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利用降解酶去除蔬菜表面农药毒死蜱残留

Keywords: 毒死蜱,残留,降解酶,蔬菜表面

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Abstract:

利用毒死蜱降解菌WZ-Ⅰ能高效降解毒死蜱的特性,研究了消除蔬菜表面毒死蜱残留污染的途径。用自来水、浓度为0.5%的洗涤剂、不同浓度的粗酶液及浓度为0.5%小苏打(NaHCO3),处理受农药毒死蜱污染的甘蓝和黄瓜。结果表明,使用一定浓度的降解酶液能有效去除蔬菜表面的农药残留污染,在10min内最高去除率可达60.2%。不同浓度的酶液对蔬菜表面上的毒死蜱残留去除具有较大的影响,随着酶液浓度的增加,对农药的去除效果逐渐增加。采用酶液优化浓度的选择试验,结果表明浓度为0.5%和5.0%的粗酶液在10min对甘蓝表面的毒死蜱的去除率分别为49.8%和55.2%,对黄瓜表面的毒死蜱的去除率分别为30.8%和54.2%,据此确定去除甘蓝和黄瓜表面的农药残留的最佳酶液浓度分别为0.5%和5.0%。在所选用的4种处理方法中,使用粗酶液对蔬菜表面的毒死蜱残留的去除效果最好。

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