Effect of pH on ochratoxin A production by A. niger aggregate species
Résumé
The effect of pH (2-10) on growth and ochratoxin A (OTA) production by twelve Aspergillus niger aggregate strains was studied in two culture media: Czapek Yeast Autolysate agar (CYA) and Yeast Extract Sucrose agar (YES), during a period of 30 days. The strains were selected to include different sources, different reported abilities to produce OTA and different ITS-5.8S rDNA RFLP patterns. YES showed to be better culture medium than CYA for OTA production. In this medium, OTA was produced from pH 2 or pH 3 to pH 10 depending on the strain. Our results show the ability of A. niger aggregate strains not only to grow but also to produce OTA over a wide pH range. These results will lead to a better understanding of the role of A. niger aggregate strains in the OTA contamination of several food commodities.
Origine : Fichiers produits par l'(les) auteur(s)
Loading...