measurements were performed with a digital caliper and an analytic microbalance, respectively. ANOVA and Student–Newman–Keuls tests were used for comparisons (p < 0.05). Differences between time-points within the same membranes and solutions were assessed by pair-wise comparisons (p < 0.001). The Evolution X-fine collagen membrane from porcine pericardium attained the highest resistance to all of the degradation tests. Biocollagen and Parasorb Resodont, both from equine origin, experienced the greatest degradation when immersed in PBS, trypsin and C. histolyticum during challenge tests. The bacterial collagenase solution was shown to be the most aggressive testing method.
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Affiliation(s)
- Marta Vallecillo-Rivas
- Faculty of Dentistry, Colegio Máximo de Cartuja s/n, University of Granada, 18071 Granada, Spain; (M.V.-R.); (C.V.); (M.T.); (R.O.)
- Medicina Clínica y Salud Pública PhD Programme, 18071 Granada, Spain
| | - Manuel Toledano-Osorio
- Faculty of Dentistry, Colegio Máximo de Cartuja s/n, University of Granada, 18071 Granada, Spain; (M.V.-R.); (C.V.); (M.T.); (R.O.)
- Medicina Clínica y Salud Pública PhD Programme, 18071 Granada, Spain
- Correspondence: ; Tel.: +34-958-243-789
| | - Cristina Vallecillo
- Faculty of Dentistry, Colegio Máximo de Cartuja s/n, University of Granada, 18071 Granada, Spain; (M.V.-R.); (C.V.); (M.T.); (R.O.)
- Medicina Clínica y Salud Pública PhD Programme, 18071 Granada, Spain
| | - Manuel Toledano
- Faculty of Dentistry, Colegio Máximo de Cartuja s/n, University of Granada, 18071 Granada, Spain; (M.V.-R.); (C.V.); (M.T.); (R.O.)
| | - Raquel Osorio
- Faculty of Dentistry, Colegio Máximo de Cartuja s/n, University of Granada, 18071 Granada, Spain; (M.V.-R.); (C.V.); (M.T.); (R.O.)
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Shi J, Long T, Zhou Y, Wang L, Jiang C, Pan D, Zhu X. Efficiency and Quantitative Structure-Activity Relationship of Monoaromatics Oxidation by Quinone-Activated Persulfate. Front Chem 2021; 9:580643. [PMID: 34540795 PMCID: PMC8440822 DOI: 10.3389/fchem.2021.580643] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 03/03/2021] [Indexed: 12/04/2022] Open
Abstract
Quinones and quinone-containing organics have potential of activating persulfate to produce sulfate radical. In this work, the optimal condition for quinone activation of persulfate was investigated. It was found representative monoaromatics were degraded fastest in alkaline environment (pH 10.0), but excessive alkalinity restrained the reaction instead. The mechanisms to explain this phenomenon were speculated. The effect of initial quinone concentration on persulfate oxidation was also investigated at pH 10.0. In addition, a quantitative structure-activity relationship model was established with 15 kinds of monoaromatics, which revealed the most negative atomic net charges on carbon atom played an important role on degradation rates. Chemicals with a smallerq C - were easier oxidized in quinone-activate system. This finding helps further exploration of effective activator in alkaline environment.
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Affiliation(s)
- Jiaqi Shi
- State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing, China
| | - Tao Long
- State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing, China
| | - Yuxuan Zhou
- College of Environment, Hohai University, Nanjing, China
| | - Lei Wang
- State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing, China
| | - Cuiping Jiang
- College of Environment, Hohai University, Nanjing, China
| | - Dongguo Pan
- College of Environment, Hohai University, Nanjing, China
| | - Xin Zhu
- State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing, China
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Oancea S. A Review of the Current Knowledge of Thermal Stability of Anthocyanins and Approaches to Their Stabilization to Heat. Antioxidants (Basel) 2021; 10:1337. [PMID: 34572968 PMCID: PMC8468304 DOI: 10.3390/antiox10091337] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 08/19/2021] [Accepted: 08/20/2021] [Indexed: 01/10/2023] Open
Abstract
Anthocyanins are colored valuable biocompounds, of which extraction increases globally, although functional applications are restrained by their limited environmental stability. Temperature is a critical parameter of food industrial processing that impacts on the food matrix, particularly affecting heat-sensitive compounds such as anthocyanins. Due to the notable scientific progress in the field of thermal stability of anthocyanins, an analytical and synthetic integration of published data is required. This review focuses on the molecular mechanisms and the kinetic parameters of anthocyanin degradation during heating, both in extracts and real food matrices. Several kinetic models (Arrhenius, Eyring, Ball) of anthocyanin degradation were studied. Crude extracts deliver more thermally stable anthocyanins than purified ones. A different anthocyanin behavior pattern within real food products subjected to thermal processing has been observed due to interactions with some nutrients (proteins, polysaccharides). The most recent studies on the stabilization of anthocyanins by linkages to other molecules using classical and innovative methods are summarized. Ensuring appropriate thermal conditions for processing anthocyanin-rich food will allow a rational design for the future development of stable functional products, which retain these bioactive molecules and their functionalities to a great extent.
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Affiliation(s)
- Simona Oancea
- Department of Agricultural Sciences and Food Engineering, "Lucian Blaga" University of Sibiu, 7-9 Dr. Ion Ratiu Street, 550024 Sibiu, Romania
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Jouyandeh M, Akbari V, Paran SMR, Livi S, Lins L, Vahabi H, Saeb MR. Epoxy/Ionic Liquid-Modified Mica Nanocomposites: Network Formation-Network Degradation Correlation. Nanomaterials (Basel) 2021; 11:1990. [PMID: 34443821 DOI: 10.3390/nano11081990] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Revised: 07/18/2021] [Accepted: 07/29/2021] [Indexed: 01/21/2023]
Abstract
We synthesized pristine mica (Mica) and N-octadecyl-N’-octadecyl imidazolium iodide (IM) modified mica (Mica-IM), characterized it, and applied it at 0.1–5.0 wt.% loading to prepare epoxy nanocomposites. Dynamic differential scanning calorimetry (DSC) was carried out for the analysis of the cure potential and kinetics of epoxy/Mica and epoxy/Mica-IM curing reaction with amine curing agents at low loading of 0.1 wt.% to avoid particle aggregation. The dimensionless Cure Index (CI) was used for qualitative analysis of epoxy crosslinking in the presence of Mica and Mica-IM, while qualitative cure behavior and kinetics were studied by using isoconversional methods. The results indicated that both Mica and Mica-IM improved the curability of epoxy system from a Poor to Good state when varying the heating rate in the interval of 5–15 °C min−1. The isoconversional methods suggested a lower activation energy for epoxy nanocomposites with respect to the blank epoxy; thus, Mica and Mica-IM improved crosslinking of epoxy. The higher order of autocatalytic reaction for epoxy/Mica-IM was indicative of the role of liquid crystals in the epoxide ring opening. The glass transition temperature for nanocomposites containing Mica and Mica-IM was also lower than the neat epoxy. This means that nanoparticles participated the reaction because of being reactive, which decelerated segmental motion of the epoxy chains. The kinetics of the thermal decomposition were evaluated for the neat and mica incorporated epoxy nanocomposites epoxy with varying Mica and Mica-IM amounts in the system (0.5, 2.0 and 5.0 wt.%) and heating rates. The epoxy/Mica-IM at 2.0 wt.% of nanoparticle showed the highest thermal stability, featured by the maximum value of activation energy devoted to the assigned system. The kinetics of the network formation and network degradation were correlated to demonstrate how molecular-level transformations can be viewed semi-experimentally.
