Abstract
From the leaves of Brassica juncea, three kaempferol glycosides, kaempferol-3-O-(2-O-sinapoyl)-β-d-glucopyranosyl-(1→2)-β-d-glucopyranoside-7-O-β-d-glucopyranoside (1), kaempferol-3-O-β-d-glucopyranosyl-(1→2)-β-d-glucopyranoside-7-O-β-d-glucopyranosyl-(1→6)-β-d-glucopyranoside (2), and kaempferol-3-O-(2-O-sinapoyl)-β-d-glucopyranosyl-(1→2)-β-d-glucopyranoside-7-O-β-d-glucopyranosyl-(1→6)-β-d-glucopyranoside (3) were isolated and the structures elucidated on the basis of spectral and chemical evidences. Antioxidant activities were determined by measuring the scavenging activities on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical and peroxynitrite (ONOO−). Compounds 1 and 3 showed good antioxidant activities with respective IC50 values of 28.61 and 36.93 µM toward DPPH; respective IC50 values of 9.79 and 11.40 µM toward ONOO−. However, compound 2 showed no DPPH scavenging activity and weak ONOO− scavenging activity with an IC50 value of 32.00 µM.
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Jung, H.A., Woo, J.J., Jung, M.J. et al. Kaempferol glycosides with antioxidant activity from Brassica juncea . Arch. Pharm. Res. 32, 1379–1384 (2009). https://doi.org/10.1007/s12272-009-2006-3
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DOI: https://doi.org/10.1007/s12272-009-2006-3