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Liu B, Peng Q, Sheng M, Ni H, Xiao X, Tao Q, He Q, He J. Isolation and Characterization of a Topramezone-Resistant 4-Hydroxyphenylpyruvate Dioxygenase from Sphingobium sp. TPM-19. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:1022-1029. [PMID: 31884791 DOI: 10.1021/acs.jafc.9b06871] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Topramezone is a 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor. Due to its broad-spectrum, high efficiency, and low toxicity, topramezone is a candidate herbicide for the construction of genetically modified (GM) herbicide-resistant crops. In the present study, we screened a topramezone-resistant isolate Sphingobium sp. TPM-19 and cloned a topramezone-resistant HPPD gene (SphppD) from this isolate. SpHPPD shared the highest similarity (53%) with an HPPD from Vibrio vulnificus CMCP6. SpHPPD was synthesized in Escherichia coli BL21(DE3) and purified to homogeneity using Co2+-affinity chromatography. SpHPPD was found to be a monomer. The Km and kcat of SpHPPD for 4-hydroxyphenylpyruvate (4-HPP) were 82.8 μM and 15.0 s-1, respectively. SpHPPD showed high resistance to topramezone with half maximal inhibitory concentration (IC50) and Ki values of 5.2 and 2.5 μM, respectively. Additionally, SpHPPD also showed high resistance to isoxaflutole (DKN) (IC50: 8.7 μM; Ki: 6.0 μM) and mesotrione (IC50: 4.2 μM; Ki: 1.3 μM) and moderate resistance to tembotrione (IC50: 2.5 μM; Ki: 1.0 μM). The introduction of the SphppD gene into Arabidopsis thaliana enhanced obvious resistance against topramezone. In conclusion, this study provides a novel topramezone-resistant HPPD gene for the genetic engineering of GM herbicide-resistant crops.
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Affiliation(s)
- Bin Liu
- Department of Microbiology, Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Sciences , Nanjing Agricultural University , Nanjing 210095 , Jiangsu , P. R. China
| | - Qian Peng
- Department of Microbiology, Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Sciences , Nanjing Agricultural University , Nanjing 210095 , Jiangsu , P. R. China
| | - Mengyao Sheng
- Department of Microbiology, Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Sciences , Nanjing Agricultural University , Nanjing 210095 , Jiangsu , P. R. China
| | - Haiyan Ni
- College of Life Science , Jiangxi Normal University , Nanchang 330022 , Jiangxi , China
| | - Xiang Xiao
- DBN Biotech Center, Beijing DBN Technology Group Co., Ltd. , Beijing 100193 , P. R. China
| | - Qing Tao
- DBN Biotech Center, Beijing DBN Technology Group Co., Ltd. , Beijing 100193 , P. R. China
| | - Qin He
- Department of Microbiology, Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Sciences , Nanjing Agricultural University , Nanjing 210095 , Jiangsu , P. R. China
| | - Jian He
- Department of Microbiology, Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Sciences , Nanjing Agricultural University , Nanjing 210095 , Jiangsu , P. R. China
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Xue M, Wu H, Liu S, Huang X, Jin Q, Ren R. Simultaneous determination of 44 pharmaceutically active compounds in water samples using solid-phase extraction coupled with ultra-performance liquid chromatography-tandem mass spectrometry. Anal Bioanal Chem 2019; 412:203-222. [DOI: 10.1007/s00216-019-02229-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 10/21/2019] [Indexed: 02/01/2023]
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Lygin AV, Kaundun SS, Morris JA, Mcindoe E, Hamilton AR, Riechers DE. Metabolic Pathway of Topramezone in Multiple-Resistant Waterhemp ( Amaranthus tuberculatus) Differs From Naturally Tolerant Maize. FRONTIERS IN PLANT SCIENCE 2018; 9:1644. [PMID: 30519248 PMCID: PMC6258821 DOI: 10.3389/fpls.2018.01644] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Accepted: 10/23/2018] [Indexed: 05/08/2023]
Abstract
