Resumo

Solid state fermentation of Aspergillus parasiticus and aflatoxin production. Acta toxicol. argent. [online]. 2015, vol.23, n.2, pp.89-94. ISSN 1851-3743.

Aflatoxins are secondary metabolites of fungi with great carcinogenic potencial, mainly produced by Aspergillus flavus and Aspergillus parasiticus. In order of the wide variety of foods where mycotoxins are found in, this study aimed to determine growth conditions for Aspergillus parasiticus and production of four major aflatoxins (AFB1, AFB2, AFG1 and AFG2) considering different substrates known for contamination by these aflatoxins, including white rice, cathetus rice, peanuts, maize and whole wheat flour, and different pH and humidity values. When extracts of different substrates were analyzed by thin layer chromatography, it has been verified the production of aflatoxins in all foods; however, when high performance liquid chromatography (HPLC) analysis was performed, the greater production of aflatoxins was observed in cathetus rice and whole-wheat flour. Cathetus rice was then selected to continue the study and different solid medium with pH values between 3.5 and 7.5 and humidity percentages between 42 % and 62 % were prepared. When analyzed by HPLC, all samples showed production of aflatoxins, but the samples with higher humidity value (62%) showed greatest production while the pH changes had no effect on this production.

Palavras-chave : Aspergillus parasiticus; Aflatoxins; Solid state fermentation; Food.