Antifungal and antimycotoxigenic effect of Lactobacillus plantarum CRL 778 at different water activity values.

Autor: Dallagnol AM; Reference Centre for Lactobacilli (CERELA-CONICET), Chacabuco 145, San Miguel de Tucumán, Argentina., Bustos AY; Center of Research and Transfer of Santiago del Estero (CITSE - CONICET - UNSE), RN9, km 1125, Santiago del Estero, Argentina; Universidad de San Pablo-T. Tucumán, Argentina., Martos GI; Reference Centre for Lactobacilli (CERELA-CONICET), Chacabuco 145, San Miguel de Tucumán, Argentina. Electronic address: martos@cerela.org.ar., Valdez GF; Reference Centre for Lactobacilli (CERELA-CONICET), Chacabuco 145, San Miguel de Tucumán, Argentina., Gerez CL; Reference Centre for Lactobacilli (CERELA-CONICET), Chacabuco 145, San Miguel de Tucumán, Argentina.
Jazyk: angličtina
Zdroj: Revista Argentina de microbiologia [Rev Argent Microbiol] 2019 Apr - Jun; Vol. 51 (2), pp. 164-169. Date of Electronic Publication: 2018 Aug 23.
DOI: 10.1016/j.ram.2018.04.004
Abstrakt: Ochratoxin A (OTA) is a mycotoxin produced by filamentous fungi with high impact in food safety due to its toxicity. In the last decade, the presence of OTA was widely reported in different foods. In this study, the ability of Lactobacillus (L.) plantarum CRL 778 to control growth and OTA production by Aspergillus (A.) niger 13D strain, at different water activity (a w ) values (0.955, 0.964, 0.971, 0.982, and 0.995) was determined in vitro. Both parameters were significantly (p<0.05) reduced by the lactobacilli and the effect depended on a w . Greatest growth rate inhibition (46.9%) was obtained at a w =0.995, which is the most suitable value for growth and production of antifungal metabolites (lactic acid, acetic acid, phenyllactic and hydroxyl-phenyllactic acids) by L. plantarum CRL 778. Besides, morphological changes and inhibition of melanin synthesis were observed in colonies of A. niger 13D in presence of L. plantarum CRL 778 at a w ranged between 0.971 and 0.995. In addition, maximum reduction (90%) of OTA production took place at a w =0.971, while inhibition of fungi growth was more evident at a w =0.995. These findings suggest that L. plantarum CRL 778 could be used for control of ochratoxigenic fungal growth and OTA contamination in different fermented foods with a w values between 0.971 and 0.995.
(Copyright © 2018 Asociación Argentina de Microbiología. Publicado por Elsevier España, S.L.U. All rights reserved.)
Databáze: MEDLINE
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