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Mancuso A, Sacco O, Vaiano V, Bonelli B, Esposito S, Freyria FS, Blangetti N, Sannino D. Visible Light-Driven Photocatalytic Activity and Kinetics of Fe-Doped TiO 2 Prepared by a Three-Block Copolymer Templating Approach. Materials (Basel) 2021; 14:3105. [PMID: 34198890 PMCID: PMC8201317 DOI: 10.3390/ma14113105] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Revised: 05/28/2021] [Accepted: 05/31/2021] [Indexed: 11/16/2022]
Abstract
Fe-doped titania photocatalysts (with 1, 2.5, and 3.5 wt. % Fe nominal content), showing photocatalytic activity under visible light, were prepared by a soft-template assisted sol-gel approach in the presence of the triblock copolymer Pluronic P123. An undoped TiO2 photocatalyst was also prepared for comparison. The photocatalysts were characterized by means of X-ray powder Diffraction (XRPD), Quantitative Phase Analysis as obtained by Rietveld refinement, Diffuse Reflectance (DR) UV-Vis spectroscopy, N2 adsorption/desorption at -196 °C, electrophoretic mobility in water (ζ-potential), and X-ray photoelectron spectroscopy (XPS). The physico-chemical characterization showed that all the samples were 100% anatase phase and that iron was present both in the bulk and at the surface of the Fe-doped TiO2. Indeed, the band gap energy (Eg) decreases with the Fe content, with Tauc's plot determined values ranging from 3.35 (undoped TiO2) to 2.70 eV (3.5 wt. % Fe). Notwithstanding the obtained Eg values, the photocatalytic activity results under visible light highlighted that the optimal Fe content was equal to 2.5 wt. % (Tauc's plot determined Eg = 2.74 eV). With the optimized photocatalyst and in selected operating conditions, under visible light it was possible to achieve 90% AO7 discoloration together with a TOC removal of 40% after 180 min. The kinetic behavior of the photocatalyst was also analyzed. Moreover, the tests in the presence of three different scavengers revealed that the main reactive species are (positive) holes and superoxide species. Finally, the optimized photocatalyst was also able to degrade phenol under visible light.
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Affiliation(s)
- Antonietta Mancuso
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, Italy; (A.M.); (V.V.)
| | - Olga Sacco
- Department of Chemistry and Biology “A. Zambelli”, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, Italy
| | - Vincenzo Vaiano
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, Italy; (A.M.); (V.V.)
| | - Barbara Bonelli
- Unit of Torino Politecnico, Department of Applied Science and Technology and INSTM, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy; (B.B.); (S.E.); (F.S.F.); (N.B.)
| | - Serena Esposito
- Unit of Torino Politecnico, Department of Applied Science and Technology and INSTM, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy; (B.B.); (S.E.); (F.S.F.); (N.B.)
| | - Francesca Stefania Freyria
- Unit of Torino Politecnico, Department of Applied Science and Technology and INSTM, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy; (B.B.); (S.E.); (F.S.F.); (N.B.)
| | - Nicola Blangetti
- Unit of Torino Politecnico, Department of Applied Science and Technology and INSTM, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy; (B.B.); (S.E.); (F.S.F.); (N.B.)
| | - Diana Sannino
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, Italy; (A.M.); (V.V.)
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Temova Rakuša Ž, Pišlar M, Kristl A, Roškar R. Comprehensive Stability Study of Vitamin D3 in Aqueous Solutions and Liquid Commercial Products. Pharmaceutics 2021; 13:pharmaceutics13050617. [PMID: 33922975 PMCID: PMC8147103 DOI: 10.3390/pharmaceutics13050617] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 04/20/2021] [Accepted: 04/23/2021] [Indexed: 12/30/2022] Open
Abstract
Vitamin D3 has numerous beneficial effects, such as musculoskeletal, immunomodulatory, and neuroprotective. However, its instability is the main obstacle to formulating quality products. Despite increased attention and growing use, data on vitamin D3 stability is scarce because data from individual studies is inconclusive and mostly qualitative. Therefore, we have systematically investigated the influence of various factors (temperature, light, oxygen, pH, concentration, and metal ions) on its stability in aqueous media using a stability-indicating HPLC-UV method. First-order kinetics fitted its degradation under all tested conditions except light and oxygen. In both cases, the established models in chemical kinetics were inappropriate and upgraded with the Weibull model. Metal ions and acidic conditions had the main destabilizing effect on vitamin D3 in aqueous media, but these solutions were successfully stabilized after the addition of ethylenediaminetetraacetic acid (EDTA), ascorbic acid, and citric acid, individually and in combination. EDTA showed the most significant stabilizing effect. Synergism among antioxidants was not observed. Our findings on vitamin D3 instability in aqueous media also correlated with its instability in commercial products. Vitamin D3 aqueous products require proper stabilization, thereby signifying the importance and contribution of the obtained results to the formulation of stable and quality products.
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Xia X, Zhu F, Li J, Yang H, Wei L, Li Q, Jiang J, Zhang G, Zhao Q. A Review Study on Sulfate-Radical-Based Advanced Oxidation Processes for Domestic/Industrial Wastewater Treatment: Degradation, Efficiency, and Mechanism. Front Chem 2020; 8:592056. [PMID: 33330379 PMCID: PMC7729018 DOI: 10.3389/fchem.2020.592056] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 10/21/2020] [Indexed: 12/31/2022] Open
Abstract
High levels of toxic organic pollutants commonly detected during domestic/industrial wastewater treatment have been attracting research attention globally because they seriously threaten human health. Sulfate-radical-based advanced oxidation processes (SR-AOPs) have been successfully used in wastewater treatment, such as that containing antibiotics, pesticides, and persistent organic pollutants, for refractory contaminant degradation. This review summarizes activation methods, including physical, chemical, and other coupling approaches, for efficient generation of sulfate radicals and evaluates their applications and economic feasibility. The degradation behavior as well as the efficiency of the generated sulfate radicals of typical domestic and industrial wastewater treatment is investigated. The categories and characteristics of the intermediates are also evaluated. The role of sulfate radicals, their kinetic characteristics, and possible mechanisms for organic elimination are assessed. In the last section, current difficulties and future perspectives of SR-AOPs for wastewater treatment are summarized.
