Different Enantioselective Degradation of Pyraclofos in Soils
详细信息 查看全文
- 作者：Yuxin Xu ; Hu Zhang ; Shulin Zhuang ; Man Yu ; Hua Xiao ; Mingrong Qian
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2012
- 出版时间：May 2, 2012
- 年：2012
- 卷：60
- 期：17
- 页码：4173-4178
- 全文大小：297K
- 年卷期：v.60,no.17(May 2, 2012)
- ISSN：1520-5118
文摘
This study investigated the enantioselective degradation behavior of pyraclofos in three soils (NC, HZ, and ZZ) under native and sterilized conditions. The absolute configuration of pyraclofos enantiomers has been determined by the combination of experimental and calculated electronic circular dichroism spectra. S-(+)- and R-(鈭?-Pyraclofos were separated and determined on a cellulose tri-(4-chloro-3-methylphenylcarbamate) (Lux Cellulose-4) chiral column by reversed-phase high-performance liquid chromatography鈥搕andem mass spectrometry. Pyraclofos enantiomers were configurationally stable in three soils and no interconversion was observed during the incubation of enantiopure S-(+)- or R-(鈭?-pyraclofos under native conditions. The enantioselective degradation behavior of chiral pyraclofos was dramatically different in three soils under native conditions, with half-lives (t1/2) of pyraclofos in NC, HZ, and ZZ soils of 2.6, 13.4, and 7.8 days for S-(+)-pyraclofos and 9.2, 9.3, and 8.2 days for R-(鈭?-pyraclofos. Compared to the half-lives (t1/2) of rac-pyraclofos of 21.5, 55.9, and 14.4 days in sterilized NC, HZ and ZZ soils, the degradation velocity was greatly improved in native soils, indicating that degradation was greatly attributed to microbially mediated processes in agricultural cultivating soils.