Effect of acid lactic bacteria isolated from faeces of healthy dogs on growth parameters and aflatoxin B1 production by Aspergillus species in vitro.

Mycotoxin Res

Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta Nacional Nº 36 Km 601, Río Cuarto, Córdoba, Argentina.

Published: November 2011

AI Article Synopsis

  • The study investigated how lactic acid bacteria (LAB) from healthy dog feces impact the lag phase, growth rate, and aflatoxin B1 production by harmful Aspergillus fungi in lab settings.
  • E. faecium GJ40 was found to extend the lag phase of Aspergillus, while E. faecium MF5 significantly reduced the growth rate of A. parasiticus.
  • Most LAB isolates lowered aflatoxin B1 production, although a few strains did not show this effect.

Article Abstract

The aim of the present study was to evaluate the inhibitory effect of Enterococcus faecium and Lactococcus lactis subsp. lactis isolated from faeces of healthy dogs on (i) lag phase, (ii) growth rate, and (iii) aflatoxin B1 production by Aspergillus section Flavi on in vitro assays. Thirteen lactic acid bacteria (LAB) isolates were used as antagonist microorganisms. Antagonistic activity was assayed against four potentially aflatoxigenic Aspergillus section Flavi isolates: A. flavus (AF210 and AF281), A. parasiticus (AP245) and A. parasiticus (NRRL 2999). In general, the longest lag phases of Aspergillus isolates were obtained with E. faecium GJ40. Respecting the growth rate, no significant reduction was found in this parameter in the interaction assays with A. flavus and antagonist isolates respecting the control. While in A. parasiticus a significant reduction in growth rate was only observed in the interaction among reference strain and E. faecium MF5 isolate (p < 0.05). In general, AFB1 production was reduced by most of the LAB isolates assayed, except for E. faecium GJ18, GJ20, MF3 and MF4. This study provides the first data about the antiaflatoxigenic activity of autochthonous LAB isolated from dog faeces.

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Source
http://dx.doi.org/10.1007/s12550-011-0104-9DOI Listing

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