Comparative Study of the Selective Degradations of Two Enantiomers in the Racemate and an Enriched Concentration of Indoxacarb in Soils
Comparative Study of the Selective Degradations of Two Enantiomers in the Racemate and an Enriched Concentration of Indoxacarb in Soils
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土壤中茚虫威外消旋体和富集浓度中两种对映体选择性降解的比较研究
DOI：
10.1021/jf5018803
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发表时间：
2014
影响因子：
6.1
通讯作者：
Song Bao-An
中科院分区：
文献类型：
--
作者：
Zhang Yu-Ping;Hu De-Yu;Ling Hu-Rong;Zhong Lei;Huang An-Xiang;Zhang Kan-Kan;Song Bao-An
本研究考察了茚虫威的两种对映体（2.33S/1R）和外消旋体（1S/1R）的选择性降解。用x射线衍射法测定了茚虫威对映体的绝对构型。结果表明，在两种碱性土壤中，这些-(+)-吲哚威在浓缩物和消旋物中均优先降解。在一种酸性土壤中，这两种对映体无选择性降解。在另一种酸性土壤和一种中性土壤中，theR-(−)-吲哚威在浓缩物和外消旋物中均优先降解。茚虫威对映体在5种土壤中构型稳定，培养过程中未发生相互转化。由于灭菌后样品的降解没有显著差异，观察到的对映体选择性可能主要归因于土壤中的微生物活动。结果表明，两种配方的选择性降解行为相同。
In this study, selective degradations of the two enantiomers of indoxacarb in the concentrate (2.33S/1R) and racemate (1S/1R) are examined. The absolute configurations of indoxacarb enantiomers were determined using X-ray diffraction. The results showed that in two alkaline soils, theS-(+)-indoxacarb was preferentially degraded in both the concentrate and racemate. In one acid soil, the two enantiomers degraded no-selectivity. In another acid soil and one neutral soil, theR-(−)-indoxacarb was preferentially degraded in both the concentrate and racemate. Indoxacarb enantiomers were configurationally stable in the five soils, and no interconversion was observed during the incubation. Because no significant difference in degradation was observed after samples were sterilized, the observed enantioselectivity may be attributed primarily to microbial activity in soils. The results indicate that the selective degradation behavior was the same for both formulations that were tested.