"Estudo químico e atividades biológicas de extratos obtidos de culturas de Penicillium verrucosum Dierck" / Chemical study and biological activities of crude extracts obtained from different cultures of Penicillium verrucosum Dierck
Barbara Casellato Elias
DATA DE PUBLICAÇÃO
The absence of an effective treatment for Chagas disease and Leishmaniasis stimulates the search for new active compounds. The enzymes GAPDH from T. cruzi and APRT from L. tarentolae are attractive targets for rational search of antiprotozoal agents, taking part in essential pathways of the pathogens. Natural products are rich in structural diversity and biological activities. Penicillium is known to produce different groups of bioactive secondary metabolites, including antiprotozoal activity. In the trypanocidal screening of the 115 crude extracts from different cultures of P. verrucosum, the MeOH extracts from the mycelium and EtOAc extratcs from the culture broth were the most activity. These extracts were obtained from 24h in a preculture and for an additional 72h in Takeuchi medium. In the enzymatic assays, the highest inhibitory activity was 35%. Besides the differences observed in the biological activities, the extracts showed different chemical profiles in HPLC analysis. So, the production of secondary metabolites by P. verrucosum is dependent on the culture conditions. The chemical study of the selected extracts led to the isolation of fatty acids, triacylglycerols, mannitol, a,a-threalose, glycerylphosphocholine and one diketopyperazine alkaloid. This alkaloid has not previously been reported from Penicillium or other natural source.