دراسة قابلية بعض الفطريات الخيطية على إنتاج مضادات الأكسدة

الملخص EN

The ability of 92 isolates of filamentous fungi isolated from Aspergillus niger (24) , A.

terreus (15), A.

ochraceus (6) , Fusarium oxysporum (5) , Mucor sp.

(2), Penicillium oxalicum (5), Penicillium sp.

(12) and Rhizopus stolonifer (14).

The ability to produce aflatoxins were studied.

All strains of A.

flavus produced aflatoxins , while the other isolates gave negative results.

The ability of 83 (non- toxic isolates) were tested for antioxidants production, only 6 strains were selected for good capability to producing antioxidants which were A.

niger S1, F.

oxysporum S1, R.

stolonifer B3, A.

terreus S1, Mucor sp.

S1 and Penicillium sp.

A2.

It has been found that A.

niger S1 is the best antioxidants producer from rice koji extracted by ethyl acetate (EAERK).The optimum fermentation conditions for antioxidants production were studied for the selected fungal isolate A.

niger S1 and were recorded as follows:the optimum initial pH was 7,the optimum incubation temperature was 30 C,the optimum incubation period was 15 days.The best fermentation medium was rice.Ethyl acetate was the best solvent for antioxidants extraction from A.

niger S1 using rice koji.