Neonicotinoid residues in commercial Japanese tea leaves produced by organic and conventional farming methods

• 全文链接

有机和传统耕作方法生产的日本商品茶叶中新烟碱类残留

关键词：

来源：

Toxicology Reports 期刊

全文链接：

//agri.nais.net.cn/topic/downloadFile/9dcca8b4-4b7b-4a57-a0ef-b541db02f795

来源地址：

https://www.sciencedirect.com/science/article/pii/S2214750021001670

资源所属：

茶学研究专题

类型：

学术文献

语种：

英语

原文发布日期：

2021-09-15

摘要：

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.