 |
 |
Journal articles
[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.
Cited literature [28 references]
https://hal-riip.archives-ouvertes.fr/pasteur-00761245
Contributor : Mireille Dosso <>
Submitted on : Wednesday, December 5, 2012 - 10:45:15 AM
Last modification on : Friday, February 5, 2021 - 12:30:03 PM
Long-term archiving on: : Saturday, December 17, 2016 - 8:30:13 PM
Contributor : Mireille Dosso <>
Submitted on : Wednesday, December 5, 2012 - 10:45:15 AM
Last modification on : Friday, February 5, 2021 - 12:30:03 PM
Long-term archiving on: : Saturday, December 17, 2016 - 8:30:13 PM