Abstract
The column chromatographic separation of the MeOH extract from the aerial parts of Prunella vulgaris var. lilacina Nakai led to the isolation of fifteen triterpenoic acids (2-6, 9-13, 16-20), four flavonoids (14, 21-23), four phenolics (7, 8, 15, 24), and a diterpene (1). Their structures were determined by spectroscopic methods to be trans-phytol (1), oleanic acid (2) ursolic acid (3), 2alpha,3alpha,19alpha-trihydroxyurs-12en-28oic acid (4), 2alpha,3alpha-dihydroxyurs-12en-28oic acid (5), maslinic acid (6), caffeic acid (7), phydroxy cinnamic acid (8), 2alpha,3alpha,19alpha,23-tetrahydroxyurs-12en-28oic acid (9), 2alpha,3alpha,23-trihydroxyurs-12en-28oic acid (10), 2alpha,3beta-dihydroxyurs-12en-28oic acid (11), 2alpha,3beta,24-trihydroxyolea-12en-28oic acid (12), (12R, 13S)-2alpha,3alpha,24,trihydroxy-12,13-cyclo-taraxer-14-en-28oic acid (13), quercertin 3-O-beta-D-glucopyranoside (14), rosmarinic acid (15), 2alpha,3alpha,24-trihydroxyurs-12,20(30)-dien-28oic acid (16), 2alpha,3alpha,24-trihydroxyolea-12en-28oic acid (17), 2alpha,3beta,19alpha,24-tetrahydroxyurs-12en-28oic acid 28-O-Dglucopyranoside (18), 2alpha,3alpha,19alpha,24-tetrahydroxyurs-12en-28oic acid 28-O-D-glucopyranoside (19), prunvuloside A (20), kaempferol 3-O-alpha-L-rhamnopyranosyl(1-->6)-beta-D-glucopranoside (21), kaempferol 3-O-beta-D-glucopyranoside (22), quercertin 3-O-alpha-L-rhamnopyranosyl(1-->6)-beta-D-glucopyranoside (23), and 2-hydroxy-3-(3',4'-dihydroxyphenly)propanoic acid (24). Compounds 1, 8-12, 17, 21, 23, and 24 were isolated from this plant source for the first time. The isolated compounds were evaluated for their cytotoxicity against A549, SK-OV-3, SK-MEL-2, and HCT15 cells in vitro using the sulforhodamin B bioassay (SRB) method. Compound 3 exhibited moderate cytotoxic activity against A549, SK-OV-3, SK-MEL-2, and HCT15 cells, with ED(50) values of 3.71, 3.65, 13.62, and 5.44 microM, respectively.
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