平菇和榆黄蘑中吡唑醚菌酯残留动态研究

Degradation Kinetics of the Pyraclostrpbin Residue in Pleurotus ostreatus and Pleurotus citrinipileatus

利用液相色谱仪建立吡唑醚菌酯在平菇和榆黄蘑中残留分析方法,测定吡唑醚菌酯在平菇和榆黄蘑及培养料中的消解动态规律。结果表明:吡唑醚菌酯在平菇和榆黄蘑及培养料中的消解半衰期分别为2.8、2.9 d和14.1 d。培养料灭菌会减少吡唑醚菌酯的残留量。平菇和榆黄蘑及在含有吡唑醚菌酯的培养料中栽培90 d后,培养料中供试农药残留量0.68 mg/kg,在收获期同步采集的平菇和榆黄蘑子实体中均未检测到吡唑醚菌酯的残留量。因此,培养料中吡唑醚菌酯残留不会向平菇和榆黄蘑子实体转移,对食用菌产品质量安全的影响较小。

A high performance liquid chromatography（HPLC） method was developed for the determination of pyraclostrobin residues in Pleurotus ostreatus and Pleurotus citrinopileatus. The degradation kinetics of the pyraclostrobin in Pleurotus ostreatus, Pleurotus citrinopileatus and substrates was thus studied. The results indicated that the half-life period of pyraclostrobin in Pleurotus ostreatus, Pleurotus citrinopileatus and substrates were 2.8, 2.9 d and 14.1 d respectively. Sterilization remarkably reduced pyraclostrobin residues in the substrates. After Pleurotus ostreatus and Pleurotus citrinopileatus were cultivated for 90 days in the substrates with pyraclostrobin, with the tested pesticide residues in the substrates being 0.68 mg/kg, no residual volume was detected in the substance of Pleurotus ostreatus or Pleurotus citrinopileatus that were harvested at the same time. Therefore, pyraclostrobin residues in substrates didn＇t transfer to the fruiting bodies of Pleurotus ostreatus or Pleurotus citrinopileatus and thus had little impact on the quality safety of the edible fungus.