Contamination by neonicotinoid insecticides and their metabolites in Sri Lankan black tea leaves and Japanese green tea leaves

Toxicology Reports
Yoshinori IkenakaMayumi Ishizuka

Abstract

Tea is one of the world's most popular beverages due to health promoting effects. Despite these, there have been concerns about the adverse effects of tea contamination by neonicotinoid insecticides. Only a handful of studies on neonicotinoid insecticides in tea have been carried out and this study was therefore performed to determine the concentrations of seven neonicotinoid insecticides and 20 metabolites in Japanese green tea leaves, and black tea leaves from Sri Lanka; and assess the Maximum Daily Intake (MDI) of neonicotinoid insecticides. From the results, the seven parent compounds were detected in Japanese tea leaves and beverages. Dinotefuran (3004 ng/g) was found at the highest level in green tea leaves. Ten of the 20 metabolites were detected in Japanese tea products. Dinotefuran-urea (92%) and thiacloprid-amide (89%) were most frequently detected in Japanese tea leaves. Clothianidin-urea (100 ng/g) was found at the highest level in green tea leaves. Neonicotinoid insecticides and metabolites were not detected in Sri Lankan black tea leaves. The concentrations and MDI of neonicotinoid insecticides in tea leaves were below the Maximum Residual Levels (MRLs) and Acceptable Daily Intakes (ADIs), respectively.

Citations

Mar 19, 2020·Archives of Microbiology·Aisha Lawan IdrisTianpei Huang
Jan 30, 2019·Journal of Toxicology·Lesa A Thompson, Wageh S Darwish
Jan 18, 2019·Luminescence : the Journal of Biological and Chemical Luminescence·E J Llorent-MartínezA Ruiz-Medina
Jan 26, 2021·The Journal of Veterinary Medical Science·Collins NimakoMayumi Ishizuka
Sep 27, 2020·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Kraisiri KhidkhanMayumi Ishizuka
Apr 7, 2021·Environmental Toxicology and Chemistry·Collins NimakoMayumi Ishizuka
Jun 11, 2021·Journal of the Science of Food and Agriculture·Tzu-Hsuen YuanChang-Chuan Chan

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