Characterization of a fungal strain capable of degrading chlorpyrifos and
its use in detoxification of the insecticide on vegetables |
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Authors: | Yun Long Yu Hua Fang Xiao Wang Xiao Mao Wu Min Shan Jing Quan Yu |
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Institution: | (1) Department of Plant Protection, College of Agriculture & Biotechnology, Zhejiang University, 310029 Hangzhou, Zhejiang, People’s Republic of China;(2) Department of Horticulture, College of Agriculture & Biotechnology, Zhejiang University, 310029 Hangzhou, Zhejiang, People’s Republic of China |
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Abstract: | A fungal strain capable of utilizing chlorpyrifos as sole carbon and energy sources was isolated from soil by enrichment cultivation approach. The half-lives of degradation (DT50) for chlorpyrifos at concentrations of 1, 10, and 100 mg l−1 by the fungal strain DSP in mineral salt medium were measured to be 2.03, 2.93, and 3.49 days, respectively. Two cell-free extracts E (1:10) and E (1:20)] from the fungal strain DSP in bran–glucose medium were prepared and used to enhance chlorpyrifos degradation on vegetables. Compared with the controls, the DT50 of chlorpyrifos were reduced by 70.3%, 65.6%, 80.6%, 80.6%, and 86.1%, and by 53.8%, 43.2%, 66.0%, 54.3%, and 67.7% on E (1:20) and E (1:10) treated pakchoi, water spinach, Malabar spinach, haricot beans, and pepper, respectively. The 7-day residual values (R
7) of chlorpyrifos on E (1:10) treated vegetables were all lower than the corresponding maximum residue levels of European Union (EU MRLs), except that the R
7 value on haricot beans was slightly higher than the corresponding EU MRLs. The results indicate that cell-free extracts could rapidly degrade chlorpyrifos residues on vegetables. |
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Keywords: | biodegradation cell-free extract chlorpyrifos microorganism residue vegetable |
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