Antibacterial activities of fruits extracts of three mulberry species (Morus alba L., Morus rubra L. and Morus nigra L.) and bilberry (Vaccinium myrtillus L.)

Delphinidin is a dominant anthocyanidin in bilberry. Antimicrobial activity of methanol extracts of the genus Morus showed that M. nigra L. extract was more active than extracts of other two species (M. alba L. and M. rubra L.). Minimal inhibitory and bactericidal concentration of V. myrtillus methanol extract was in the range of MIC/MBC = 15.75-252.00 mg/mL. Antimicrobial effect of the tested extracts was less potent against strains from wounds compared to ATCC strains as well Gram (-) bacteria compared to Gram (+) bacteria. The most sensitive strains were S. epidermidis, S. pyogenes. P. mirabilis and S. aureus.