Nimako Collins, Hirai Anri, Ichise Takahiro, Akoto Osei, Nakayama Shouta M M, Taira Kumiko, Fujioka Kazutoshi, Ishizuka Mayumi, Ikenaka Yoshinori
Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Hokkaido, Japan.
Chemistry Department, Kwame Nkrumah University of Science and Technology, Ghana.
Toxicol Rep. 2021 Sep 15;8:1657-1664. doi: 10.1016/j.toxrep.2021.09.002. eCollection 2021.
The current study sought to assess the residual levels of neonicotinoid insecticides (NEO) in organic and conventional green tea leaves produced in Japan. A total of 103 tea leaves (thus, 42 organic and 61 conventional), were sampled from grocery stores in Japan. Concentrations of NEOs in the tea leaves were quantified using LC-MS/MS; and the data was used to estimate maximum daily intakes of NEOs within the Japanese population. Seven native NEO compounds and one NEO metabolite were detected in both organic and conventional tea leaves. Detection frequencies (%Dfs) of NEOs in the tea samples (n = 103) were found in the decreasing order; thiacloprid (84.47 %) > dinotefuran (74.76 %) > imidacloprid (69.90 %) ≈ clothianidin (69.90 %) > dm-acetamiprid (63.11 %) > thiamethoxam (58.25 %) > acetamiprid (4.85 %) > nitenpyram (1.94 %). About 94.20 % of the tea leaves contained two or more NEO compounds simultaneously. The %Dfs of NEOs were relatively lower in organic tea leaves, compared to the conventional tea leaves. Various percentile concentrations of NEOs were far lower in organic tea leaves, compared to the conventional tea leaves. The maximum daily intakes of NEOs through consumption of tea (MDIgt) were also lower for organic tea leaves, compared to the conventional tea samples.
本研究旨在评估日本生产的有机和传统绿茶中新型烟碱类杀虫剂（NEO）的残留水平。从日本的杂货店共采集了103份茶叶样本（其中42份有机茶叶和61份传统茶叶）。使用液相色谱 - 串联质谱法（LC-MS/MS）对茶叶中NEOs的浓度进行定量；并将数据用于估算日本人群中NEOs的最大日摄入量。在有机和传统茶叶中均检测到七种天然NEO化合物和一种NEO代谢物。在茶叶样本（n = 103）中，NEOs的检测频率（%Dfs）从高到低依次为：噻虫啉（84.47%）> 呋虫胺（74.76%）> 吡虫啉（69.90%）≈ 噻虫胺（69.90%）> 脱甲基啶虫脒（63.11%）> 噻虫嗪（58.25%）> 啶虫脒（4.85%）> 烯啶虫胺（1.94%）。约94.20%的茶叶同时含有两种或更多种NEO化合物。与传统茶叶相比，有机茶叶中NEOs的%Dfs相对较低。与传统茶叶相比，有机茶叶中NEOs的各种百分位数浓度要低得多。与传统茶叶样本相比，通过饮用茶叶摄入NEOs的最大日摄入量（MDIgt）在有机茶叶中也较低。