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Affiliation(s)
- Xinhui Xia
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, China
| | - Fengyi Zhu
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, China
| | - Jianju Li
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, China
| | - Haizhou Yang
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, China
| | - Liangliang Wei
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, China
| | - Qiaoyang Li
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, China
| | - Junqiu Jiang
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, China
| | - Guangshan Zhang
- College of Resource and Environment, Qingdao Agricultural University, Qingdao, China
| | - Qingliang Zhao
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, China
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Zhu W, Chen X, Yuan L, Wu J, Yao J. Degradation Kinetics and Shelf Life of N-acetylneuraminic Acid at Different pH Values. Molecules 2020; 25:E5141. [PMID: 33167310 DOI: 10.3390/molecules25215141] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 10/30/2020] [Accepted: 11/02/2020] [Indexed: 11/24/2022] Open
Abstract
The objective of this study was to investigate the stability and degradation kinetics of N-acetylneuraminic acid (Neu5Ac). The pH of the solution strongly influenced the stability of Neu5Ac, which was more stable at neutral pH and low temperatures. Here, we provide detailed information on the degradation kinetics of Neu5Ac at different pH values (1.0, 2.0, 11.0 and 12.0) and temperatures (60, 70, 80 and 90 °C). The study of the degradation of Neu5Ac under strongly acidic conditions (pH 1.0–2.0) is highly pertinent for the hydrolysis of polysialic acid. The degradation kinetics of alkaline deacetylation were also studied. Neu5Ac was highly stable at pH 3.0–10.0, even at high temperature, but the addition of H2O2 greatly reduced its stability at pH 5.0, 7.0 and 9.0. Although Neu5Ac has a number of applications in products of everyday life, there are no reports of rigorous shelf-life studies. This research provides kinetic data that can be used to predict product shelf lives at different temperatures and pH values.
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Esmizadeh E, Tzoganakis C, Mekonnen TH. Degradation Behavior of Polypropylene during Reprocessing and Its Biocomposites: Thermal and Oxidative Degradation Kinetics. Polymers (Basel) 2020; 12:polym12081627. [PMID: 32707872 PMCID: PMC7464851 DOI: 10.3390/polym12081627] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/11/2020] [Accepted: 07/17/2020] [Indexed: 11/16/2022] Open
Abstract
Non-isothermal thermogravimetric analysis (TGA) was employed to investigate the degradation of polypropylene (PP) during simulated product manufacturing in a secondary process and wood-plastic composites. Multiple batch mixing cycles were carried out to mimic the actual recycling. Kissinger-Akahira-Sunose (KAS), Ozawa-Flynn-Wall (OFW), Friedman, Kissinger and Augis models were employed to calculate the apparent activation energy (Ea). Experimental investigation using TGA indicated that the thermograms of PP recyclates shifted to lower temperatures, revealing the presence of an accelerated degradation process induced by the formation of radicals during chain scission. Reprocessing for five cycles led to roughly a 35% reduction in ultimate mixing torque, and a more than 400% increase in the melt flow rate of PP. Ea increased with the extent of degradation (α), and the dependency intensified with the reprocessing cycles. In biocomposites, despite the detectable degradation steps of wood and PP in thermal degradation, a partial coincidence of degradation was observed under air. Deconvolution was employed to separate the overlapped cellulose and PP peaks. Under nitrogen, OFW estimations for the deconvoluted PP exposed an upward shift of Ea at the whole range of α due to the high thermal absorbance of the wood chars. Under air, the Ea of deconvoluted PP showed an irregular rise in the initial steps, which could be related to the high volume of evolved volatiles from the wood reducing the oxygen diffusion.
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Kovalcik A, Obruca S, Kalina M, Machovsky M, Enev V, Jakesova M, Sobkova M, Marova I. Enzymatic Hydrolysis of Poly(3-Hydroxybutyrate- co-3-Hydroxyvalerate) Scaffolds. Materials (Basel) 2020; 13:ma13132992. [PMID: 32635613 PMCID: PMC7372466 DOI: 10.3390/ma13132992] [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] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 07/02/2020] [Accepted: 07/03/2020] [Indexed: 11/25/2022]
Abstract
Polyhydroxyalkanoates (PHAs) are hydrolyzable bio-polyesters. The possibility of utilizing lignocellulosic waste by-products and grape pomace as carbon sources for PHA biosynthesis was investigated. PHAs were biosynthesized by employing Cupriavidus necator grown on fructose (PHBV-1) or grape sugar extract (PHBV-2). Fifty grams of lyophilized grape sugar extract contained 19.2 g of glucose, 19.1 g of fructose, 2.7 g of pectin, 0.52 g of polyphenols, 0.51 g of flavonoids and 7.97 g of non-identified rest compounds. The grape sugar extract supported the higher production of biomass and modified the composition of PHBV-2. The biosynthesized PHAs served as matrices for the preparation of the scaffolds. The PHBV-2 scaffolds had about 44.2% lower crystallinity compared to the PHBV-1 scaffolds. The degree of crystallinity markedly influenced the mechanical behavior and enzymatic hydrolysis of the PHA scaffolds in the synthetic gastric juice and phosphate buffer saline solution with the lipase for 81 days. The higher proportion of amorphous moieties in PHBV-2 accelerated enzymatic hydrolysis. After 81-days of lasting enzymatic hydrolysis, the morphological changes of the PHBV-1 scaffolds were negligible compared to the visible destruction of the PHBV-2 scaffolds. These results indicated that the presence of pectin and phenolic moieties in PHBV may markedly change the semi-crystalline character of PHBV, as well as its mechanical properties and the course of abiotic or enzymatic hydrolysis.
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Affiliation(s)
- Adriana Kovalcik
- Department of Food Chemistry and Biotechnology, Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (S.O.); (M.J.); (M.S.); (I.M.)
- Correspondence: ; Tel.: +420-541-149-422
| | - Stanislav Obruca
- Department of Food Chemistry and Biotechnology, Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (S.O.); (M.J.); (M.S.); (I.M.)
| | - Michal Kalina
- Department of Physical and Applied Chemistry, Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (M.K.); (V.E.)
| | - Michal Machovsky
- Centre of Polymer Systems, Tomas Bata University in Zlin, trida Tomase Bati 5678, 760 01 Zlin, Czech Republic;
| | - Vojtech Enev
- Department of Physical and Applied Chemistry, Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (M.K.); (V.E.)
| | - Michaela Jakesova
- Department of Food Chemistry and Biotechnology, Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (S.O.); (M.J.); (M.S.); (I.M.)
| | - Marketa Sobkova
- Department of Food Chemistry and Biotechnology, Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (S.O.); (M.J.); (M.S.); (I.M.)
| | - Ivana Marova
- Department of Food Chemistry and Biotechnology, Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (S.O.); (M.J.); (M.S.); (I.M.)
