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[Influence of the interaction of temperature and water activity on the production of ochratoxin A and the growth of Aspergillus niger, Aspergillus carbonarius and Aspergillus ochraceus on coffee-based culture medium].
Abstract : In the present study, the effect of temperature and water activity on fungal growth and ochratoxin production on coffee-based medium was assessed. Optimal growth of three Aspergillus strains was observed in the same ecological conditions, namely 30 degrees C and 0.99 water activity. Maximal daily growth is 11.2, 6.92, and 7.22 mm/day for Aspergillus niger, Aspergillus carbonarius, and Aspergillus ochraceus, respectively. However, ecological conditions for optimal ochratoxin production vary according to the toxinogenic strain, with water activity as a limiting factor. Such an ochratoxin A production is inhibited at 42 degrees C and 0.75 water activity. Correspondence between laboratory tested water activity and that measured on a sun-dried ripe cherry batch shows that the first 5 days of drying are critical for fungal growth and ochratoxin A production. Accordingly, artificial drying of cherries at temperatures above 42 degrees C will impede not only fungal growth but also contamination with ochratoxin A.
https://hal-riip.archives-ouvertes.fr/pasteur-00761245 Contributor : Mireille DossoConnect in order to contact the contributor Submitted on : Wednesday, December 5, 2012 - 10:45:15 AM Last modification on : Monday, July 4, 2022 - 9:03:52 AM Long-term archiving on: : Saturday, December 17, 2016 - 8:30:13 PM
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Ahou Irène Kouadio, Ahmed Lebrihi, Georges N' Zi Agbo, Florence Mathieu, Annie Pfohl-Leszkowicz, et al.. [Influence of the interaction of temperature and water activity on the production of ochratoxin A and the growth of Aspergillus niger, Aspergillus carbonarius and Aspergillus ochraceus on coffee-based culture medium].. Canadian Journal of Microbiology, NRC Research Press, 2007, 53 (7), pp.852-9. ⟨10.1139/W06-143⟩. ⟨pasteur-00761245⟩