Food-associated lactic acid bacteria with antimicrobial potential from traditional Mexican foods

Alvarado C; BE García Almendárez; SE Martin; Regalado C

2006, Number 3-4

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Microbiología 2006; 48 (3-4)

Food-associated lactic acid bacteria with antimicrobial potential from traditional Mexican foods

Alvarado C, García ABE, Martin SE, Regalado C

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Language: English
References: 35
Page: 260-268
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ABSTRACT

This work was conducted to identify indigenous LAB capable of antimicrobial activity, present in traditional Mexican-foods with potential as natural preservatives. A total of 27 artisan unlabeled Mexican products were evaluated, from which 94 LAB strains were isolated, and only 25 strains showed antimicrobial activity against at least one pathogen indicator microorganism. Most of the inhibitory activity showed by the isolated LAB strains was attributed to pH reduction by organic acids. Lactobacillus and Lactococcus strains were good acid producers, depending on the substrate, and may enhance the safety of food products. Cell free cultures of Leuconostoc mesenteroides CH210, and PT8 (from chorizo and pulque, respectively) reduced the number of viable cells of enteropathogenic E. coli in broth system. Lb. plantarum CC10 (from “madre” of vinegar) showed significant inhibitory effect against S. aureus 8943. E. faecium QPI1 (from panela cheese) produced a bacteriocin with wide anti-L. monocytogenes activity. Selected LAB from traditional Mexican foods showed good potential as bio-preservatives.

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