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Neonicotinoid residues in commercial Japanese tea leaves produced by organic and conventional farming methods
| Title: | Neonicotinoid residues in commercial Japanese tea leaves produced by organic and conventional farming methods |
| Authors: | Nimako, Collins Browse this author | | Hirai, Anri Browse this author | | Ichise, Takahiro Browse this author | | Akoto, Osei Browse this author | | Nakayama, Shouta M. M. Browse this author →KAKEN DB | | Taira, Kumiko Browse this author →KAKEN DB | | Fujioka, Kazutoshi Browse this author | | Ishizuka, Mayumi Browse this author →KAKEN DB | | Ikenaka, Yoshinori Browse this author →KAKEN DB |
| Keywords: | Neonicotinoid insecticide | | Conventional tea leaves | | Organic tea leaves |
| Issue Date: | 1-Jan-2021 |
| Publisher: | Elsevier |
| Journal Title: | Toxicology reports |
| Volume: | 8 |
| Start Page: | 1657 |
| End Page: | 1664 |
| Publisher DOI: | 10.1016/j.toxrep.2021.09.002 |
| Abstract: | 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 %) approximate to clothianidin (69.90 %) > dmacetamiprid (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. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/83757 |
| Appears in Collections: | 獣医学院・獣医学研究院 (Graduate School of Veterinary Medicine / Faculty of Veterinary Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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