Methanol extract of Juncus diastrophanthus (Juncaceae) was found to show potent antioxidant activity. Subsequent activity-guided fractionation of methanol extract of J. diastrophanthus led to the isolation of seven flavonoid compounds, isorhamnetin- (3), quercetin (4), quercetin-3-O-α-L-rhamnopyranoside, quercitrin (5), quercetin-3-O-β-D-xylopyranoside (6), and luteolin (7). These compounds were isolated for the first time from this plant. Compounds 4 and 7 showed significant antioxidative effects on 1,1-diphenyl-2-picrylhydrazyl, and compound 5 showed significant riboflavin-originated superoxide and xanthine-originated superoxide quenching activities.
Three compounds were isolated from the ethyl acetate soluble fraction of the methanolic extract of the leaves of Catalpa ovata (Bignoniaceae) through repeated column chromatography. We investigated the effects of these compounds on T cell-mediated responses for tumor surveillance and proliferation in U937, HL60, and Molt-4 leukemia cells. Compounds 1-3 inhibited proliferation of those cells in a dose-dependent manner. Compound 3 showed mild effect in Molt-4 cell cytotoxicity. Compound 3 enhanced gene expressions of p53 and IL-4, but decreased IL-2 and IFN-Gamma genes in Molt-4 cell. Our findings indicate that compound 3 may enhance T cell-mediated immune responses and anticancer properties.
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