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Search for "ZOHRI A.A.": 2 articles found.
MARWA ABDEL-KAREEM M., ZOHRI A.A. (2017): Inhibition of three toxigenic fungal strains and their toxins production using selenium nanoparticles. [Se-NPs, mycotoxigenic moulds, mycotoxins, aflatoxins, ochratoxin A, sterigmatocystin] Czech Mycology 69(2): 193-204 (published: 24th November, 2017)
abstract
Spoilage and poisoning of foods by microfungi are a major problem, especially in developing countries. While selenium nanoparticles (Se-NPs) have been used for a wide range of applications including antibacterial, antioxidant and anticancer applications, the effects of Se-NPs on fungal strains remain for the most part unknown to date. Our research is a pioneering attempt to evaluate the antifungal activity and antimycotoxin properties of Se-NPs (32 nm). Se-NPs at different concentrations were evaluated against the growth and mycotoxins production of three toxigenic fungal strains. The growth of Aspergillus parasiticus, A. ochraceus and A. nidulans was completely inhibited using 7000, 9000 and 3000 μg/ml of Se-NPs, respectively, while the complete inhibition in aflatoxins, ochratoxin A and sterigmatocystin production was reported by addition of 2000, 2000, and 800 μg/ml of Se-NPs, respectively. Results of this study show that Se-NPs were effective against the fungal strains tested and their toxin production. These results suggest that Se-NPs could be used as an effective microfungicide in agricultural and food safety applications against toxigenic microfungi.
MOSTAFA M.E., ZOHRI A.A., KOTBY R.S. (2001): Lipid, sterol and ergosterol accumulation in isolates of dematiaceous Hyphomycetes. [Lipid, sterol, ergosterol, dematiaceous hyphomycetes] Czech Mycology 53(2): 149-159 (published: 20th February, 2002)
abstract
Mycelial dry weight, lipid and sterol contents of fungi tested varied with fungalgenus, species and even with isolate of one species. Their dry mass fluctuated between lll.6±l0.7-457.0±41.5 mg/50 ml medium. Lipids, sterols and ergosterol accumulated by the isolates tested ranged from 4.52±0.5-29.04±2.76%, 1.23±0.16-10.63±l.24% and 0.43±0.057-7.13±0.695% of their dry mass, respectively. Cochliobolus spicifer isolate No. 35 was the highest lipid-producer while Ulocladium atrum No. 90 proved to be superior in the production of sterols and ergosterol. TLC technique and chemical analysis of lipid classes produced by U. atrium No. 90 revealed that the lipid fractions are composed of free sterols, free fatty acids, sterol esters, glycolipids, phospholipids and squalene.
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