บทคัดย่องานวิจัย

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Fungal flora and mycotoxins associated with onion (Allium cepa L.) in Egypt.

Zohri, A. A.; Saber, S. M.; Abdel-Gawad, K. M.;

Korean Journal of Mycology Year: 1992 Vol: 20 Issue: 4 Pages: 302-308 Ref: 49 ref.

1992

บทคัดย่อ

Fungal flora and mycotoxins associated with onion (Allium cepa L.) in Egypt.

Fungi (15 species in 7 genera) were isolated from 50 onion samples taken at different stages during drying in a factory in Sohag Governorate. The av. total counts of fungi decreased throughout the 10 stages of drying from 2090 to 0 colonies/g on glucose-Czapek agar and from 152 to 0 on 10% NaCl glucose-Czapek. Aspergillus was the most common genus on both media. The dominant species were A. niger, A. flavus, A. terreus, Penicillium chrysogenum and Fusarium oxysporum on glucose-Czapek and A. terreus and A. niger on NaCl glucose-Czapek. Chloroform extracts of different samples were analysed for mycotoxins. Aflatoxins were present from stage 1 (onion bulbs, at 120 micro g/kg) to 8 (standard A dried onion, 20 micro g) but absent from 9 and 10 (completely dry powdered onion). Citrinin was also present in the first 3 steps.