Hydrolysis Kinetics of a Novel 3,4-Dichloroisothiazole Plant-Activator Candidate LY5-24-2 by UPLC-Q-TOF
文献类型： 外文期刊
作者： Song, Shuangyu 1 ; Qiao, Chengkui 2 ; Han, Lijun 1 ; Xie, Hanzhong 2 ; Bi, Yingying 1 ; Qin, Fayi 1 ; Wu, Qifan 3 ; Li, Y 1 ;
作者机构： 1.China Agr Univ, Coll Sci, Beijing 100193, Peoples R China
2.Chinese Acad Agr Sci, Zhengzhou Fruit Res Inst, Zhengzhou 450009, Peoples R China
3.Nankai Univ, Coll Chem, State Key Lab Elementoorgan Chem, Tianjin 300071, Peoples R China
关键词： Hydrolysis; Plant activator; UPLC-Q-TOF; Non-target analysis
期刊名称：BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY （ 影响因子：1.657； 五年影响因子：1.707 ）
ISSN： 0007-4861
年卷期：
页码：
收录情况： SCI
摘要： Hydrolysis characteristics of a novel 3,4-dichloroisothiazole based fungicide with activating plant defense responses as a candidate plant-activator LY5-24-2 were investigated under different conditions (pH and temperature) using ultra-performance liquid chromatography (UPLC) and quadrupole Time-of-Flight (Q-TOF). The hydrolysis case complied with the first-order kinetic model, with half-lives ranging from 4.8 h to 3.2 days at pH 4, 7, 9 and temperature at 25 and 50celcius. One of the hydrolysis metabolite 3,4-dichloroisothiazole-5-carboxylic acid (metabolite 1, M1) was determined and quantified using authentic standard. The other hydrolysate 3-chloro-5-(trifluoromethyl) pyridin-2-amine (metabolite 2, M2) was determined and identified according to accurate mass information, fragmentation patterns and principle component analysis (PCA). By utilizing high-resolution mass spectrometry and multivariate statistical analysis, hydrolysis dynamic of the metabolites was characterized and figured out. This research provided a non-target screening method to analyze hydrolysis metabolites of a new plant-activator and to find its degradation products in aqueous solution.
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