Chen Hongping, Gao Guanwei, Yin Peng, Dai Jinxia, Chai Yunfeng, Liu Xin, Lu Chengyin
a Tea Research Institute, Chinese Academy of Agricultural Sciences , Hangzhou , China.
b Key Laboratory of Tea Quality and Safety, Ministry of Agriculture , Hangzhou , China.
Food Addit Contam Part A Chem Anal Control Expo Risk Assess. 2018 Oct;35(10):2000-2010. doi: 10.1080/19440049.2018.1497306. Epub 2018 Sep 6.
This study aimed to determine the residues of fipronil, metabolites, and enantiomers in tea (Camellia sinensis) during tea planting and green tea manufacture. An AD-RH chiral column was used to separate the fipronil enantiomers. During tea planting, the half-lives of the sum of fipronil and metabolites were similar to those of fipronil, which were 2.37 and 3.88 days for tea shoots and mature leaves, respectively. The residues of fipronil and its metabolites increased 2.3-3.6-fold during green tea manufacture. The values for the processing factors of fipronil and metabolites ranged from 1.0 to 2.1. A slightly significant enantioselectivity of (R)- and (S)-fipronil was observed during tea planting and green tea manufacturing. The residue pattern indicated that fipronil should not be applied in tea gardens due to its long persistence. The maximum residual limits of fipronil and metabolites at 2 μg kg were considered optimal.
本研究旨在测定茶树种植和绿茶加工过程中茶叶（茶树）中氟虫腈、代谢物及对映体的残留量。采用AD-RH手性柱分离氟虫腈对映体。在茶树种植过程中，氟虫腈及其代谢物总量的半衰期与氟虫腈相似，茶梢和成熟叶中的半衰期分别为2.37天和3.88天。在绿茶加工过程中，氟虫腈及其代谢物的残留量增加了2.3至3.6倍。氟虫腈及其代谢物的加工因子值在1.0至2.1之间。在茶树种植和绿茶加工过程中观察到（R）-和（S）-氟虫腈有轻微的对映体选择性。残留模式表明，由于氟虫腈持久性长，不应在茶园中使用。氟虫腈及其代谢物2 μg/kg的最大残留限量被认为是最佳的。
