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Abstract
An investigation was carried out on Okinawan plants to find antibacterial compounds against a human skin bacterium, Staphylococcus epidermidis, which causes acne vulgaris. A medicinal plant, Elaeagnus glabra, showed significant activity, and (—)-epigallocatechin (27) was isolated from the plant as an antibacterial constituent against the bacterium. Twenty-six flavonoids related to 27 were tested for the activity, galangin (7) being the most active species. Although a structure-activity study was attempted, no clear structural factor was deduced.