Enantioselective biodegradation of the pyrethroid (±)-lambda-cyhalothrin by marine-derived fungi.

摘要: Abstract The contamination of agricultural lands by pesticides is a serious environmental issue. Consequently, the development bioremediation methods for different active ingredients, such as pyrethroids, essential. In this study, enantioselective biodegradation (±)-lambda-cyhalothrin ((±)-LC) marine-derived fungi was studied. Experiments were performed with strains (Aspergillus sp. CBMAI 1829, Acremonium 1676, Microsphaeropsis 1675 and Westerdykella 1679) in 3% malt liquid medium 100 mg L−1 (±)-LC. All biodegraded insecticide residual concentrations (±)-LC (79.2–55.2 mg L−1, i.e., 20.8–44.8% biodegradation), their enantiomeric excesses (2–42% ee) 3-phenoxybenzoic acid (PBAc) (0.0–4.1 mg L−1) determined. experiments 28 days absence presence artificial seawater (ASW) most efficient strain Aspergillus increasing PBAc (0.0–4.8 mg L−1) without ASW (0.0–15.3 mg L−1) observed. addition, partial pathway proposed. evaluated preferentially (1R,3R,αS)-gamma-cyhalothrin enantiomer. Therefore, enantioselectively can be applied future studies contaminated areas. This indicates that employment enantiomer GC not only enable use lower amount pesticide, but also more easily biodegradable product, reducing possibility contamination.