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Xu X, Wu A, Guo L, Kuang H, Xu L, Xu C, Liu L. Gold nanoparticle-based immunochromatographic assay for rapid detection of imazalil. NANOSCALE HORIZONS 2023; 9:123-131. [PMID: 37823288 DOI: 10.1039/d3nh00371j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
Imazalil (IMZ) is a commonly used fungicide for controlling fungus in agriculture, leaving residual IMZ in crops that could be hazardous to human health. In this work, we designed IMZ haptens for mice immunization and prepared sensitive monoclonal antibody (mAb) against IMZ. The subtype of anti-IMZ mAb is IgG2a. It possessed a half inhibition concentration (IC50) of 0.95 ng mL-1 and showed no cross-reactivity against other chemicals in ic-ELISA. Taking advantage of the mAb, we developed a gold nanoparticle-based immunochromatographic assay (GICA) for the rapid detection of IMZ in grapes and tomatoes. The assay gave a visual limit of detection (vLOD) of 25 ng g-1 and cut-off value of 500 ng g-1 in both samples. According to the calibration curves, the calculated LOD were 4.12 ng g-1 and 4.70 ng g-1 in grapes and tomatoes, respectively. The recovery rates of IMZ ranged from 84.7% to 104.4% with variation coefficients (CVs) of 5.7-11.8% in spiked samples, indicating a potent practicability of the GICA. The whole GICA process took 30 min. Therefore, the developed assay can be used for on-site detection and quantitation of IMZ in grape and tomato samples.
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Affiliation(s)
- Xinxin Xu
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China.
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China
| | - Aihong Wu
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China.
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China
| | - Lingling Guo
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China.
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China
| | - Hua Kuang
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China.
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China
| | - Liguang Xu
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China.
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China
| | - Chuanlai Xu
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China.
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China
| | - Liqiang Liu
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China.
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China
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2
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Groß J, Kühlborn J, Pusch S, Weber C, Andernach L, Renzer G, Eckhardt P, Brauer J, Opatz T. Comparison of different density functional theory methods for the calculation of vibrational circular dichroism spectra. Chirality 2023; 35:753-765. [PMID: 37227055 DOI: 10.1002/chir.23580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 05/02/2023] [Accepted: 05/03/2023] [Indexed: 05/26/2023]
Abstract
The determination of the absolute configuration (AC) of an organic molecule is still a challenging task for which the combination of spectroscopic with quantum-mechanical methods has become a promising approach. In this study, we investigated the accuracy of DFT methods (480 overall combinations of 15 functionals, 16 basis sets, and 2 solvation models) to calculate the VCD spectra of six chiral organic molecules in order to benchmark their capability to facilitate the determination of the AC.
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Affiliation(s)
- Jonathan Groß
- Department of Chemistry, Johannes Gutenberg University, Mainz, Germany
| | - Jonas Kühlborn
- Department of Chemistry, Johannes Gutenberg University, Mainz, Germany
| | - Stefan Pusch
- Department of Chemistry, Johannes Gutenberg University, Mainz, Germany
| | - Carina Weber
- Department of Chemistry, Johannes Gutenberg University, Mainz, Germany
| | - Lars Andernach
- Department of Chemistry, Johannes Gutenberg University, Mainz, Germany
| | - Galit Renzer
- Department of Chemistry, Johannes Gutenberg University, Mainz, Germany
| | - Paul Eckhardt
- Department of Chemistry, Johannes Gutenberg University, Mainz, Germany
| | - Jan Brauer
- Department of Chemistry, Johannes Gutenberg University, Mainz, Germany
| | - Till Opatz
- Department of Chemistry, Johannes Gutenberg University, Mainz, Germany
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3
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Wu C, Ma B, Chen GQ, Zhang X. Highly efficient and enantioselective synthesis of β-heteroaryl amino alcohols via Ru-catalyzed asymmetric hydrogenation. Chem Commun (Camb) 2022; 58:12696-12699. [DOI: 10.1039/d2cc03701g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We herein report a highly enantioselective hydrogenation of α-N-heteroaryl ketones catalyzed by chiral ruthenium catalysts, furnishing β-heteroaryl amino alcohols in superb yields and enantioselectivities (up to 99% yield and up to 99% ee).
