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《Acta Scientiae Circumstantiae》 2008-01
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A feasibility study on the degradation of tetracycline by ligninolytic enzymes

JIA Yannan,WEN Xianghua,LI JiaxiState Key Laboratory of Environmental Simulation & Pollution Control,Department of Environmental Science and Engineering,Tsinghua University,Beijing 100084  
During the recent decade,the PPCPs in water environment are becoming an emergent environmental issue that attracts more attention.Many reports showed that the common-used PPCPs in daily life had been detected in various samples from aqueous environment,among which antibiotics were more frequently detected than others.Tetracycline(TC)was regarded as the research objective in this study because of their wide application,high-solubility in water,high residual toxicity and characteristic of non-biodegradation.The strong capabilities of both crude manganese peroxidase(MnP)and crude lignin peroxidase(LiP)were figured out to degrade tetracycline in vitro.Upon this,three different enzyme activities(15 U·L-1,40 U·L-1,70 U·L-1)were investigated under selected reaction conditions.The results illustrated that LiP had a stronger degrading ability than MnP towards TC.When the enzyme activity was 40 U·L-1 and the TC concentration was 50 mg·L-1,the degradation percentage by LiP could reach about 95% in five minutes while it could just reach 70% in two hours by MnP.The degradation percentage was enhanced by about 15% when the enzyme activity was increased from 15 U·L-1 to 40 U·L-1 for LiP.However,it did not change much when the enzyme activity was increased to 70 U·L-1.While with the increasing MnP activity,the degradation rate of TC increased distinctively.In addition,H2O2 additional supply during the reaction process could obviously improve the degradation of TC by MnP.
【Fund】: 国家自然科学基金项目(No.20677033)~~
【CateGory Index】: X172
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