Abstract

SIMONI BERRA, Marco Angel et al. Resistance of Lactobacillus spp. to malathion 1000. Rev. Int. Contam. Ambient [online]. 2023, vol.39, 54183.  Epub June 05, 2023. ISSN 0188-4999.  https://doi.org/10.20937/rica.54183.

Malathion is one of the most widely used pesticides in Mexico and the world. Its indiscriminate use has placed it as the main pesticide detected in food products, causing health problems such as increased oxidative stress, insulin resistance, and alteration of lipid metabolism. Furthermore, the consumption of different species of Lactobacillus with probiotic capacity has been associated with other effects on health, including the reduction of alterations related to the consumption of pesticide residues. The objective of the present study was to determine the resistance of eight Lactobacillus species to different concentrations of malathion and evaluate which could be used to reduce the toxic effects of this pesticide on health. Eight Lactobacillus species present in food supplements were isolated and identified by polymerase chain reaction (PCR), and their resistance to the insecticide malathion 1000 at different concentrations was evaluated using the Kirby-Bauer technique. All Lactobacillus species considered, except L. salivarius, could grow in the presence of malathion at low doses (0.1, 1 %); however, resistance at medium doses (10, 20 %) varies between species, while at high doses (50, 83.6 %) there was no growth, or the number of colonies were was visibly lower compared to the control group. Considering the previous data, we can conclude that the resistance of Lactobacillus spp. at different concentrations of malathion varies according to the species, and seven of the eight species evaluated could present a potential beneficial effect when consuming food contaminated with malathion residues.

Keywords : pesticides; probiotics; gut microbiota; health.

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