STJEPAN PEPELJNJAK1* ZDENKA KALO\ERA2

Flavonoids are a group of natural compounds known to have various pharmacological properties such as antioxydative, antiinflammatory and diuretic (1). One of the well--known actions of flavonoids is antimicrobial activity. Pelargonium radula (Cav.) L’Hérit (Geraniaceae) is a plant rich in essential oil, which also contains flavonoids. While the antimicrobial activity of the whole extract of Pelargonium radula (2, 3) and isolated essen-tial oil (4) has been investigated in more detail, the flavonoid contribution to overall antimicrobial activity has remained unclear. In the present study we have investigated the antimicrobial activity of Pelargonium radula flavonoids against 22 microorganisms