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Huang Y, Wang H, Huang K, Huang D, Yin S, Guo Q. Degradation kinetics and mechanism of 3-Chlorobenzoic acid in anoxic water environment using graphene/TiO 2 as photocatalyst. Environ Technol 2020; 41:2165-2179. [PMID: 30526405 DOI: 10.1080/09593330.2018.1556741] [Citation(s) in RCA: 1] [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: 05/06/2018] [Accepted: 12/03/2018] [Indexed: 06/09/2023]
Abstract
Degradation kinetics and mechanism of 3-Chlorobenzoic acid (3-CBA) in anoxic water environment using graphene/TiO2 (GR/TiO2) as photocatalyst had been investigated. The effects of various parameters such as catalyst dosage, pH, initial concentration, catalyst reuse and dissolved oxygen (DO) on 3-CBA photocatalytic degradation kinetics were studied. The qualitative and quantitative analysis for degradation intermediate products and parent compound were studied by using HPLC, HPLC/MS/MS and IC technologies. The results show that the residual concentration of 3-CBA has a good linear relationship and its correlation coefficient R 2 are all greater than 0.985 by Langmuir-Hinshelwood (L-H) dynamic model under different photocatalytic degradation conditions. Some oxidative degradation products such as 3-chlorophenol, resorcinol, and hydroxyquinol are generated, and some reductive degradation products such as 3-chlorobenzaldehyde, 3-hydroxybenzaldehyde, 3-hydroxybenzyl alcohol, and cyclohexanediol are produced, and part of 3-CBA are mineralized to generate CO2 when DO is in the range of 0.5-1.0 mg/L; When DO is less than 0.28 mg/L, photocatalytic reduction mainly occurs. The results provide a theoretical basis for photocatalytic in situ remediation of pollutants in anoxic water environment.
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Affiliation(s)
- Yiyang Huang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, People's Republic of China
| | - Hui Wang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, People's Republic of China
| | - Kai Huang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, People's Republic of China
| | - Donggen Huang
- School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang, People's Republic of China
| | - Shuang Yin
- School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang, People's Republic of China
| | - Qin Guo
- School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang, People's Republic of China
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Bockuviene A, Sereikaite J. New β-Carotene-Chitooligosaccharides Complexes for Food Fortification: Stability Study. Foods 2020; 9:E765. [PMID: 32531942 PMCID: PMC7353500 DOI: 10.3390/foods9060765] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 05/30/2020] [Accepted: 06/09/2020] [Indexed: 12/20/2022] Open
Abstract
The application of β-carotene in food industry is limited due to its chemical instability. The drawback may be overcome by designing new delivery systems. The stability of β-carotene complexed with chitooligosaccharides by kneading, freeze-drying and sonication methods was investigated under various conditions. The first-order kinetics parameters of the reaction of β-carotene degradation were calculated. The complexation improved the stability of β-carotene at high temperatures and ensured its long-term stability in the dark at 4 °C and 24 °C, and in the light at 24 °C. In water solutions, the best characteristics were exhibited by the complexes prepared by freeze-drying and sonication methods. In the powder form, the complexes retained their colour for the period of the investigation of four months. The calculated total colour differences of the complexes were qualified as appreciable, detectable by ordinary people, but not large. Therefore, β-carotene-chitooligosaccharides complexes could be used as a new delivery system suitable for food fortification.
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Affiliation(s)
- Alma Bockuviene
- Department of Chemistry and Bioengineering, Vilnius Gediminas Technical University, 10221 Vilnius, Lithuania;
- Department of Polymer Chemistry, Institute of Chemistry, Vilnius University, 01513 Vilnius, Lithuania
| | - Jolanta Sereikaite
- Department of Chemistry and Bioengineering, Vilnius Gediminas Technical University, 10221 Vilnius, Lithuania;
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He Y, Meng M, Yohannes WK, Khan M, Wang M, Abd El-Aty AM, Hacımüftüoğlu F, He Y, Gao L, She Y. Dissipation pattern and residual levels of boscalid in cucumber and soil using liquid chromatography-tandem mass spectrometry. J Environ Sci Health B 2019; 55:388-395. [PMID: 31868560 DOI: 10.1080/03601234.2019.1706374] [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] [Indexed: 06/10/2023]
Abstract
To stipulate the rationale of spraying doses and to determine the safe interval period of boscalid suspension concentrate (SC), the degradation dynamics and residual levels were investigated in cucumber and soil using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Field trials were conducted according to Chinese Guideline on pesticide residue trials. Following application, the degradation kinetics was best ascribed to first-order kinetic models with half-life of 2.67-9.90 d in cucumber. Spraying boscalid SC at 1.5-fold the recommended dosage yield terminal residues, which are clearly lower than the maximum residue limit (MRL) established by China (MRL =5 mg.kg-1) in cucumber. At variance, the dissipation dynamics in soil did not fit to first-order kinetics and the half-life was more than 17 days, the finding which denotes that the degradation behavior of boscalid in soil proceeds slowly. It has therefore been shown that boscalid is safe for use on cucumbers under the recommended dosage.
