Enantioselective biodegradation of the pyrethroid (±)-lambda-cyhalothrin by marine-derived fungi. (April 2018)

• Record Type: Journal Article
• Authors: Birolli, Willian G.; Vacondio, Bruna; Alvarenga, Natália; Seleghim, Mirna H.R.; Porto, André L.M.
• Is Part Of: Chemosphere. Volume 197(2018)
• Page Start: 651
• Page End: 660
• Publication Date: 2018-04
• Subjects: Marine fungi -- Pesticides -- Bioremediation -- Insecticide -- Organic pollutant -- Enantioselectivity; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2018.01.054
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The contamination of agricultural lands by pesticides is a serious environmental issue. Consequently, the development of bioremediation methods for different active ingredients, such as pyrethroids, is essential. In this study, the enantioselective biodegradation of (±)-lambda-cyhalothrin ((±)-LC) by marine-derived fungi was studied. Experiments were performed with different fungi strains ( Aspergillus sp. CBMAI 1829, Acremonium sp. CBMAI 1676, Microsphaeropsis sp. CBMAI 1675 and Westerdykella sp. CBMAI 1679) in 3% malt liquid medium with 100 mg L −1 of (±)-LC. All strains biodegraded this insecticide and the residual concentrations of (±)-LC (79.2–55.2 mg L −1, i.e., 20.8–44.8% biodegradation), their enantiomeric excesses (2–42% ee ) and the 3-phenoxybenzoic acid (PBAc) concentrations (0.0–4.1 mg L −1 ) were determined. In experiments for 28 days of biodegradation in the absence and presence of artificial seawater (ASW) with the most efficient strain Aspergillus sp. CBMAI 1829, increasing concentrations of PBAc with (0.0–4.8 mg L −1 ) and without ASW (0.0–15.3 mg L −1 ) were observed. In addition, a partial biodegradation pathway was proposed. All the evaluated strains biodegraded preferentially the (1 R, 3 R, α S )-gamma-cyhalothrin enantiomer. Therefore, marine-derived fungi enantioselectively biodegraded (±)-LC and can be applied in future studies for bioremediation of contaminated areas. This enantioselective biodegradation indicates that the employment of the most active enantiomer GC as insecticide not only enable the use of a lower amount of pesticide, but also a more easily biodegradable product, reducing the possibility of environmental contamination. Graphical abstract: Image 1 Highlights: Marine-derived fungi biodegraded both isomers of the pyrethroid Lambda-cyhalothrin. The most active enantiomer sold as gamma-cyhalothrin was preferentially biodegraded. Degradation of the most active enantiomer reduces the death of non-target species. A biodegradation pathway including 8 metabolites was proposed. Marine-derived fungi should be studied for bioremediation methods.