Antibacterial activity of Ethyl Acetate Extract of Agaricomycetes collected in Northeast Brazil

Abstract

Agaricomycetes produce bioactive substances with antibiotic, antiallergic, antiinflammatory, antioxidant, cytotoxic, antiatherogenic, hepatoprotective, hypoglycemic antiimmunoprotective properties. However, there have been few studies on material collected in Brazil. Thus, the current study aimed to improve the knowledge concerning the antibacterial potential of Agaricomycetes in the country by researching material collected in Northeast Brazil. Twenty one cultures deposited in Micoteca URM of UFPE and nine extracts from fresh basidiomata were tested. Extracts of the basidiomata and the cultures were obtained with ethyl acetate, which were solubilized at a concentration (1:10 v/v). The preliminary tests with the 30 samples (21 cultures and nine extracts of fresh basidiomata) were performed against eleven strains of Staphylococcus aureus, seven of which were resistant to oxacillin (ORSA), using block agar. Thirteen samples showed antibacterial activity, with inhibition between 9-24 mm and minimum inhibitory concentration (MIC) from 0.18-147 µg/mL, Fomitopsis cupreorosea (URM 6830), Ganoderma multiplicatum (URM 6975), G. parvulum (URM 2948), G. orbiforme (URM87741), Grammothele lineata (URM6827), Rigidoporus lineatus (URM 6828), R. microporus (URM 6878), Stereum ostrea (URM 6973, URM 87848) being the most significant.