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Biodegradation of ochratoxin A by Aspergillus section Nigri species isolated from French grapes:a potential means of ochratoxin A decontamination in grape juices and musts

Bejaoui, Hend and Mathieu, Florence and Taillandier, Patricia and Lebrihi, Ahmed Biodegradation of ochratoxin A by Aspergillus section Nigri species isolated from French grapes:a potential means of ochratoxin A decontamination in grape juices and musts. (2006) FEMS Microbiology Letters, vol. 255 (n° 2). pp. 203-208. ISSN 0378-1097

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Official URL: http://dx.doi.org/10.1111/j.1574-6968.2005.00073.x

Abstract

Ochratoxin A (OTA) is a very dangerous mycotoxin, the presence of which is often reported in different foods, as well as in beverages such as grapes, grape juices and wines. Detoxifying these products is therefore of prime importance in protecting consumer health, and biological approaches have been the most promising methods. In this report, 40 isolates representing the black apergilli species Aspergillus carbonarius, A. niger aggregate and A. japonicus, isolated on French grapes, were assessed for OTA degradation capacities in CZAPEK yeast extract broth (CYB) and in a synthetic grape juice medium (SGM) contaminated with OTA at 2 mg L1 (5 mM). It was clearly observed that in both media these fungi had the ability to degrade OTA to OTa (ochratoxina). However, there were differences between the media used and species tested during OTA degradation. In SGM and CYB, 77% and 45% of the isolates, respectively were able to degrade more than 80% of the OTA. Despite a better growth on SGM, specific OTA degradation was higher on CYB for most of the isolates. Kinetic studies carried out on SGM with three black Aspergillus isolates all showed different OTA degradation rates. After 9 days of incubation, OTa had decreased, whereas an unknown compound appeared. A. niger could be the first interesting species for OTA detoxification processes, followed by A. japonicus.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Bioprocédés et systèmes microbiens (BioSyM)
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Deposited By: Hélène Dubernard

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