Waterhemp [Amaranthus tuberculatus (Moq.) Sauer] is a problematic dicot weed in maize, soybean, and cotton production in the United States. Waterhemp has evolved resistance to several commercial herbicides that inhibit the 4-hydroxyphenylpyruvate-dioxygenase (HPPD) enzyme in sensitive dicots, and research to date has shown that HPPD-inhibitor resistance is conferred by rapid oxidative metabolism of the parent compound in resistant populations. Mesotrione and tembotrione (both triketones) have been used exclusively to study HPPD-inhibitor resistance mechanisms in waterhemp and a related species, A. palmeri (S. Wats.), but the commercial HPPD inhibitor topramezone (a pyrazolone) has not been investigated from a mechanistic standpoint despite numerous reports of cross-resistance in the field and greenhouse. The first objective of our research was to determine if two multiple herbicide-resistant (MHR) waterhemp populations (named NEB and SIR) metabolize topramezone more rapidly than two HPPD inhibitor-sensitive waterhemp populations (named SEN and ACR). Our second objective was to determine if initial topramezone metabolite(s) detected in MHR waterhemp are qualitatively different than those formed in maize. An excised leaf assay and whole-plant study investigated initial rates of topramezone metabolism (<24 h) and identified topramezone metabolites at 48 hours after treatment (HAT), respectively, in the four waterhemp populations and maize. Results indicated both MHR waterhemp populations metabolized more topramezone than the sensitive (SEN) population at 6 HAT, while only the SIR population metabolized more topramezone than SEN at 24 HAT. Maize metabolized more topramezone than any waterhemp population at each time point examined. LC-MS analysis of topramezone metabolites at 48 HAT showed maize primarily formed desmethyl and benzoic acid metabolites, as expected based on published reports, whereas SIR formed two putative hydroxylated metabolites. Subsequent LC-MS/MS analyses identified both hydroxytopramezone metabolites in SIR as different hydroxylation products of the isoxazole ring, which were also present in maize 48 HAT but at very low levels. These results indicate that SIR initially metabolizes and detoxifies topramezone in a different manner than tolerant maize.
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Affiliation(s)
- Anatoli V. Lygin
- Department of Crop Sciences, University of Illinois at Urbana–Champaign, Urbana, IL, United States
| | - Shiv S. Kaundun
- Syngenta, Jealott’s Hill International Research Centre, Bracknell, United Kingdom
| | - James A. Morris
- Syngenta, Jealott’s Hill International Research Centre, Bracknell, United Kingdom
| | - Eddie Mcindoe
- Syngenta, Jealott’s Hill International Research Centre, Bracknell, United Kingdom
| | - Andrea R. Hamilton
- Department of Chemistry, Truman State University, Kirksville, MO, United States
| | - Dean E. Riechers
- Department of Crop Sciences, University of Illinois at Urbana–Champaign, Urbana, IL, United States
- *Correspondence: Dean E. Riechers,
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Zhao F, Xiang Q, Zhou Y, Xu X, Qiu X, Yu Y, Ahmad F. Evaluation of the toxicity of herbicide topramezone to Chlorella vulgaris: Oxidative stress, cell morphology and photosynthetic activity. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2017; 143:129-135. [PMID: 28525816 DOI: 10.1016/j.ecoenv.2017.05.022] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 05/08/2017] [Accepted: 05/11/2017] [Indexed: 06/07/2023]
Abstract
Topramezone is a new, highly selective herbicide of pyrazole structure for the post-emergence control of broadleaf and grass weeds in corn. In this study, the effects of topramezone on C. vulgaris, especially in relation to the cell growth, oxidative stress, cell morphology and photosynthetic activity were assessed. Results showed that topramezone treatment was detrimental to C. vulgaris growth during the 24-96h of exposure. The changes in cells pigments content and relative transcript of photosynthesis-related genes, which implies that topramezone disrupted the photosynthetic system. Moreover, topramezone induced membrane permeability in a significant proportion of cells with a maximum damage rate of 40.40%, and morphology of cells was more complicated than the control group. TEM images also revealed that topramezone compromised the integrity of the cells. The data corroborated topramezone induced ROS triggered oxidative stress, leading to an increase of MDA. These results suggested that topramezone could have significant effects on growth and physiological functions in algae species, and we supposed that this herbicide affected all of these parameters and the observed effects can be explained by the generation of oxidative stress. This research helps to understand how topramezone affects C. vulgaris and provides a scientific basis for applications of topramezone in aquatic environment.
