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Enantioselective separation and degradation of the herbicide dichlorprop methyl in sediment
Author(s) -
Ma Yun,
Xu Chao,
Wen Yuezhong,
Liu Weiping
Publication year - 2009
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.20624
Subject(s) - chemistry , enantiomer , enantioselective synthesis , chirality (physics) , high performance liquid chromatography , degradation (telecommunications) , chromatography , pesticide , chiral column chromatography , gas chromatography , organic chemistry , catalysis , computer science , telecommunications , chiral symmetry breaking , physics , quantum mechanics , nambu–jona lasinio model , agronomy , biology , quark
Chiral pesticides currently constitute about 50% of all pesticides dosage used in China, and this ratio is increasing as more complex structures are introduced. Dichlorprop methyl (DCPPM) is a chiral herbicide consisting of a pair of enantiomers. In this study, the enantiomeric separation of DCPPM was investigated by gas chromatography (GC) and high‐performance liquid chromatography (HPLC) using chiral stationary phases (CSPs), and its enantiomeric degradation was characterized using a DCPPM‐degrading bacterial strain isolated from an activated sludge from a textile‐printing wastewater treatment plant. Baseline separation by both GC and HPLC was achieved. Incubation with DCPPM‐degrading bacteria in different pH solutions showed that the R enantiomer was preferentially degraded over the S enantiomer of DCPPM. The degradation rate constant decreased with increasing pH in the order of k pH5 ≈ k pH7 > k pH9 . In comparison, the enantioselectivity as indicated by EF followed the order of pH 7 > pH 9–pH 5. Chirality, 2009. © 2008 Wiley‐Liss, Inc.