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KMID : 0379119920200040302
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Korean Journal of Mycology
1992 Volume.20 No. 4 p.302 ~ p.308
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Fungal Flora and Mycotoxins Associated with Onion (Allium cepa L.) in Egypt
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Zohri, A. A.
Sabah, M. Saber/Gawad, K. M. Abdel
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Abstract
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Seven genera and 15 species of fungi were isolated from 50 samples of then different steps of dried onion (5 samples of each step) collected from an onion factory in Sohag Governorate, Egypt, and grown on glucose-Czapek´s agar (7 genera and 15 species) and 10% NaCl glucose-Czapek´s (2 genera and 6 species). The average total counts of fungi were gradually decreased throughout the different steps of drying from 2090 to zero and 152 to zero colonies/g on glucose-Czapek´s agar and 10% NaCl glucose-Czapek´s agar media, respectively. Aspergillus was the most common genus on the two types of media used. The dominant species were Aspergillus niger, A. flavus, A. terreus, Penicillium chrysogenum and Fusarium oxysporum on glucose-Czapek´s agar and A. terreus and A, niger on 10% NaCl glucose-Czapek´s agar. The chloroform extracts of different samples were tested for the presence of mycotoxins using thin layer chromatographic analysis. The results indicated that aflatoxin was present at concentrations decreased throughout the different steps of the drying from step No. 1, onion bulbs, 120 ㎍/㎏; to step No. 8, standard A, 20 ㎍/㎏ while step Nos. 9 & 10 (completely dry powdered onion) were free from aflatoxin. Citrinin was also present in the first three steps at concentrations gradually decreased from 30 to 10 ㎎/㎏.
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