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Affiliation(s)
- Chao Wu
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, People's Republic of China
- Shenzhen Grubbs Institute, Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Baode Ma
- Shenzhen Grubbs Institute, Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Gen-Qiang Chen
- Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen, 518000, People's Republic of China
| | - Xumu Zhang
- Shenzhen Grubbs Institute, Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
- Shenzhen Bay Laboratory, Shenzhen, 518132, China
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4
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del Río RE, Joseph-Nathan P. Vibrational Circular Dichroism Absolute Configuration of Natural Products From 2015 to 2019. Nat Prod Commun 2021. [DOI: 10.1177/1934578x21996166] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Although demonstrated in 1975, vibrational circular dichroism (VCD) finally started to popularize during this century as a reliable tool to determine the absolute configuration (AC) of organic molecules. This research field continues to be a very dynamic one, in particular for the study of natural products which are a unlimited source of chiral molecules. It therefore turns of interest to summarize the accomplishments published in recent years and to comment on some eventual difficulties that emerged in rare cases to complete the AC determination task. Therefore the aim of this review is to update VCD results for the AC assignment of natural products published from 2015 to 2019, a period in which VCD was reported in some 126 publications involving almost 300 molecules. They are organized according the type of studied metabolite allowing an easily search. The molecules correspond to 28 monoterpenes concerning 17 papers, to 42 sesquiterpenes in 14 papers, to 51 diterpenes in 19 publications, to 5 other terpenoids in three papers, to 48 aromatic molecules in 15 reports, to 20 polyketides in 10 publications, to 27 miscellaneous formulas also in 10 papers, and to 76 nitrogen containing compounds, which include alkaloids and their synthetic analogs, in 38 articles. The landscape of reviewed molecules is quite wide as it goes from simple monoterpenes, like borneol or camphor, to very relevant biological molecules like the alkaloid cocaine or tadalafil samples to distinguish genuine and counterfeit Cialis®. In addition, 5 natural products and a simple derivative published outside the reviewed period, were used to illustrate some aspects of density functional theory calculations.
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Affiliation(s)
- Rosa E. del Río
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, Morelia, Mexico
| | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mexico City, Mexico
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Kuhlmann J, Kretschmann AC, Bester K, Bollmann UE, Dalhoff K, Cedergreen N. Enantioselective mixture toxicity of the azole fungicide imazalil with the insecticide α-cypermethrin in Chironomus riparius: Investigating the importance of toxicokinetics and enzyme interactions. CHEMOSPHERE 2019; 225:166-173. [PMID: 30875499 DOI: 10.1016/j.chemosphere.2019.03.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 02/15/2019] [Accepted: 03/04/2019] [Indexed: 06/09/2023]
Abstract
The fungicide imazalil is a chiral compound with one R- and one S-enantiomer. Enantiomers, while having the same chemical properties, can differ in their biological activity expressed as efficacy/toxicity as well as in their degradation kinetics and pathways. Azoles such as imazalil have been shown to synergize the effect of pyrethroid insecticides like α-cypermethrin through inhibition of cytochrome P450 monooxygenase responsible for pyrethroid detoxification. The aim of this study was to investigate, if the enantiomers of imazalil are selective in their synergistic potential in a mixture with a pyrethroid insecticide tested in Chironomus riparius. Potential enantioselectivity was studied on the level of uptake and elimination, inhibition of cytochrome P450 activity measured in vitro and in vivo and on synergistic potential of α-cypermethrin induced immobilization. Synergy was measured as an increase in α-cypermethrin toxicity after 144h applying a constant non-lethal imazalil concentration of 0.65 μmol/L. The R- and S-imazalil enantiomers increased α-cypermethrin toxicity from an EC50 of 1580 ± 980 pmol/L to an EC50 of 83 ± 10 pmol/L and 53 ± 8 pmol/L, respectively. The relatively small potency difference between imazalil enantiomers could not be explained by the in vitro cytochrome P450 inhibition, as the IC50 values were similar (0.11 ± 0.01 and 0.09 ± 0.01 μmol/L for R- and S-imazalil). Measuring in vivo P450 inhibition and the toxicokinetic of imazalil did not show a clear trend of selectivity towards one or the other enantiomer. The study therefore suggests that cytochrome P450 enzymes involved in detoxification in C. riparius are not enantioselective for imazalil.
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Affiliation(s)
- Janna Kuhlmann
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg, Denmark
| | - Andreas C Kretschmann
- Department of Pharmacy, Analytical Biosciences, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark
| | - Kai Bester
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000, Roskilde, Denmark
| | - Ulla E Bollmann
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000, Roskilde, Denmark
| | - Kristoffer Dalhoff
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg, Denmark
| | - Nina Cedergreen
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg, Denmark.
