The antimicrobial properties of propolis have been attributed
to its high flavonoid content and in particular the presence of
the flavonoids galangin and pinocembrin [12,25–27]. Huangchin
(Scutellaria baicalensis) is yet another example. This
herbal medicine has been used systemically and topically for
thousands of years in China for the treatment of periodontal
abscesses and infected oral wounds. The flavone baicalein is
reported to be largely responsible for this plant’s antimicrobial
effects [28].