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Affiliation(s)
- Fangfang Zhao
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, China; Research Center of Analysis and Measurement, Zhejiang University of Technology, Hangzhou, China.
| | - Qingqing Xiang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, China; Research Center of Analysis and Measurement, Zhejiang University of Technology, Hangzhou, China
| | - Ying Zhou
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, China; Research Center of Analysis and Measurement, Zhejiang University of Technology, Hangzhou, China.
| | - Xiao Xu
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, China; Research Center of Analysis and Measurement, Zhejiang University of Technology, Hangzhou, China
| | - Xinyi Qiu
- Albert College, 160 Dundas Street West Belleville, Ontario, China
| | - Yi Yu
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, China; Research Center of Analysis and Measurement, Zhejiang University of Technology, Hangzhou, China
| | - Farooq Ahmad
- State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai, China
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Zhou Q, Li F, Chen L, Jiang D. Quantitative Analysis of 10 Mycotoxins in Wheat Flour by Ultrahigh Performance Liquid Chromatography-Tandem Mass Spectrometry with a Modified QuEChERS Strategy. J Food Sci 2016; 81:T2886-T2890. [PMID: 27732757 DOI: 10.1111/1750-3841.13524] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 08/17/2016] [Accepted: 09/11/2016] [Indexed: 12/25/2022]
Abstract
A simple and sensitive analytical method for quantitative analysis of 10 mycotoxins was developed and validated by a combination of modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) procedure with ultrahigh performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). Sample preparation involved QuEChERS with dispersive solid phase extraction for clean-up, and analysis was performed by reversed-phase UHPLC-MS/MS using electrospray negative ionization and multiple reaction monitoring. Under optimized conditions, the calibration curves displayed good linear relationships with all coefficients of determinations (r2 ) higher than 0.998. The limits of quantification for all target mycotoxins were lower than 7 μg/kg. Trueness and precision for the analytes were 70% to 116% average recoveries and 2% to 13% relative standard deviations (RSDs). The validated method was used to analyze 46 wheat flour samples for the targeted mycotoxins. The method can be used as a rapid and robust tool for screening mycotoxin in cereal products.
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Affiliation(s)
- Qingxin Zhou
- Inst. of Agro-Food Science & Technology, Shandong Academy of Agricultural Sciences/Shandong Provincial Key Laboratory of Deep Processing Technology of Agricultural Product, 250100, Jinan, People's Republic of China
| | - Fenghua Li
- Inst. of Agro-Food Science & Technology, Shandong Academy of Agricultural Sciences/Shandong Provincial Key Laboratory of Deep Processing Technology of Agricultural Product, 250100, Jinan, People's Republic of China.,Dept. of Chemistry and Physics, Shandong Center for Food Safety Risk Assessment, Shandong Center for Disease Control and Prevention, 250014, Jinan, People's Republic of China
| | - Leilei Chen
- Inst. of Agro-Food Science & Technology, Shandong Academy of Agricultural Sciences/Shandong Provincial Key Laboratory of Deep Processing Technology of Agricultural Product, 250100, Jinan, People's Republic of China
| | - Dafeng Jiang
- Inst. of Agro-Food Science & Technology, Shandong Academy of Agricultural Sciences/Shandong Provincial Key Laboratory of Deep Processing Technology of Agricultural Product, 250100, Jinan, People's Republic of China.,Dept. of Chemistry and Physics, Shandong Center for Food Safety Risk Assessment, Shandong Center for Disease Control and Prevention, 250014, Jinan, People's Republic of China
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Li Y, Liu X, Wu X, Dong F, Xu J, Zheng Y. Simultaneous determination of flupyradifurone and its two metabolites in fruits, vegetables, and grains by a modified quick, easy, cheap, effective, rugged, and safe method using ultra high performance liquid chromatography with tandem mass spectrometry. J Sep Sci 2016; 39:1090-8. [DOI: 10.1002/jssc.201501186] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Revised: 12/16/2015] [Accepted: 01/04/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Yao Li
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection, Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Xingang Liu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection, Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Xiaohu Wu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection, Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Fengshou Dong
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection, Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Jun Xu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection, Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Yongquan Zheng
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection, Chinese Academy of Agricultural Sciences; Beijing P.R. China
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Jiao Y, Li F, Jiang D, Li W, Chen J. Determination of Isomaltooligosaccharides in Milk Powder by Ultra-High Performance Liquid Chromatography–Tandem Mass Spectrometry. ANAL LETT 2015. [DOI: 10.1080/00032719.2015.1077337] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Dong X, Liang S, Shi Z, Sun H. Development of multi-residue analysis of herbicides in cereal grain by ultra-performance liquid chromatography-electrospray ionization-mass spectrometry. Food Chem 2015; 192:432-40. [PMID: 26304370 DOI: 10.1016/j.foodchem.2015.07.025] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 11/23/2014] [Accepted: 07/07/2015] [Indexed: 11/24/2022]
Abstract