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Affiliation(s)
- Yahui He
- China-Canada Joint Lab of Food Nutrition and Health (Beijing), Beijing Technology & Business University, Beijing, P.R. China
| | - Man Meng
- Institute of Quality Standards & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, P.R. China
| | | | - Majid Khan
- China-Canada Joint Lab of Food Nutrition and Health (Beijing), Beijing Technology & Business University, Beijing, P.R. China
| | - Mengqiang Wang
- Institute of Quality Standards & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, P.R. China
| | - A M Abd El-Aty
- State Key Laboratory of Biobased Material and Green Papermaking, College of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Science, Jinan, China
- Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
| | - Fazil Hacımüftüoğlu
- Department of Soil Sciences and Plant Nutrition, Faculty of Agriculture, Atatürk University, Erzurum, Turkey
| | - Yongjuan He
- College of Health and Environment, Beijing Union University, Beijing, P.R. China
| | - Liping Gao
- College of Health and Environment, Beijing Union University, Beijing, P.R. China
| | - Yongxin She
- Institute of Quality Standards & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, P.R. China
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Lian T, Huang C, Liang F, Li X, Xi J. Simultaneously Providing Iron Source toward Electro-Fenton Process and Enhancing Hydrogen Peroxide Production via a Fe 3O 4 Nanoparticles Embedded Graphite Felt Electrode. ACS Appl Mater Interfaces 2019; 11:45692-45701. [PMID: 31742993 DOI: 10.1021/acsami.9b16236] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Electro-reduction of O2 to generate H2O2 is an attractive alternative to the current anthraquinone process and quite necessary for chemical industries and environmental remediation. In general, sufficient porous structure contributes to expose more catalytic active sites and shorten diffusion paths for the heterogeneous catalysis of O2. In this work, initially the Fe3O4 nanoparticles embedded graphite felt (Fe3O4@GF) is prepared through a mild hydrothermal following with thermal reduction method. This special combination not only provides iron source for the electro-Fenton reaction but also supplies rich active sites from the Fe3O4 embedded structure with abundant cracks, which are beneficial to increase the reaction rate. Compared with raw graphite felt (RGF), fresh Fe3O4@GF exhibits superior pollutant degradation kinetics with more than 400% increase and approximately 37.8% improvement to the removal of total organic carbon. A 98% decolorization of rhodamine B (RhB) can be achieved in just 5 min and quickly completes 100% removal of RhB in the next few seconds. As the electro-Fenton reaction progresses, Fe3O4 dissolves in the electrolyte, leaving a porous structure on the surface of the GF to form a porous GF (PGF), and the rapid radical reaction activates the GF surface. Both the chemical etching of Fe3O4 and the electro-Fenton process can further increase the specific surface area, defects, and actives sites of the electrode. As expected, the active PGF exhibits favorable performance of H2O2 production in electrolytes of different pHs: 1 (320.0 ± 36.5 mg L-1), 3 (301.9 ± 13.2 mg L-1), and 7 (320.4 ± 21.2 mg L-1). The degradation performance of PGF does not significantly decay even after 20 cycles of repeated use, indicating the good structural stability and long-term durability. The superiority of the in situ Fe source and fast reaction kinetics for electro-Fenton of Fe3O4@GF is confirmed, and this holey engineered strategy also provides the possibility to achieve swift water purification and open up a new way for developing efficient carbon-based electrodes.
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Affiliation(s)
- Tingting Lian
- State Key Laboratory of Fine Chemicals, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology , Dalian University of Technology , Dalian 116024 , China
- Tsinghua Shenzhen International Graduate School , Tsinghua University , Shenzhen 518055 , China
| | - Chao Huang
- Tsinghua Shenzhen International Graduate School , Tsinghua University , Shenzhen 518055 , China
- School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| | - Feng Liang
- The State Key Laboratory of Refractories and Metallurgy, School of Chemistry and Chemical Engineering , Wuhan University of Science and Technology , Wuhan 430081 , China
| | - Xinyong Li
- State Key Laboratory of Fine Chemicals, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology , Dalian University of Technology , Dalian 116024 , China
| | - Jingyu Xi
- Tsinghua Shenzhen International Graduate School , Tsinghua University , Shenzhen 518055 , China
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Campbell MTD, Jones DS, Andrews GP, Li S. Understanding the physicochemical properties and degradation kinetics of nicotinamide riboside, a promising vitamin B 3nutritional supplement. Food Nutr Res 2019; 63:3419. [PMID: 31807125 PMCID: PMC6878970 DOI: 10.29219/fnr.v63.3419] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 09/11/2019] [Accepted: 10/16/2019] [Indexed: 11/20/2022] Open
Abstract
Nicotinamide riboside (NR), a newly recognised form of vitamin B3 and a precursor to nicotinamide adenine dinucleotide (NAD+), has been demonstrated to show therapeutic potential and the possibility of becoming a drug compound in addition to its proven role in rejuvenating ageing cells in mice. However, current literature is devoid of information relating to the physicochemical characterisation of NR and its respective impact upon formulation and final product processing. Here we report physicochemical properties of NR including pKa, log P, solubility, melting point, degradation mechanics, and kinetics, with a special focus on its stability under thermal and physiologically relevant conditions. A simple and rapid HPLC method confirms a base-catalysed hydrolysis degradation of NRCl to nicotinamide and sugar in simulated gastrointestinal (GI) fluids. Given the antagonising effect of nicotinamide against NR, the presented data have a profound impact on how NRCl should be handled both during formulation and storage to prevent formation and to limit accumulation of nicotinamide. The innovative combinatorial use of 1H NMR and Differential Scanning Calorimetry (DSC) was employed to investigate thermal events during NR melting. NRCl degrades upon melting and in solution undergoes hydrolysis in a buffer and in simulated intestinal environments. The results suggest that a proper and evidence-based formulation of NRCl is vital to enable further investigation and clinical analysis of this promising and novel nutrient. Any formulation would need to promote the stability of NRCl and protect it from hostile environments to prevent the accumulation of a potentially antagonistic degradation product. With the current work, we have filled a niche but vital gap in NR literature and the data presented may prove useful in furthering the understanding, specifically the formulation and processing of NRCl.
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Affiliation(s)
| | - David S Jones
- School of Pharmacy, Queens University Belfast, Belfast, Norther Ireland, UK
| | - Gavin P Andrews
- School of Pharmacy, Queens University Belfast, Belfast, Norther Ireland, UK
| | - Shu Li
- School of Pharmacy, Queens University Belfast, Belfast, Norther Ireland, UK
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He X, Huang H, Tang Y, Guo L. Kinetics and mechanistic study on degradation of prednisone acetate by ozone. J Environ Sci Health A Tox Hazard Subst Environ Eng 2019; 55:292-304. [PMID: 31769340 DOI: 10.1080/10934529.2019.1688020] [Citation(s) in RCA: 3] [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: 08/25/2019] [Revised: 10/22/2019] [Accepted: 10/25/2019] [Indexed: 06/10/2023]
Abstract
Prednisone acetate (PNSA) is one of the regular glucocorticoid medicines that have been detected in surface water. In this work, the removal of PNSA by ozone was systematically studied under various conditions, and degradation intermediates and reaction pathways were proposed. The results showed that aqueous ozonation was able to remove PNSA effectively, and low pH favored this reaction. The addition of tertiary butanol did not inhibit the oxidation of PNSA by ozone, suggesting that the degradation was caused mainly by the direct oxidation effect of ozone molecules. Moreover, the presence of carboxylated or hydroxylated multiwalled carbon nanotubes can enhance the removal efficiency of PNSA by ozone. Under neutral and acidic conditions, the degradation of PNSA followed pseudo-first-order reaction. Seven intermediates were detected via liquid chromatography-mass spectrometry, and the degradation pathways were then proposed by considering the relative charge density of the frontier orbitals calculated with the Gaussian program. The electrophilic reaction and the Criegee mechanism were the primary reaction mechanisms in the degradation of PNSA by ozone. Formic acid, acetic acid, and oxalic acid were detected as the final reaction products via ion chromatography. Additionally, the aquatic toxicity of the ozonation products was predicted using ECOSAR method. The biodegradation potentials of the pollutant and the ozonation products were estimated using BIOWINTM, suggesting that O3 treatment could significantly enhance the biodegradable potentials of PNSA and its transformation intermediates in the biological post-treatment process. This work can provide useful information for the treatment of PNSA-containing wastewaters.
