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Enantioselective Biodegradation of the Pyrethroid Pesticide (±)-Lambda-Cyhalothrin by Environmental Bacteria

Grant number: 14/08558-3
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2014
Effective date (End): August 31, 2015
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Organic Chemistry
Principal Investigator:Andre Luiz Meleiro Porto
Grantee:Marylyn Setsuko Arai
Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil


Pesticides were developed with the purpose of controlling diseases and increase agricultural productivity. However, currently these compounds represent one of the greatest threats to the environment, because they are harmful to several organisms and also interfere on the basic processes of ecosystems. Residual elimination treatments of pesticides are being developed, especially bioremediation, which consist in the use of living organisms, such as bacteria, to reduce environmental contamination. This study aims to evaluate the (±) -lambda-cyhalothrin biodegradation potential of environmental bacteria, quantitatively analyzing its residual concentration and identifying its biodegradation pathway. Pyrethroids are derived from pyrethrins and even small concentrations may cause tremors, hypersensitivity, hyperexcitability, muscle cramps and seizures. It is expected that 3- phenoxybenzoic acid is one of the main metabolites formed during biodegradation. The identification of metabolites will be made by mass spectrometry and the quantification will be performed by chromatographic methods, moreover, the enantioselective biodegradation will be studied, evaluating which enantiomer is preferably biodegradable and determining the enantiomeric excess, since ( ± )-lambda cyhalothrin is a 1:1 mixture of two enantiomers.Keywords: 3-Phenoxybenzoic acid, Biodegradation, Lambda-cyhalothrin, bacteria, pyrethroid.

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
BIROLLI, WILLIAN G.; ARAI, MARYLYN S.; NITSCHKE, MARCIA; PORTO, ANDRE L. M. The pyrethroid (+/-)-lambda-cyhalothrin enantioselective biodegradation by a bacterial consortium. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY, v. 156, p. 129-137, MAY 2019. Web of Science Citations: 2.

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