Avaliação da atividade anti-séptica de extrato seco de Stryphnodendron adstringens (Mart.) Coville e de preparação cosmética contendo este extrato

The species of the genus Stryphnodendron are known as "barbatimao" and are native from Brazilian "cerrado". They present tannins as main secondary metabolites of their barks and show antimicrobial and cicatrisation activity among others. The minimum bactericidal concentration (MBC) of the dry extract from the barks of Stryphnodendron adstringens against two Gram-positive and one Gram-negative bacteria was done using methodology of broth dilution in tubes. The antimicrobial activity of the dry extract and the antiseptic activity of the liquid soap containing that dry extract were evaluated by agar difusion method. For the extract were obtained the minimum bactericidal concentration values of 50 mg/mL against Staphylococcus aureus and 75 mg/mL against Staphylococcus epidermidis and Escherichia coli and by agar difusion, S. aureus showed more sensibility to the dry extract than the other bacteria. The liquid soap showed efficiency in the antiseptic activity against the bacteria studied at the concentration of 100 mg of extract/mL of soap.