BIODEGRADATION OF CYPERMETHRIN BY RHODOPSEUDOMONAS PALUSTRIS GJ-22 ISOLATED FROM ACTIVATED SLUDGE

文献类型： 外文期刊

第一作者： Zhang, Deyong

作者： Zhang, Deyong;Zhang, Songbai;Luo, Xiangwen;Yin, Lebin;Li, Xinghua;Liu, Yong;Zhang, Deyong;Yin, Lebin

作者机构：

关键词： photosynthetic bacteria;cypermethrin;rhodopseudomonas palustris;metabolic products

期刊名称：FRESENIUS ENVIRONMENTAL BULLETIN （ 影响因子：0.489； 五年影响因子：0.479 ）

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收录情况： SCI

摘要： GJ-22, a strain of the photosynthetic bacterium (PSB) capable of degrading cypermethrin (CPM), was isolated from the sludge from the wastewater treatment unit of an insecticide factory. The strain showed relatively high CPM degradation ability and was identified as Rhodopseudomo-nas palustris on the basis of its culture characteristics, colony and cell morphology, living cell absorption spectrum analysis, physiological and biochemical characteristics, type of internal photosynthetic membrane, and 16S rRNA sequence phylogenetic analysis. Single-factor tests showed that CPM degradation by GJ-22 was good from 25 ℃ to 35 ℃, but that the optimal temperature was 30 ℃; a pH of 7.0 was optimal for both initial growth and CPM degradation. GJ-22 completely transformed CPM at a concentration of 50 mg/L at 30℃, pH 7.0, and 7,500 lux within 7 days. Under optimal conditions, within a week, GJ-22 degraded 83.5% of CPM, 77.1% of fenpropathrin, 71.2% of bifenthrin, and 31.1% of ethofenprox at concentrations of 100 mg/L. The metabolic products were detected by performing gas chromatography/mass spectrometry (GC/MS) analysis; the analysis showed that GJ-22 oxidation or/and hydrolysis degraded CPM, yielding 5 metabolites.

分类号： X

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