Investigation in tea on fate of fenazaquin residue and its transfer in brew

Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association
Vipin KumarA Shanker

Abstract

Fenazaquin is a non-systemic acaricide/insecticide used widely in controlling mites and other related pests in fruits, vegetables and tea. The objective of this research was to investigate the disappearance trend in tea of fenazaquin residue level and its transfer in brew. Fenazaquin was applied on a tea crop at two rates, 125 and 250 g AI/ha in wet and dry seasons under field conditions. Samples (green shoots, made tea and its brew) were analyzed for fenazaquin and quantification was by high performance liquid chromatography using a UV detector. The residue dissipated faster in the wet season than in the dry season. Seven days after the treatment (normal round of plucking) the residues observed in the green shoots at the two rates were 2.17, 3.07 mg/kg and 2.04, 2.84 mg/kg in the wet and dry seasons, respectively. However, the degradation rale in both seasons followed first-order kinetics. Half-lives in green shoots were in range 1.43-1.70 and 2.10-2.21 days and in made tea 1.59-1.73 and 1.87-1.94 days for wet and dry seasons, respectively. During processing of green shoots to made tea considerable loss (42-70%) of residue was observed. The transfer of residue from made tea brew was in the range 3-22%. In brew residue were bel...Continue Reading

References

Jul 1, 1991·Food Additives and Contaminants·H WanZ Chen
Sep 1, 1972·Journal of Dental Research·D B Nuckles, C C Cosby
Nov 21, 2001·Journal of Agricultural and Food Chemistry·S JaggiA Shanker

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Citations

Feb 18, 2011·Critical Reviews in Food Science and Nutrition·R M González-RodríguezJ Simal-Gándara
Aug 29, 2014·Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment·A M Abd El-AtyJae-Han Shim
Oct 23, 2009·Bulletin of Environmental Contamination and Toxicology·Anil DuhanRachna Gulati
Nov 5, 2019·Ecotoxicology and Environmental Safety·Mengyun JiangWenwen Gong
Sep 14, 2020·The Science of the Total Environment·Hongxia LiXinzhong Zhang

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