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Affiliation(s)
- Xiuling He
- Department of Environmental Science, Guangdong Polytechnic of Environmental Protection Engineering, Guangdong Foshan, P.R. China
| | - Hua Huang
- Department of Environmental Science, Guangdong Polytechnic of Environmental Protection Engineering, Guangdong Foshan, P.R. China
| | - Ying Tang
- Department of Environmental Science, Guangdong Polytechnic of Environmental Protection Engineering, Guangdong Foshan, P.R. China
| | - Lulu Guo
- Department of Environmental Science, Guangdong Polytechnic of Environmental Protection Engineering, Guangdong Foshan, P.R. China
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42
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Kamel HE, Al-Dobaib SN, Salem AZ. Dietary supplementation of sunflower oil and quebracho tannins in sheep feeding: in vivo nutrient digestibility, nitrogen utilization and in vitro ruminal degradation kinetics. J Sci Food Agric 2019; 99:4211-4217. [PMID: 30790286 DOI: 10.1002/jsfa.9651] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Revised: 02/13/2019] [Accepted: 02/18/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND The effect of the inclusion of sunflower oil (SF) and quebracho tannin (QT) in a sheep diet was evaluated. Nutrient digestibility and nitrogen (N) utilization, as well as in vitro ruminal degradation kinetics, were evaluated at three levels [0, 20 and 40 g kg-1 of diet dry matter] of SF and QT in a 32 arrangement. The treatments were 0 (control); 20 and 40 g of QT and/or SF kg-1 of the diet. Four intact male sheep (45 ± 1.3 kg) for each treatment were used in the digestibility trial and kept individually in metabolic cages. RESULTS Nutrient digestibility and N balance were not affected by SF. However, QT at 40 g kg-1 of dry matter decreased (P < 0.05) nutrient digestibility and also increased the proportion of absorbed N. Both SF and QT reduced (P < 0.05) the slowly degraded fraction and rate for organic matter and N. Even though the QT had a negative (P < 0.05) effect on nutrient digestibility, this effect was mild (P > 0.05) when SF was included in the QT-added diets. Moreover, an interaction (P < 0.05) of SF × QT was observed on the synchronization index as an indicator of the efficiency of rumen microbial protein synthesis. CONCLUSION Supplementation of either SF or QT to sheep diets reduced ruminal organic matter and N degradability, reflecting the compensatory digestion in the post-ruminal track for organic matter feed utilization. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Hosam Em Kamel
- Faculty of Agriculture, Department of Animal and Fish Production, University of Alexandria (El-Shatby), Alexandria, Egypt
| | - Soliman N Al-Dobaib
- Faculty of Agriculture and Veterinary Medicine, Department of Animal Production and Breeding, Qassim University, Buriedah, Saudi Arabia
| | - Abdelfattah Zm Salem
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma del Estado de México, Toluca, Mexico
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Xie J, Xu Y, Shishir MR, Zheng X, Chen W. Green extraction of mulberry anthocyanin with improved stability using β-cyclodextrin. J Sci Food Agric 2019; 99:2494-2503. [PMID: 30379343 DOI: 10.1002/jsfa.9459] [Citation(s) in RCA: 4] [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: 07/31/2018] [Revised: 10/26/2018] [Accepted: 10/27/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND Mulberry anthocyanin is reported to possess various biological activities and it is unstable during extraction or food production. The use of organic solvents for extraction of mulberry anthocyanins may cause environmental pollution and safety concerns. Therefore, the aim of this study was to investigate the effect of a green extraction solvent (cyclodextrin) on the recovery of anthocyanin from mulberry fruits, as well as the thermal stability of anthocyanin. RESULTS β-Cyclodextrin (β-CD) or hydroxypropyl-β-cyclodextrin showed better anthocyanin extraction efficiency than water and ethanol aqueous solution for all tested mulberry cultivars. A molecular docking study indicated that anthocyanin (cyanidin-3-O-glucoside) was encapsulated in the cavity of β-CD, thus enhancing the solubility of anthocyanin. The extraction process was subsequently optimized using a Box-Behnken design. The optimal extraction conditions for anthocyanin and antioxidant activity were found at extraction temperature of 20 °C, extraction time of 44.95 min and β-CD concentration of 45 g L-1 . Furthermore, a degradation kinetic study demonstrated that addition of β-CD could significantly improve the thermal stability of anthocyanin during extraction, with the activation energy of anthocyanin degradation increasing from 63.06 to 76.77 kJ mol-1 . CONCLUSIONS Overall, our study suggests that β-CD is an alternative green extraction solvent for the recovery of anthocyanins, and addition of β-CD may potentially increase the thermal stability of anthocyanin during the extraction, which may give guidance for functional beverage production. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Jiahong Xie
- Department of Food Science and Nutrition, National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Fuli Institute of Food Science, Zhejiang University, Hangzhou, China
| | - Yang Xu
- Department of Food Science and Nutrition, National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Fuli Institute of Food Science, Zhejiang University, Hangzhou, China
| | - Mohammad Ri Shishir
- Department of Food Science and Nutrition, National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Fuli Institute of Food Science, Zhejiang University, Hangzhou, China
| | - Xiaodong Zheng
- Department of Food Science and Nutrition, National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Fuli Institute of Food Science, Zhejiang University, Hangzhou, China
| | - Wei Chen
- Department of Food Science and Nutrition, National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Fuli Institute of Food Science, Zhejiang University, Hangzhou, China
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Liu S, Zhang Y, Zeng P, Wang H, Song Y, Li J. Isolation and Characterization of a Bacterial Strain Capable of Efficient Berberine Degradation. Int J Environ Res Public Health 2019; 16:E646. [PMID: 30795638 DOI: 10.3390/ijerph16040646] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Revised: 02/17/2019] [Accepted: 02/19/2019] [Indexed: 11/17/2022]
Abstract
Background: Berberine (BBR) is a pharmaceutical chemical with a broad antibacterial spectrum, and its biological treatment has been of research and practical interest. In this study, a pure bacterial strain B16 was isolated from the activated sludge in a pharmaceutical wastewater treatment plant. The aim of the study is to characterize the properties of the strain B16, especially its BBR degradation capability. Methods: The identification of strain B16 was conducted by visual observation, as well as biochemical and phylogenetic analysis. The degradation kinetics of strain B16 was tentatively described by Haldane model. Results: The strain B16 was 100% determined as a Sphingopyxis sp. The kinetic parameters of BBR degradation by strain B16 were as follows: Vmax 54.73 ± 5.54 mg (g MLSS · h)−1, Km 66.68 ± 8.95 mg L−1, and Ki 43.16 ± 5.92 mg L−1, with an R2 of 0.996. Stain B16 exhibited considerable capability of BBR degradation. BBR of initial concentration 40 mg L−1 could be completely degraded in 48 h under optimal conditions. Conclusions: strain B16 was the first pure culture found with the ability to totally mineralize BBR, indicating the potential of B16 application in real industrial processes.
