Growth inhibition of bacillus subtilis and composition of various propolis extracts

The composition of 31 samples of propolis extract was investigated by using TLC. Ethanol extract of propolis (EEP) prepared from the various propolis samples differ mainly in quantities of identified compounds, and not in kind of components present. According to the inhibitory activity against Bacillus subtilis, the propolis samples were grouped in three categories. It appears that the galangin content in a sample is a main constituent, which determines its antibacterial activity.