Degradation and residues of indoxacarb enantiomers in rice plants, rice hulls and brown rice using enriched S-indoxacarb formulation and enantiopure formulation
Degradation and residues of indoxacarb enantiomers in rice plants, rice hulls and brown rice using enriched S-indoxacarb formulation and enantiopure formulation
复制标题
使用富集 S-茚虫威制剂和对映体纯制剂对水稻、稻壳和糙米中茚虫威对映体的降解和残留
DOI：
10.1002/bmc.4301
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发表时间：
2018
影响因子：
1.8
通讯作者：
Deyu Hu
中科院分区：
文献类型：
--
作者：
Lihong Shi;Ting Gui;Shan Zhao;Jin Xu;Fei Wang;Changling Sui;Yuping Zhang;Deyu Hu
建立了手性液相色谱-串联高分辨率质谱方法，用于分析水稻、稻壳和糙米中的茚虫威对映体。两种对映体的手性分离是在保持在 20°C 的 Superchiral S-OD 柱上进行的，并用 0.3mL/min 的甲醇洗脱。样品用乙腈溶液超声提取，并通过分散固相萃取 50 mg 伯仲胺和 50 mg C18 进行净化。该方法成功用于研究富集S-茚虫威（2.33S/1R）和纯S-茚虫威两种对映体在水稻中的降解和残留。在贵州和湖南富集S-茚虫威降解过程中，R-茚虫威和S-茚虫威在水稻植株中的半衰期分别为4.20-4.33和3.45-3.57天，而纯S-茚虫威在贵州和湖南的水稻植株半衰期分别为2.68和3.69天。结果表明，在纯S-茚虫威在水稻植株中的整个实验期间，发生了优先降解并且没有对映体转化。施用茚虫威SC和茚虫威EC后，糙米中茚虫威对映体的最终残留浓度明显低于同一稻田稻株和稻壳中的茚虫威对映体最终残留浓度。
A chiral liquid chromatography–tandem high resolution mass spectroscopic method was developed for the analysis of indoxacarb enantiomers in rice plants, rice hulls and brown rice. Chiral separation of two enantiomers was carried out on a Superchiral S‐OD column maintained at 20°C and eluted with 0.3 mL/min methanol. Samples were extracted by acetonitrile solution with ultrasound and cleansed by dispersive solid‐phase extraction of 50 mg of primary secondary amine and 50 mg of C18. This method was successfully used to study the degradation and residues of two enantiomers with enrichedS‐indoxacarb (2.33S/1R) and pureS‐indoxacarb in rice plants. The half‐lives ofR‐indoxacarb andS‐indoxacarb were 4.20–4.33 and 3.45–3.57 days in rice plants during the degradation of enrichedS‐indoxacarb in Guizhou and Hunan, respectively, whereas the half‐lives of pureS‐indoxacarb were 2.68 and 3.69 days in Guizhou and Hunan, respectively. The results indicated that preferentialS‐indoxacarb degradation occurred and that enantiomeric transformation was absent in the total experiment periods of pureS‐indoxacarb in rice plants. The final residue concentrations of indoxacarb enantiomers in brown rice were significantly less than those in rice plants and rice hulls in the same rice field after applying indoxacarb SC and indoxacarb EC.