Mycobiota of some medicinal plants and their toxigenic potential | Mykocenóza niektorých liečivých rastlín a ich toxický potenciál
2011
Grigoryan, K., Yerevan State University, Yerevan (Armenia), Biological Faculty, Laboratory of Food Control | Badalyan, G. | Sargsyan, M. | Harutyunyan, A. | Pogosyan, M.
70 samples of thyme and 30 samples of mint from Vayk region of Armenia were examined for the contamination by filamentous fungi and aflatoxins. 38 species of microfungi, which belong to 9 genus and two classes - Zygomycetes and Hyphomycetes, have been isolated and identified. High frequency of occurrence for the following species from genus Aspergillus: A. flavus, A. niger, A. nomius, A. fumigatus, A. foetidus is noticed. Most frequently P. aurantio-groseum, P. radulatum, P. brevi-compactum species from genus Penicillium has been isolated in thyme and mint samples. Ability of 68 strains from section Flavi, against biosynthesis of af latoxin B1 is studied, which have been isolated from thyme at different stages of processing and packing of medicinal tea. 17 strains, which belong to A. flavus, A. nomius, A. parasiticus, A. caleatus species, produced aflatoxin B, in range from 5 to 150 micro g per 100 ml. The majority of strains from the mentioned species did not lose viability at low water activity (aw=lt 0.400). In 19 samples of ready product from thyme, with high degree of contamination by species from section A. flavi, aflatoxins have not been found out.
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