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Wingert NR, Arbo MD, Göethel G, da Costa B, Altknecht LF, Garcia SC, Steppe M. In vitro toxicity assessment of rivaroxaban degradation products and kinetic evaluation to decay process. Drug Chem Toxicol 2018; 42:509-518. [PMID: 29644883 DOI: 10.1080/01480545.2018.1452931] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Degradation kinetics of oral anticoagulant rivaroxaban (RIV) was assessed in acid and alkaline media and while exposed to UVC radiation. Among all stress conditions tested, kinetic degradation process was better described by a zero-order model. A stability indicating method was validated for the analysis of the anticoagulant RIV in tablets by high-performance liquid chromatography. Robustness was evaluated with a two-level Plackett-Burman experimental design. The effect of acute exposition of the human hepatoblastoma HepG2 cell line to RIV stressed samples (100 and 500 µM) was assessed through in vitro toxicity tests. MTT reduction, neutral red uptake, mitochondrial membrane potential, and low molecular weight DNA diffusion assays were employed for cytotoxicity evaluation (5×104 cells/well). The genotoxic potential was assessed by comet assay (2×104 cells/well). Acute toxicity to HepG2 cells was assessed after 24 h incubation with sample solutions, for each test. A direct relationship between the increased amount of alkaline degradation products and higher cytotoxic potential was found. Results obtained by viability assay investigations support the concerns on risks associated with acute toxicity and genotoxicity of pharmaceutical samples containing degradation products as impurities.
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Affiliation(s)
- Nathalie R Wingert
- a Laboratory of Pharmaceutical Quality Control (LCQFar) , Federal University of Rio Grande do Sul , Porto Alegre , Brazil
| | - Marcelo D Arbo
- b Laboratory of Toxicology (LATOX) , Federal University of Rio Grande do Sul , Porto Alegre , Brazil
| | - Gabriela Göethel
- b Laboratory of Toxicology (LATOX) , Federal University of Rio Grande do Sul , Porto Alegre , Brazil
| | - Bárbara da Costa
- b Laboratory of Toxicology (LATOX) , Federal University of Rio Grande do Sul , Porto Alegre , Brazil
| | - Louise F Altknecht
- b Laboratory of Toxicology (LATOX) , Federal University of Rio Grande do Sul , Porto Alegre , Brazil
| | - Solange C Garcia
- b Laboratory of Toxicology (LATOX) , Federal University of Rio Grande do Sul , Porto Alegre , Brazil
| | - Martin Steppe
- a Laboratory of Pharmaceutical Quality Control (LCQFar) , Federal University of Rio Grande do Sul , Porto Alegre , Brazil
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Al-Nimry SS, Alkhamis KA. Effect of Moisture Content of Chitin-Calcium Silicate on Rate of Degradation of Cefotaxime Sodium. AAPS PharmSciTech 2018; 19:1337-1343. [PMID: 29340979 DOI: 10.1208/s12249-017-0948-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 12/28/2017] [Indexed: 11/30/2022] Open
Abstract
Assessment of incompatibilities between active pharmaceutical ingredient and pharmaceutical excipients is an important part of preformulation studies. The objective of the work was to assess the effect of moisture content of chitin calcium silicate of two size ranges (two specific surface areas) on the rate of degradation of cefotaxime sodium. The surface area of the excipient was determined using adsorption method. The effect of moisture content of a given size range on the stability of the drug was determined at 40°C in the solid state. The moisture content was determined at the beginning and the end of the kinetic study using TGA. The degradation in solution was studied for comparison. Increasing the moisture content of the excipient of size range 63-180 μm (surface area 7.2 m2/g) from 3.88 to 8.06% increased the rate of degradation of the drug more than two times (from 0.0317 to 0.0718 h-1). While an opposite trend was observed for the excipient of size range < 63 μm (surface area 55.4 m2/g). The rate of degradation at moisture content < 3% was 0.4547 h-1, almost two times higher than that (0.2594 h-1) at moisture content of 8.54%, and the degradation in solid state at both moisture contents was higher than that in solution (0.0871 h-1). In conclusion, the rate of degradation in solid should be studied taking into consideration the specific surface area and moisture content of the excipient at the storage condition and it may be higher than that in solution.
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Al-Hawash AB, Zhang X, Ma F. Removal and biodegradation of different petroleum hydrocarbons using the filamentous fungus Aspergillus sp. RFC-1. Microbiologyopen 2018; 8:e00619. [PMID: 29577679 PMCID: PMC6341139 DOI: 10.1002/mbo3.619] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 02/15/2018] [Accepted: 02/16/2018] [Indexed: 11/22/2022] Open
Abstract
Petroleum pollution inevitably occurs at any stage of oil production and exerts a negative impact on the environment. Some microorganisms can degrade petroleum hydrocarbons (PHs). Polluted sludge of Rumaila oil field was use to isolate the highly efficient hydrocarbon‐degrading fungal strain. Aspergillus sp. RFC‐1 was obtained and its degradation ability for petroleum hydrocarbons was evaluated through surface adsorption, cell uptake, hydrophobicity, surface tension, biosurfactant production, and emulsification activity. In addition, the degradation mechanism was investigated. The results indicated the strain RFC‐1 showed high removal activity for PHs, including biodegradation, adsorption, and emulsifiability. On the day 7 of incubation, the removal efficiencies of crude oil, naphthalene (NAP), phenanthrene (PHE), and pyrene (PYR) reached 60.3%, 97.4%, 84.9%, and 90.7%, respectively. Biodegradation efficiencies of crude oil, NAP, PHE, and PYR were 51.8%, 84.6%, 50.3%, and 55.1%, respectively. Surface adsorption and cell absorption by live mycelial pellets followed a decreasing order: PYR ≥ PHE > NAP > crude oil. Adsorption by heat‐killed mycelial pellets increased within 40 and 10 min for crude oil and PAHs, respectively, and remained constant thereafter. Effects of cell surface hydrophobicity, surface tension, and emulsification index were discussed. Intra‐ and extracellular enzymes of strain RFC‐1 played important roles in PHs degradation. The strain RFC‐1 is a prospective strain for removing PHs from aqueous environments.
