Phenylpropanoids from red kohlrabi sprouts inhibits nitric oxide production in RAW 264.7 macrophage cells

Abstract

The sprouts of red kohlrabi (Brassica oleracea var. gongylodes) were extracted with methanol, and the concentrated extracts were successively partitioned with ethyl acetate, n-butyl alcohol (n-BuOH), and H2O. From the n-BuOH fraction, four phenylpropanoids were isolated through repeated silica gel and ODS column chromatographies. On the basis of physico-chemical and spectroscopic data including NMR, MS, and IR, the isolated compounds were identified as 3-(3,4,5-trimethoxyphenyl)-2E-propenoic acid methyl ester (1), (E)-sinapic acid methyl ester (2), (E)-sinapoyl glucoside (3), and lawsoniaside B (4). Moreover, the compounds dose-dependently inhibited NO production in RAW 264.7 cells with IC50 values of 41.22 (1), 38.32 (3), and 22.65 (4) μM, respectively. With further studies, these compounds may be potentially useful in developing new anti-inflammatory agents. © 2014 The Korean Society of Food Science and Technology and Springer Science+Business Media Dordrecht.