A rapid and sensitive method was developed for the determination of 50 herbicides in cereal grain by ultra-performance liquid chromatography-electrospray ionization-mass spectrometry (UPLC-ESI-MS). Using acetonitrile effectively extracted 22 kinds of triazine and other basic herbicides, and using 90:10 v/v acetonitrile-phosphate buffer (pH = 7.5) effectively extracted other 28 herbicides. Chromatographic separation was achieved using gradient elution with acetonitrile-water as a mobile phase for 22 triazine and phenylurea herbicides and with 5mM ammonium acetate aqueous solution containing 0.1% formic acid-acetonitrile as a mobile phase for other 28 herbicides. Using matrix-matched standard calibration curve effectively reduced the indirect matrix effects, ensured accurate quantification for these herbicides. The response was linear over two orders of magnitude with a correlation coefficients (r(2)) higher than 0.992. The limits of quantification for the herbicides varied from 0.2 to 25.6 μg kg(-1). The intra- and inter-day precisions (relative standard deviation, RSD) were 2.2-9.3% and 5.7-17.1%, respectively. The recovery varied from 61.6% to 110% with the RSD of 1.6-11.8%. Analyzing soybean, corn and wheat samples from 17 counties evaluated this method. The developed and validated method has high sensitivity, satisfactory recovery and precision, can ensure the multi-class multi-residue analysis at low μg kg(-1) level for the most herbicides in cereal grain.
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Affiliation(s)
- Xinfeng Dong
- College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China; Shijiazhuang Center for Disease Control and Prevention of Hebei Province, Shijiazhuang 050000, China
| | - Shuxuan Liang
- College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China
| | - Zhihong Shi
- College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China
| | - Hanwen Sun
- College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China.
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Ribeiro C, Ribeiro AR, Maia AS, Gonçalves VMF, Tiritan ME. New trends in sample preparation techniques for environmental analysis. Crit Rev Anal Chem 2015; 44:142-85. [PMID: 25391434 DOI: 10.1080/10408347.2013.833850] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Environmental samples include a wide variety of complex matrices, with low concentrations of analytes and presence of several interferences. Sample preparation is a critical step and the main source of uncertainties in the analysis of environmental samples, and it is usually laborious, high cost, time consuming, and polluting. In this context, there is increasing interest in developing faster, cost-effective, and environmentally friendly sample preparation techniques. Recently, new methods have been developed and optimized in order to miniaturize extraction steps, to reduce solvent consumption or become solventless, and to automate systems. This review attempts to present an overview of the fundamentals, procedure, and application of the most recently developed sample preparation techniques for the extraction, cleanup, and concentration of organic pollutants from environmental samples. These techniques include: solid phase microextraction, on-line solid phase extraction, microextraction by packed sorbent, dispersive liquid-liquid microextraction, and QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe).
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Affiliation(s)
- Cláudia Ribeiro
- a CESPU, Instituto de Investigação e Formação Avançada em Ciências e Tecnologias da Saúde , Gandra , Portugal
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Pan X, Dong F, Xu J, Liu X, Cheng Y, Chen Z, Liu N, Chen X, Tao Y, Zheng Y. Comparison of different cleanup procedures for oil crops based on the development of a trace analytical method for the determination of pyraclostrobin and epoxiconazole. J Sep Sci 2014; 37:3669-76. [DOI: 10.1002/jssc.201400596] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 09/22/2014] [Accepted: 09/28/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Xinglu Pan
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection; Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Fengshou Dong
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection; Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Jun Xu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection; Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Xingang Liu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection; Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Youpu Cheng
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection; Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Zenglong Chen
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection; Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Na Liu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection; Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Xixi Chen
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection; Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Yan Tao
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection; Chinese Academy of Agricultural Sciences; Beijing P.R. China
| | - Yongquan Zheng
- State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection; Chinese Academy of Agricultural Sciences; Beijing P.R. China
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Zuo HG, Zhu JX, Zhan CR, Tang GY, Guo P, Wei YL, Zeng HL, Yang H. A method developed for determination of heptachlor and its metabolites from pork. ENVIRONMENTAL MONITORING AND ASSESSMENT 2014; 186:2399-2412. [PMID: 24337977 DOI: 10.1007/s10661-013-3547-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Accepted: 11/12/2013] [Indexed: 06/03/2023]
Abstract
A new method has been developed to determine heptachlor and its metabolites heptachlor-exo-epoxide and heptachlor-endo-epoxide in pork. The pork samples were extracted with acetone-n-hexane (2:8, V:V) and cleaned up by gel permeation chromatography and florisil solid-phase extraction cartridge. The extract was then determined by gas chromatography equipped with electron capture detector (GC-ECD), followed by validation using gas chromatography-mass spectrometry (GC-MS) with negative chemical ionization. Linearity of calibration curves ranged from 0.01 to 0.5 mg L(-1), with correlation coefficients of more than 0.9980 for GC-ECD and GC-MS, respectively. At spiked concentrations of 0.01, 0.05, and 0.1 mg kg(-1), the average recovery and relative standard deviation values were 87.1-102.2 and 4.0-11.3%, respectively. The limit of quantification for each analyte was 0.01 mg kg(-1), which satisfied the current maximum residue limit permitted in pork. Our results showed that the method developed was successfully used to determine heptachlor and heptachlor epoxide residues in real pork samples.
