Bian Yanli, Wang Boning, Liu Fengmao, Wang Yihan, Huang Hongwei
Shandong Academy of Pesticide Sciences Institute of Residue Technology, Shandong Academy of Agricultural Sciences, Jinan, China.
College of Science, China Agricultural University, Beijing, China.
J Sci Food Agric. 2021 Nov;101(14):6020-6026. doi: 10.1002/jsfa.11257. Epub 2021 Apr 27.
The stability of pesticide residues in stored samples is very important to ensure the quality of data about the residues. The evaluation of pesticide residues in food and environment samples is an important means to ensure food quality and protect consumers against potential dietary risks. Improper storage of pesticide residue samples may result in loss of pesticide and unreliable data, which could affect safety assessments.
The influences of storage conditions, including temperature (-20 °C, 4 °C, and ambient temperature) and sample state (homogenized state and coarsely chopped state) on the storage stability of dichlorvos, malathion, and diazinon on cowpea were studied. Dichlorvos and malathion were more stable in an homogenized state than in a coarsely chopped state. At 4 °C, the residual dichlorvos in the coarsely chopped state and the homogenized state, respectively, was 12% and 69%; the residual malathion was 26% and 92%, respectively. Dichlorvos suffered a large loss of 89% and 59% for coarsely chopped and homogenized cowpea, even at -20 °C. It was obvious that the stability of dichlorvos and malathion were more affected by storage state than diazinon. The stability of diazinon was significantly affected by temperature. The effect of storage state and temperature on stability is likely to be correlated with enzymes in the matrix, such as superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD).
The optimal stable storage conditions for three organophosphorus insecticides residues on cowpea were in the homogenized state and under a lower temperature. © 2021 Society of Chemical Industry.
储存样品中农药残留的稳定性对于确保残留数据的质量非常重要。食品和环境样品中农药残留的评估是确保食品质量和保护消费者免受潜在饮食风险的重要手段。农药残留样品储存不当可能导致农药损失和数据不可靠，从而影响安全性评估。
研究了储存条件（包括温度（-20°C、4°C和环境温度）和样品状态（匀浆状态和粗切状态））对豇豆中敌敌畏、马拉硫磷和二嗪农储存稳定性的影响。敌敌畏和马拉硫磷在匀浆状态下比在粗切状态下更稳定。在4°C时，粗切状态和匀浆状态下残留的敌敌畏分别为12%和69%；残留的马拉硫磷分别为26%和92%。即使在-20°C下，粗切和匀浆豇豆中的敌敌畏损失也分别高达89%和59%。显然，敌敌畏和马拉硫磷的稳定性比二嗪农更容易受到储存状态的影响。二嗪农的稳定性受温度影响显著。储存状态和温度对稳定性的影响可能与基质中的酶有关，如超氧化物歧化酶（SOD）、过氧化氢酶（CAT）和过氧化物酶（POD）。
豇豆中三种有机磷杀虫剂残留的最佳稳定储存条件是匀浆状态和较低温度。©2021化学工业协会。