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Lv T, Carvalho PN, Casas ME, Bollmann UE, Arias CA, Brix H, Bester K. Enantioselective uptake, translocation and degradation of the chiral pesticides tebuconazole and imazalil by Phragmites australis. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 229:362-370. [PMID: 28609737 DOI: 10.1016/j.envpol.2017.06.017] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2017] [Revised: 06/04/2017] [Accepted: 06/06/2017] [Indexed: 06/07/2023]
Abstract
Phytoremediation of realistic environmental concentrations (10 μg L-1) of the chiral pesticides tebuconazole and imazalil by Phragmites australis was investigated. This study focussed on removal dynamics, enantioselective mechanisms and transformation products (TPs) in both hydroponic growth solutions and plant tissues. For the first time, we documented uptake, translocation and metabolisation of these pesticides inside wetland plants, using enantioselective analysis. Tebuconazole and imazalil removal efficiencies from water reached 96.1% and 99.8%, respectively, by the end of the experiment (day 24). Removal from the solutions could be described by first-order removal kinetics with removal rate constants of 0.14 d-1 for tebuconazole and 0.31 d-1 for imazalil. Removal of the pesticides from the hydroponic solution, plant uptake, within plant translocation and degradation occurred simultaneously. Tebuconazole and imazalil concentrations inside Phragmites peaked at day 10 and 5d, respectively, and decreased thereafter. TPs of tebuconazole i.e., (5-(4-Chlorophenyl)-2,2-dimethyl-3-(1H-1,2,4-triazol-1-ylmethyl)-1,3-pentanediol and 5-(3-((1H-1,2,4-Triazol-1-yl)methyl)-3-hydroxy-4,4-dimethylpentyl)-2-chlorophenol) were quantified in solution, while the imazalil TPs (α-(2,4-Dichlorophenyl)-1H-imidazole-1-ethanol and 3-[1-(2,4-Dichlorophenyl)-2-(1H-imidazol-1-yl)ethoxy]-1,2-propanediol) were quantified in both solution and plant tissue. Pesticide uptake by Phragmites was positively correlated with evapotranspiration. Pesticide removal from the hydroponic solution was not enantioselective. However, tebuconazole was degraded enantioselectively both in the roots and shoots. Imazalil translocation and degradation inside Phragmites were also enantioselective: R-imazalil translocated faster than S-imazalil.
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Affiliation(s)
- Tao Lv
- Department of Bioscience, Aarhus University, Aarhus 8000C, Denmark.
| | - Pedro N Carvalho
- Department of Bioscience, Aarhus University, Aarhus 8000C, Denmark.
| | - Mònica Escolà Casas
- Department of Environment Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | - Ulla E Bollmann
- Department of Environment Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | - Carlos A Arias
- Department of Bioscience, Aarhus University, Aarhus 8000C, Denmark
| | - Hans Brix
- Department of Bioscience, Aarhus University, Aarhus 8000C, Denmark
| | - Kai Bester
- Department of Environment Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
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Li R, Dong F, Xu J, Liu X, Wu X, Pan X, Tao Y, Chen Z, Zheng Y. Enantioseparation of Imazalil and Monitoring of Its Enantioselective Degradation in Apples and Soils Using Ultrahigh-Performance Liquid Chromatography-Tandem Mass Spectrometry. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:3259-3267. [PMID: 28383892 DOI: 10.1021/acs.jafc.7b00258] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Imazalil is a widely used systemic chiral fungicide that is still being employed as a racemic mixture without distinguishing the difference between enantiomers, which often leads to its inaccurate risk assessment. In this study, a robust and highly sensitive chiral separation method was developed for imazalil enantiomers by ultrahigh-performance liquid chromatography-tandem mass spectrometry and was further applied to study the degradation dynamics of imazalil enantiomers in apples and field soils at three sites in China. The baseline enantioseparation for imazalil was achieved within 3.5 min on a Lux Cellulose-2 (CCMPC) column with acetonitrile (ACN)/water (65:35, v/v) with a mobile phase at 0.5 mL/min flow rate and a column temperature of 20 °C. The limit of quantitation (LOQ) for each enantiomer was <0.60 μg/kg, with a baseline resolution of approximately 1.75. The research showed that (S)-(+)-imazalil degraded more rapidly than (R)-(-)-imazalil in Gala apples, whereas (R)-(-)-imazalil preferentially degraded in Golden Delicious apples. No significant enantioselectivity was observed in OBIR-2T-47 apples and field soils from the three sites. Results of this study provide useful references for risk assessment and the rational use of imazalil in further agricultural produce practice.
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Affiliation(s)
- Runan Li
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences , Beijing 100193, People's Republic of China
| | - Fengshou Dong
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences , Beijing 100193, People's Republic of China
| | - Jun Xu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences , Beijing 100193, People's Republic of China
| | - Xingang Liu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences , Beijing 100193, People's Republic of China
| | - Xiaohu Wu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences , Beijing 100193, People's Republic of China
| | - Xinglu Pan
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences , Beijing 100193, People's Republic of China
| | - Yan Tao
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences , Beijing 100193, People's Republic of China
| | - Zenglong Chen
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences , Beijing 100193, People's Republic of China
| | - Yongquan Zheng
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences , Beijing 100193, People's Republic of China
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8
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Chi Y, Wu Z, Zhong Y, Dong S. Enantiomeric resolution, stereochemical assignment and toxicity evaluation of TPA enantiomers. Biomed Chromatogr 2017; 31. [DOI: 10.1002/bmc.3924] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 11/11/2016] [Accepted: 12/19/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Yulang Chi
- Key Laboratory of Urban Environment and Health; Institute of Urban Environment, Chinese Academy of Sciences; Xiamen China
- College of Resources and Environment; University of Chinese Academy of Sciences; Beijing China
| | - Zhijun Wu
- School of Life Sciences and Biotechnology; Heilongjiang Bayi Agricultural University; Daqing China
| | - Yi Zhong
- South China Institute of Environmental Sciences; Ministry of Environmental Protection; Guangzhou China
| | - Sijun Dong
- Key Laboratory of Urban Environment and Health; Institute of Urban Environment, Chinese Academy of Sciences; Xiamen China
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