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|Title:||Antioxidant activity and proanthocyanidin profile of selliguea feei rhizomes|
|Source:||Fu, C., Wang, H., Ng, W.L., Song, L., Huang, D. (2013-04). Antioxidant activity and proanthocyanidin profile of selliguea feei rhizomes. Molecules 18 (4) : 4282-4292. ScholarBank@NUS Repository. https://doi.org/10.3390/molecules18044282|
|Abstract:||Proanthocyanidins from the rhizomes of Selliguea feei (PSFs) were solvent-extracted and fractionated by Sephadex LH-20 column chromatography to give a 2.42% isolated yield (dry matter basis). 1H-NMR spectroscopy revealed the mean degree of polymerization (mDP) to be 2.6. 13C-NMR analysis showed typical signals for afzelechin/epiafzelechin units. Clear peaks at 76 ppm and 84 ppm indicated that both stereoisomers (afzelechin/ epiafzelechin) are present. In agreement with the NMR spectra, the ESI-MS spectrum indicated that PSFs are mainly monomers to trimers consisting of afzelechin/epiafzelechin units with A-type and B-type interflavanyl linkages. A trimer was purified and identified as demethylated selligueain B. Thiolysis confirmed the structure and the thiolytic products, methyl 2-[(2R, 3R, 4S)-3,5,7-trihydroxy-2-(4-hydroxyphenyl)chroman-4-yl]acetate (1) and 4β-(carboxymethyl)sulphanylepiafzelechin-(2β→O→7, 4β→8)-epiafzelechin methyl ester (2), were purified and characterized. Selligueain A, demethylated selligueain B, compounds 1 and 2 possess high antioxidant capacity at 1.18 × 104, 1.16 × 10 4, 0.95 × 104 and 1.29 × 104 μmol TE/g, respectively. © 2013 by the authors.|
|Appears in Collections:||Staff Publications|
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