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Affiliation(s)
- Adnan B Al-Hawash
- Key Laboratory of Molecular Biophysics of MOE, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China.,Ministry of Education, Directorate of Education, Basra, Iraq
| | - Xiaoyu Zhang
- Key Laboratory of Molecular Biophysics of MOE, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China
| | - Fuying Ma
- Key Laboratory of Molecular Biophysics of MOE, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China
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Oancea AM, Onofrei C, Turturică M, Bahrim G, Râpeanu G, Stănciuc N. The kinetics of thermal degradation of polyphenolic compounds from elderberry ( Sambucus nigra L.) extract. FOOD SCI TECHNOL INT 2018; 24:361-369. [PMID: 29409346 DOI: 10.1177/1082013218756139] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [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] [Indexed: 01/12/2023]
Abstract
This main focus of this study was to evaluate the thermal degradation kinetics and the phytochemical characterization of the elderberries extract. Pelargonidin-3-sophoroside and delphinidin-3-glucoside were identified as the major anthocyanin compounds and catechin hydrate as the major flavonoid compound. In order to further understand the action of the heat treatment on the bioactive compounds from elderberry extract, fluorescence studies were also carried out. In general, heating at temperatures ranging from 100 to 150 ℃ for up to 90 min caused a decrease in fluorescence intensity, simultaneously with significant redshifts in λmax suggesting important molecular changes inside the anthocyanins structure, affecting the antioxidant activity. Increasing the heating time up to 120 min, the elderberry extract peaked at about 88 nm shifted toward higher wavelengths with respect to that of untreated solutions (peak at 442 nm). The kinetics studies of anthocyanins, fluorescence intensity, and antioxidant activity evidenced a decrease of the degradation rate constants with increased temperature while the activation energies for heat-induced fluorescence intensity, monomeric anthocyanins, and antioxidant activity were 39.62 ± 9.60, 49.97 ± 5.61, and 31.04 ± 19.92 kJ/mol, respectively. Our results can be valuable in terms of establishing the appropriate processing and formulation protocols that could lead to a more efficient utilization of these pigments in actual food products and/or nutraceuticals.
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Affiliation(s)
- Ana-Maria Oancea
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, Galati, Romania
| | - Cristina Onofrei
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, Galati, Romania
| | - Mihaela Turturică
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, Galati, Romania
| | - Gabriela Bahrim
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, Galati, Romania
| | - Gabriela Râpeanu
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, Galati, Romania
| | - Nicoleta Stănciuc
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, Galati, Romania
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Pu W, Zhang H, Wang M, Liu Y, Sun L, Ren X. Superior Stability of Hydroxysafflor Yellow A in Xuebijing Injection and the Associated Mechanism. Molecules 2017; 22:E2129. [PMID: 29207486 PMCID: PMC6149961 DOI: 10.3390/molecules22122129] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 11/26/2017] [Accepted: 11/30/2017] [Indexed: 11/21/2022] Open
Abstract
Hydroxysafflor yellow A (HSYA) is the main bioactive ingredient of XBJ injection. At first, the stability of HSYA in solution and in a Xuebijing injection was investigated, then the mechanisms of the increased stability of HSYA in the XBJ injection were investigated to provide useful information on clinical safety. HSYA stability was investigated as a function of pH and temperature in aqueous solution and an XBJ injection, following the guidelines from the International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use. Products were identified by UPLC-MS/MS. HSYA reaction followed first-order kinetics under all conditions. The half-life of HSYA in XBJ was almost 40 times longer than in aqueous solution. The activation energies of HSYA reaction in aqueous solution and XBJ were calculated to be 78.53 and 92.90 kJ∙mol-1 by using Arrhenius equation. The results indicated that HSYA was more stable in XBJ than in aqueous solution. Two products were identified and the mechanism was intra-molecular nucleophilic substitution. The excellent stability of HSYA in XBJ injection partly due to the micelles formed in the injection. The study may provide clues for compatibility in TCM prescription and also provide useful information for further preparation technology research of HSYA and assessment of clinical safety of XBJ.
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Affiliation(s)
- Weiling Pu
- Key Laboratory of Pharmacology of Traditional Chinese Medicine Formulae, Ministry of Education, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China.
| | - Huijie Zhang
- College of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China.
| | - Meng Wang
- Key Laboratory of Pharmacology of Traditional Chinese Medicine Formulae, Ministry of Education, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China.
| | - Yanan Liu
- College of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China.
| | - Lili Sun
- College of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China.
| | - Xiaoliang Ren
- College of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China.
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Quyet PV, Tan BMJ, Liew CV, Chan LW, Ng QS, Wan Sia Heng P. Equilibria, kinetics and mechanism for the degradation of the cytotoxic compound L-N G-nitroarginine. Drug Dev Ind Pharm 2017; 44:624-631. [PMID: 29139306 DOI: 10.1080/03639045.2017.1405974] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
L-NG-nitroarginine (LNNA), an analog of L-arginine, is a competitive inhibitor of nitric oxide synthase which causes the selective reduction of blood flow to tumor cells. Despite the potential of LNNA to function as an adjuvant in cancer therapies, its poor solubility and stability have hindered the development of an injectable formulation of LNNA that is suitable for human administration. This work, for the first time, details a systematic study on the determination of equilibrium Ka constants and the rate law of LNNA degradation. The four Ka values of LNNA were determined to be 1.03, 1.10 × 10-2, 2.51 × 10-10, and 1.33 × 10-13 M. From the kinetic and equilibrium studies, we have shown that the deprotonated form of LNNA is the main form of LNNA that undergoes degradation in aqueous media at room temperature. The rate law of LNNA degradation was found to be first order with respect to OH- concentration and first order with respect to LNNA- concentration. The rate constant at 25 °C and 1 atm was determined to be 0.04453 M-1min-1. A base catalyzed mechanism of LNNA degradation was proposed based on the kinetic study. The mechanism was found to be very useful in explaining the discrepancies and changes of the rate law at different pH values. It is thus recommended that LNNA should be formulated as a concentrated solution in acidic conditions for maximum chemical stability during storage and be diluted with a basic solution to near physiological pH just before administration.
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Affiliation(s)
- Pham Van Quyet
- a GEA-NUS Pharmaceutical Processing Research Laboratory, Department of Pharmacy , National University of Singapore , Singapore , Singapore
| | - Bernice Mei Jin Tan
- a GEA-NUS Pharmaceutical Processing Research Laboratory, Department of Pharmacy , National University of Singapore , Singapore , Singapore
| | - Celine Valeria Liew
- a GEA-NUS Pharmaceutical Processing Research Laboratory, Department of Pharmacy , National University of Singapore , Singapore , Singapore
| | - Lai Wah Chan
- a GEA-NUS Pharmaceutical Processing Research Laboratory, Department of Pharmacy , National University of Singapore , Singapore , Singapore
| | - Quan Sing Ng
- b Division of Medical Oncology , National Cancer Centre Singapore , Singapore , Singapore
| | - Paul Wan Sia Heng
- a GEA-NUS Pharmaceutical Processing Research Laboratory, Department of Pharmacy , National University of Singapore , Singapore , Singapore
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