Authors: Bueno, Dante J.¹; Silva, Julio O.²; Oliver, Guillermo³; GonzáLez, Silvia N.⁴

Source: Journal of Food Protection®, Volume 69, Number 10, October 2006 , pp. 2544-2566(23)

Publisher: International Association for Food Protection

Abstract:

The effect of two species of lactobacilli, Lactobacillus casei CRL 431 and Lactobacillus rhamnosus CRL 1224, on growth of different Aspergillus flavus strains was determined. A. flavus strains (Ap, TR₂, or CF₈₀) were grown in LAPTg broth at 37°C for 7 days as a single culture and in association with L. casei CRL 431 or L. rhamnosus CRL 1224 at initial inoculum ratios of 1:1, 1:10, and 1:100. In most cases, the mixed cultures had a lower fungal growth and a lower pH than the control cultures. Mycelial dry weight was reduced to 73 and 85% using L. casei CRL 431 and L. rhamnosus CRL 1224, respectively. The pH decrease in mixed cultures when the fungal mycelial dry weight is reduced may play an important role in inhibition. The number of viable bacteria was variably affected by fungal growth. These results indicate that L. casei CRL 431 and L. rhamnosus CRL 1224 may be useful as potential biocontrol agent against A. flavus.

Document Type: Research article

Affiliations: 1: Centro de Referencia para Lactobacilos (CERELA)-CONICET, Chacabuco 145, 4000, Tucumán, Argentina; Instituto Nacional de Tecnología Agropecuaria (INTA), Estación Experimental Agropecuaria, Concepción del Uruguay, Casilla de Correo No. 6, 3260, Entre Ríos, Argentina 2: Cátedra de Micología, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, Tucumán, Argentina 3: Centro de Referencia para Lactobacilos (CERELA)-CONICET, Chacabuco 145, 4000, Tucumán, Argentina 4: Centro de Referencia para Lactobacilos (CERELA)-CONICET, Chacabuco 145, 4000, Tucumán, Argentina; Cátedra de Salud Pública, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, Tucumán, Argentina

Publication date: 2006-10-01

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