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The pyrethroid (±)-lambda-cyhalothrin enantioselective biodegradation by a bacterial consortium.

Willian G Birolli1, Marylyn S Arai1, Marcia Nitschke2

  • 1Laboratório de Química Orgânica e Biocatálise, Instituto de Química de São Carlos, Universidade de São Paulo, Av. João Dagnone, 1100, 13563-120, Ed. Química Ambiental, J. Santa Angelina, São Carlos, São Paulo, Brazil.

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Summary
This summary is machine-generated.

Brazilian savannah bacteria can biodegrade the chiral pesticide (±)-lambda-cyhalothrin ((±)-LC), preferentially breaking down the more potent insecticidal isomer, gamma-cyhalothrin. This suggests a faster environmental degradation and reduced toxicity for crops.

Keywords:
Brazilian savannaCerradoEnantioselectivityInsecticideOrganic pollutantPesticide

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Area of Science:

  • Environmental Science
  • Microbiology
  • Biochemistry

Background:

  • Chiral pesticides like (±)-lambda-cyhalothrin ((±)-LC) are vital for crop protection.
  • Enantioselectivity in pesticide biodegradation remains under-researched.
  • Understanding biodegradation is crucial for assessing environmental impact.

Purpose of the Study:

  • To investigate the enantioselective biodegradation of (±)-LC by bacteria from the Brazilian savannah.
  • To identify biodegradation metabolites and propose a metabolic pathway.
  • To evaluate the potential of bacterial consortia for enhanced pesticide bioremediation.

Main Methods:

  • Cultivation of bacterial strains from Brazilian savannah.
  • Enantioselective biodegradation assays for (±)-LC.
  • Validated analytical methods for quantifying LC enantiomers and metabolites.
  • Identification of metabolites using advanced techniques.
  • Construction and testing of a bacterial consortium.

Main Results:

  • All bacterial strains demonstrated varying efficiencies in (±)-LC biodegradation (3.7-43.1%).
  • Significant enantiomeric excess (0-27% ee) was observed, indicating preferential degradation.
  • The more insecticidal isomer, gamma-cyhalothrin, was preferentially biodegraded.
  • A Bacillus consortium showed higher biodegradation efficiency than individual strains.
  • Thirteen metabolites were identified, leading to a proposed biodegradation pathway.

Conclusions:

  • Brazilian savannah bacteria possess the capability for enantioselective biodegradation of (±)-LC.
  • The preferential degradation of the active isomer (gamma-cyhalothrin) offers potential for reduced environmental toxicity.
  • Bacterial consortia represent a promising strategy for efficient pesticide bioremediation.
  • The identified metabolic pathway provides insights into the microbial degradation of pyrethroids.