Dietary risk evaluation of tetraconazole and bifenazate residues in fresh strawberry from protected field in North China

Publication date: Available online 19 April 2019Source: Regulatory Toxicology and PharmacologyAuthor(s): Liu Shifeng, Kou Hongru, Mu Baofeng, Wang Jinzhong Zhang ZhiyongAbstractResidues and dietary risk assessment of tetraconazole and bifenazate were investigated in strawberry under greenhouse conditions using high performance liquid chromatography (HPLC-DAD) after QuEChERs extraction in Beijing of China. The effects of different processing factors on the two pesticides were studied. The recoveries of tetraconazole and bifenazate were 87.0% and 89.1%, respectively. The dissipation curves of tetraconazole and bifenazate were in accordance with the first-order kinetic equation and the half-life were 5.92 d and 5.58 d, respectively. When the pre-harvest interval (PHI) was 3 d, the risk quotient (RQs) of both pesticides was less than 100%. Although soaking was a poor way to remove the two pesticides and heating at high temperatures increases the concentration of both pesticides, the residues of two pesticides can be effectively removed by washing after soaking. The results of dietary intake assessment indicated that potential dietary risk caused by tetraconazole and bifenazate in strawberry were acceptable for Chinese consumers.
Source: Regulatory Toxicology and Pharmacology - Category: Toxicology Source Type: research