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|Title:||Oligomeric proanthocyanidins from mangosteen pericarps||Authors:||Fu, C.
|Issue Date:||19-Sep-2007||Citation:||Fu, C., Loo, A.E.K., Chia, F.P.P., Huang, D. (2007-09-19). Oligomeric proanthocyanidins from mangosteen pericarps. Journal of Agricultural and Food Chemistry 55 (19) : 7689-7694. ScholarBank@NUS Repository. https://doi.org/10.1021/jf071166n||Abstract:||Oligomeric proanthocyanidins were extracted from mangosteen pericarps and fractionated by a Sephadex LH-20 column to give 0.66% yield (dry matter). 13C and 1H NMR signals showed the presence of predominantly procyanidins together with a few prodelphinidin units along with small amounts of stereoisomers of afzelechin/epiafzelechin, catechin/ epicatechin, and gallocatechin/ epigallocatechin. Depolymerization with benzylmercaptan resulted in epicatechin thioether as the major product, and the mean degree of polymerization was determined to be 6.6. The electron spray ionization-mass spectrometry and matrix-assisted laser desorption/ionization time-of-flight mass spectra revealed the dominant B type oligomers with mainly epicatechin units and with a small amount of A type oligomers. The isolated proanthocyanidins are potent peroxyl radical scavengers as evidenced by the high oxygen radical scavenging capacity at 1.7 × 104 μmol TE/g, much higher than that of pine bark and grape seed extracts. © 2007 American Chemical Society.||Source Title:||Journal of Agricultural and Food Chemistry||URI:||http://scholarbank.nus.edu.sg/handle/10635/94415||ISSN:||00218561||DOI:||10.1021/jf071166n|
|Appears in Collections:||Staff Publications|
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