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Affiliation(s)
- Hai Gen Zuo
- Jiangsu Key Laboratory of Pesticide Science, College of Science, Nanjing Agricultural University, Nanjing, 210095, China
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Wu X, Xu J, Dong F, Liu X, Li Y, Zheng Y. Simultaneous determination of oxathiapiprolin and two metabolites in fruits, vegetables and cereal using a modified quick, easy, cheap, effective, rugged, and safe method and liquid chromatography coupled to tandem mass spectrometry. J Chromatogr A 2014; 1329:30-7. [DOI: 10.1016/j.chroma.2013.12.087] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2013] [Revised: 12/27/2013] [Accepted: 12/31/2013] [Indexed: 11/29/2022]
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The mechanism of methylated seed oil on enhancing biological efficacy of topramezone on weeds. PLoS One 2013; 8:e74280. [PMID: 24086329 PMCID: PMC3782475 DOI: 10.1371/journal.pone.0074280] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Accepted: 07/29/2013] [Indexed: 11/19/2022] Open
Abstract
Methylated seed oil (MSO) is a recommended adjuvant for the newly registered herbicide topramezone in China and also in other countries of the world, but the mechanism of MSO enhancing topramezone efficacy is still not clear. Greenhouse and laboratory experiments were conducted to determine the effects of MSO on efficacy, solution property, droplet spread and evaporation, active ingredient deposition, foliar absorption and translocation of topramezone applied to giant foxtail (Setaria faberi Herrm.) and velvetleaf (Abutilon theophrasti Medic.). Experimental results showed that 0.3% MSO enhanced the efficacy of topramezone by 1.5-fold on giant foxtail and by 1.0-fold on velvetleaf. When this herbicide was mixed with MSO, its solution surface tension and leaf contact angle decreased significantly, its spread areas on weed leaf surfaces increased significantly, its wetting time was shortened on giant foxtail but not changed on velvetleaf, and less of its active ingredient crystal was observed on the treated weed leaf surfaces. MSO increased the absorption of topramezone by 68.9% for giant foxtail and by 45.9% for velvetleaf 24 hours after treatment. It also apparently promoted the translocation of this herbicide in these two weeds.
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14
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The behavior of chlorpyrifos and its metabolite 3,5,6-trichloro-2-pyridinol in tomatoes during home canning. Food Control 2013. [DOI: 10.1016/j.foodcont.2012.11.050] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Wu X, Xu J, Liu X, Dong F, Wu Y, Zhang Y, Zheng Y. Determination of Herbicide Propisochlor in Soil, Water and Rice by Quick, Easy, Cheap, Effective, Rugged and Safe (QuEChERS) Method Using by UPLC-ESI-MS/MS. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.3.917] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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16
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Gabudean AM, Biro D, Astilean S. Hybrid plasmonic platforms based on silica-encapsulated gold nanorods as effective spectroscopic enhancers for Raman and fluorescence spectroscopy. NANOTECHNOLOGY 2012; 23:485706. [PMID: 23138835 DOI: 10.1088/0957-4484/23/48/485706] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Surface-enhanced Raman scattering (SERS) nano-tags are of increasing interest in biomedical research as viable alternatives to bio-imaging techniques based on semiconductor quantum dots or fluorescent molecules. In this work, we fabricate silica-coated gold nanorods (AuNRs) encoded with two molecular labels to operate as highly effective spectroscopic nano-tags in near-infrared SERS (NIR-SERS) and surface-enhanced resonance Raman scattering combined with metal-enhanced fluorescence (SERRS-MEF), respectively. Specifically, a non-fluorescent molecule with strong affinity for a gold surface (para-aminothiophenol, p-ATP) and a common dye (Nile Blue, NB) with lower affinity have been successfully tested as NIR-SERS nano-tags under laser excitation at 785 nm. Moreover, as a result of designing AuNRs with a plasmon resonance band overlapping the electronic absorption band of the encoded NB molecule, a dual SERRS and MEF performance has been devised under resonant excitation at 633 nm. We explain this result by considering a partial desorption of NB molecules from the metal surface and their trapping into the silica shell at favorable distances to avoid quenching and enhance the fluorescence signal. Finally, we prove that the silica shell prevents the desorption or chemical transformation of p-ATP into p,p'-dimercaptoazobenzene species, as previously noticed, thus providing a highly stable SERRS signal, which is crucial for imaging applications.
