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环境化学  2015 

DOI:10.7524/j.issn.0254-6108.2014.09.010

Keywords: 微囊藻毒素-LR,生物降解,细胞表面疏水性

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Abstract:

研究了从某人工湖底泥中筛选出的1株能够降解微囊藻毒素-LR(MC-LR)的菌株JM13的降解特性.实验结果表明,当加入50mg·L-1淀粉作为外加碳源时,菌株对初始浓度为0.5mg·L-1MC-LR的降解率可达44.5%;低浓度重金属Cu2+的加入可在一定程度上提高菌株对MC-LR的降解,降解率可达到44.8%;随着时间的延长,菌株对MC-LR的降解率不断增大,到第10天达到52.6%,当投入菌龄为36h的菌悬液时,降解率可达到55.4%.对该菌株细胞表面疏水性(CSH)的测试结果显示,在菌JM13细胞表面疏水性最大的情况下(即有机相水相=34时),添加淀粉及低浓度(0.5mg·L-1)Cu2+可以在一定程度上抵御降解过程中细菌表面疏水性的降低,使菌体细胞能更好地同污染物接触,从而在一定程度上提高菌株对MC-LR的降解.

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