啶虫脒和甲氨基阿维菌素苯甲酸盐在发育期杏果实中的残留动态与亚细胞分布关联分析

    Analysis of relationship between acetamiprid and emamectin benzoate residues digestion and subcellular distribution in apricot fruit growth stage

    • 摘要: 明确啶虫脒、甲氨基阿维菌素苯甲酸盐在发育期杏果中残留消解、亚细胞分布的变化及其关联性。在新疆杏果主产区选取6个试验点,分别按2000倍液喷施5%啶虫脒乳油、5000倍液喷施3%甲氨基阿维菌素苯甲酸盐微乳剂后采集不同发育期杏果样品,采用超高效液相色谱-串联质谱、差速离心法等方法,分析了杏果实及其细胞壁、细胞器、可溶性组分3种亚细胞组分中啶虫脒、甲氨基阿维菌素苯甲酸盐含量。结果表明:啶虫脒、甲氨基阿维菌素苯甲酸盐消解动态均符合一级动力学模型,半衰期分别为0.709~2.656 d和0.266~0.779 d;杏果实中啶虫脒残留水平与细胞壁、细胞器组分中啶虫脒残留水平呈显著正相关,相关系数分别为0.711、0.729;杏果实中甲氨基阿维菌素苯甲酸盐含量与细胞壁组分中甲氨基阿维菌素苯甲酸盐残留水平呈显著正相关,相关系数为0.520。由此可知:细胞壁、细胞器是影响啶虫脒在杏果中残留变化的主要组分,细胞壁是影响甲氨基阿维菌素苯甲酸盐在杏果中残留变化的主要组分。研究结果可为进一步探讨农药在杏果体内的代谢、吸收过程奠定理论基础。

       

      Abstract: To determine the residual digestion and subcellular distribution of acetamiprid and emamectin benzoate in apricot fruit during development and their correlation. Samples of apricot fruit at different development stages were collected from 6 experimental sites in Xinjiang Uygur Autonomous Region after spraying 5% acetamiprid emulsion with 2000 times liquid and 3% emamectin benzoate microemulsion with 5000 times liquid, respectively. The samples were collected by ultra-high performance liquid chromatography-tandem mass spectrometry and differential centrifugal method. The contents of acetamiprid and emamectin benzoate in apricot fruit and its cell wall, organelles and soluble components were analyzed, and the dynamic change of residue digestion of acetamiprid and emamectin benzoate in apricot fruit during the development period was discussed. The results showed that the digestion kinetics of acetamiprid and emamectin benzoate were consistent with the first-order kinetic model, and the half-lives were 0.709-2.656 d and 0.266-0.779 d, respectively. Among the 3 subcellular components, the residue level of acetamiprid in apricot fruit was significantly positively correlated with the residue level of acetamiprid in cell wall and organelle components, with the correlation coefficients 0.711 and 0.729, respectively. The content of emamectin benzoate in apricot fruit was significantly positively correlated with the residue level of emamectin benzoate in cell wall components, with the correlation coefficient 0.520. It can be concluded that cell wall and organelle components are the main components that affect the residual change of acetamiprid in apricot fruit, and cell wall components are the main components that affect the residual change of emamectin benzoate in apricot fruit. The results can lay a theoretical basis for further studies on the metabolism and absorption process of pesticides in apricot fruit.

       

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