【摘 要】
：
The free enzyme extracted from WZ-I,which was identified as Fusarium LK.ex Fx,could effectively degrade chlorpyrifos,an organophosphate insecticide.The methods
【机 构】
：
College of Resources and Environment
【基金项目】
：
国家自然科学基金;the Postdoctoral Science Foundation of China
论文部分内容阅读
The free enzyme extracted from WZ-I,which was identified as Fusarium LK.ex Fx,could effectively degrade chlorpyrifos,an organophosphate insecticide.The methods of immobilizing this free enzyme and determined its degradation-related characteristics were investigated.The properties of the immobilized enzyme were compared with those of the free enzyme.The optimal immobilization of the enzyme was achieved in a solution of 30 g/L sodium alginate at 4℃ for 4-12 hr.The immobilized enzyme showed the maximal activity at pH 8.0,45℃.The maximum initial rate and the substrate concentration of the immobilized enzyme were less than that of the free enzyme.The immobilized enzyme,therefore,had a higher capacity to withstand a broader range of temperatures and pH conditions than the free enzyme.With varying pH and temperatures,the immobilized enzyme was more active than the free enzyme in the degradation reaction.In addition,the immobilized enzyme exhibited only a slight loss in its initial activity,even after three repeated uses.The results showed that the immobilized enzyme was more resistant to different environmental conditions,suggesting that it was viable for future practical use.
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