| 手性异丙甲草胺在土壤中的选择性降解 |
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| 作者姓名： | MA Yun LIU Wei-Ping WEN Yue-Zhong |
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| 作者单位： | [1]Institute of Environmental Science, Zhejiang University, P. O. Box 31 74, Hangzhou 310029 （China） [2]Researeh Center of Green Chirality, College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310015 （China） |
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| 基金项目： | 国家自然科学基金;国家自然科学基金 |
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| 摘 要： | Separation of chiral enantiomers and the dissipation of rac-metolachlor and S-metolachlor in soil were evaluated using achiral high-performance liquid chromatography （HPLC） and chiral gas chromatography （GC） methods. Under the experimental conditions the possible metabolite was considered to be N-（2-ethyl-6-methyl-phenyl）-2-hydroxy-acetamide. Because of the presence of two chiral elements （asymmetrically substituted carbon and chiral axis）, the baseline separation of metolachlor enantiomers was not achieved. S-metolachlor degraded faster in soil than rac-metolachlor. After a 42-day incubation, 73.4% of rac-metolachlor and 90.0% of S-metolachlor were degraded. However, due to the absence of biological processes the degradation process in sterilized soil showed no enantioselectivity. The results indicated that enantioselective degradations could greatly affect the environmental fate of metolachlor and should be considered when the environmental behavior of these compounds was assessed.
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| 关 键 词： | 手性分离 降解作用 土壤化学 土壤反应 |
| 收稿时间： | 2005-10-29 |
| 修稿时间： | 2006-04-13 |
Enantioselective degradation of rac-metolachlor and S-metolachlor in soil |
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| MA Yun,LIU Wei-Ping,WEN Yue-Zhong.Enantioselective degradation of rac-metolachlor and S-metolachlor in soil[J].Pedosphere,2006,16(4):489-494. |
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| Authors: | MA Yun LIU Wei-Ping and WEN Yue-Zhong |
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| Institution: | Institute of Environmental Science, Zhejiang University, P. O. Box 3174, Hangzhou 310029,China. |
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| Abstract: | Separation of chiral enantiomers and the dissipation of rac-metolachlor and S-metolachlor in soil were evaluated using achiral high-performance liquid chromatography (HPLC) and chiral gas chromatography (GC) methods. Under the experimental conditions the possible metabolite was considered to be N-(2-ethyl-6-methyl-phenyl)-2-hydroxy-acetamide. Because of the presence of two chiral elements (asymmetrically substituted carbon and chiral axis), the baseline separation of metolachlor enantiomers was not achieved. S-metolachlor degraded faster in soil than rac-metolachlor. After a 42-day incubation, 73.4% of rac-metolachlor and 90.0% of S-metolachlor were degraded. However, due to the absence of biological processes the degradation process in sterilized soil showed no enantioselectivity. The results indicated that enantioselective degradations could greatly affect the environmental fate of metolachlor and should be considered when the environmental behavior of these compounds was assessed. |
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| Keywords: | chiral separation degradation rac-metolachlor S-metolachlor soil |
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