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Affiliation(s)
- A M Gabudean
- Nanobiophotonics Center, Interdisciplinary Research Institute in Bio-Nano-Sciences and Faculty of Physics, Babes-Bolyai University, Cluj-Napoca, Romania
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Simultaneous determination of five pyrazole fungicides in cereals, vegetables and fruits using liquid chromatography/tandem mass spectrometry. J Chromatogr A 2012; 1262:98-106. [DOI: 10.1016/j.chroma.2012.08.100] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Revised: 08/29/2012] [Accepted: 08/31/2012] [Indexed: 11/20/2022]
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González-Curbelo MÁ, Herrera-Herrera AV, Ravelo-Pérez LM, Hernández-Borges J. Sample-preparation methods for pesticide-residue analysis in cereals and derivatives. Trends Analyt Chem 2012. [DOI: 10.1016/j.trac.2012.04.010] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Bakar NBA, Makahleh A, Saad B. In-vial liquid–liquid microextraction-capillary electrophoresis method for the determination of phenolic acids in vegetable oils. Anal Chim Acta 2012; 742:59-66. [DOI: 10.1016/j.aca.2012.02.045] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Revised: 02/03/2012] [Accepted: 02/27/2012] [Indexed: 10/28/2022]
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Geng Y, Jia R, Li C, Ma X, Lin Y. Dissipation and residue determination of fluoroglycofen-ethyl in soybean and soil by UPLC-MS-MS. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2012; 89:669-73. [PMID: 22752219 DOI: 10.1007/s00128-012-0681-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2012] [Accepted: 05/07/2012] [Indexed: 06/01/2023]
Abstract
A rapid, highly selective, and sensitive method was developed for detecting fluoroglycofen-ethyl in soybean seed, plant, and soil using UPLC-MS-MS. The detection limits of fluoroglycofen-ethyl in soybean seed, plant, and soil were 0.5, 1, and 1 μg kg(-1), respectively. Recoveries ranged from 83.4% to 99.2%, in which intra-day RSDs were from 1.3% to 6.7% and inter-day RSDs were from 1.9% to 7.0%. In the dissipation study, the half-lives of fluoroglycofen-ethyl were 34.8 (Shanxi) and 48.5 h (Heilongjiang) in soil and 43.3 h in soybean plant in both locations. The residues of fluoroglycofen-ethyl in all samples were below LODs 30 days before and during harvest.
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Affiliation(s)
- Yue Geng
- College of Science, China Agricultural University, Beijing, 100193, China
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Correia-Sá L, Fernandes VC, Carvalho M, Calhau C, Domingues VF, Delerue-Matos C. Optimization of QuEChERS method for the analysis of organochlorine pesticides in soils with diverse organic matter. J Sep Sci 2012; 35:1521-30. [DOI: 10.1002/jssc.201200087] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Luísa Correia-Sá
- REQUIMTE; Instituto Superior de Engenharia do Porto; Porto Portugal
- FCNAUP; Porto Portugal
| | - Virgínia C. Fernandes
- REQUIMTE; Instituto Superior de Engenharia do Porto; Porto Portugal
- CIQ (Investigation Centre); Porto Portugal
| | - Manuela Carvalho
- REQUIMTE; Instituto Superior de Engenharia do Porto; Porto Portugal
| | - Conceição Calhau
- Department of Biochemistry (U38-FCT); Faculty of Medicine; University of Porto, Porto Portugal
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