Atividade antimicrobiana de plantas medicinais do cerrado mineiro frente a bactérias isoladas de ovinos com mastite

Abstract

Evalution of in vitro antimicrobial activity of barbatimão (Stryphnodendron adstringens), aroeira (Myracrodruon urundeuva) and carqueja (Baccharis thimera) extracts and oils of pequi nut (Caryocar brasiliensis), copaíba (Copaifera landesdorff) and rosemary pepper (Lippia origanoides), against bacteria isolated from sheep with mastitis from the Northern region of Minas Gerais state. Methodology: The antimicrobial activity of oils and extracts against strains of Staphylococcus spp. and Streptococcus spp. was determined using the broth macrodilution and disk diffusion technique. The microbicidal effect of the oils and extracts that showed antimicrobial activity in the previous tests was also determined. Results: The essential oil of copaiba, pequi nut oil, hydroalcoholic extract of the bark of the aroeira and decoction of the leaves of carqueja, were not efficient in inhibiting the growth of the bacteria used. The barbatimão extract presented bacteriostatic activity against bacteria isolated from sheep with mastitis and microbicidal effect of rosemary essential oil after 5 minutes of action. Conclusion: Stryphnodendron adstringens and Lippia origanoides presented antimicrobial activity on pathogens isolated from sheep milk with mastitis. Lippia origanoides oil also had a microbicidal effect on the bacteria in five minutes, promising in use as an alternative to the commonly used antibiotics.