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Published on: November 29, 2006
Sterigmatocystin: incidence, fate and production by Aspergillus versicolor in Ras cheese
E A Abd Alla1, M M Metwally, A M Mehriz
1Department of Dairying, Faculty of Agriculture, Cairo University, Dokki, Egypt.
Abstract:
The occurrence, distribution, and stability of sterigmatocystin (STG) in Ras cheese were investigated. An incidence value for STG in market samples of Ras cheese was 35% with a mean value of 22.2 micrograms/kg. In experimental Ras cheese from milk contaminated with STG, 80% of the toxin was retained in the curd while 20% was found in the whey. The temperature for cheese ripening affected the toxin content. At 6 degrees C the toxin concentration was hardly affected, but at 20 degrees C the concentration was reduced by 16% after 90 days. In Ras cheese contaminated with spores of Aspergillus versicolor, toxin production started after 45 days of the ripening, reached a maximum after 90 days, and declined thereafter. Cow's milk favoured toxin formation in comparison with buffalo's milk. Aged cheese (more than 6 months) inhibited toxin production.
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