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REVISTA DE CHIMIE
Cite as: Rev. Chim.
https://doi.org/10.37358/Rev.Chim.1949

OSIM Nr. R102355
ISSN Online 2668-8212
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Revista de Chimie (Rev. Chim.), Year 2014, Volume 65, Issue 7,





Iuliana RAUT, Mariana CALIN, Mihaela Marilena LAZAROAIE, Anca ROSEANU, Mihaela BADEA-DONI, Florin OANCEA, Luiza JECU
Inhibition of Toxigenic Aspergillus niger by Microbial Metabolites

Abstract:

The aim of this study was to assess the potential of microbial antagonists to control the growth and mycotoxin production by toxigenic fungal strain Aspergillus niger. Mycotoxins are secondary metabolites that produce acute and chronic effects on human and animal health. Among the mycotoxins of great interest produced by Aspergillus are ochratoxins and aflatoxins. Ochratoxin is considered to be nephrotoxic, teratogenic, immunotoxic, and probable human carcinogen. From this group, ochratoxin A is found in wheat, corn, grapes, raisins, wines and wine vinegars, cheese and meat products of animals fed with contaminated grains. Six microbial strains, two Bacillus, one Trichoderma and three Pseudomonas were evaluated for their potential as biocontrol agents. The antifungal activity of extracellular compounds released by bacterial strains was investigated by dry matter determination, microscopic observations, and enzyme linked immunosorbent assay (ELISA). Out of tested strains, B. amyloliquefaciens 1014 cultures produces metabolites with higher antifungal activity against A.niger. The active extracellular metabolites were partial characterized as referring to thermal stability and their production was optimized by varying the composition of the culture medium. Our results revealed that the metabolites from B. amyloliquefacines 1014 are thermostable and they are able to conserve the antifungal activity after sterilization. Keywords : Aspergillus niger, Bacillus sp., biocontrol, metabolites, antifungal activity

Issue: 2014, Volume 65, Issue 7
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