Different Degradation Patterns of Chiral Contaminant Enantiomers: Paclobutrazol as a Case Study

Studies often neglect the different trends between enantiomers in soil chiral contaminants. In present study, paclobutrazol was chosen as target analyte and selective degradation patterns of this pesticide were investigated soils. After 14 days culture, kinetics results demonstrated process two conforms to first‑order equation, rates significantly (paired t-test, P < 0.05). The rate (2S,3S)-paclobutrazol (S-paclobutrazol) higher than that (2R,3R)-paclobutrazol (R-paclobutrazol), with concentration decrease 42.6 28.7%, respectively. Meanwhile, enantiomer fraction (EF) 0.43 at final sampling point, half-life (t1/2) S-paclobutrazol R-paclobutrazol 17.3 28.9 days,which significant enantioselective degradation. Results from study served enhance our understanding about behaviors pesticides, which provided some scientific basis for potential risk assessment pesticides environment.