Journal
FOOD CHEMISTRY
Volume 219, Issue -, Pages 399-407Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.09.170
Keywords
Separation; Proanthocyanidins; Grape seed; Degree of polymerization; HSCCC; Antioxidant activities
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Separation of plant proanthocyanidins remains a major challenge for scientists due to the structural diversity and complexity. In this work, a new and effective method was developed for preparative separation of grape seed proanthocyanidins (GSPs) according to degree of polymerization (DP) by high-speed counter-current chromatography (HSCCC). Under the optimized HSCCC conditions, GSPs could be separated into seven distinct fractions (F1-F7) with mean degree of polymerization in increasing order, from 1.44 to 6.95. High yields for these fractions (53.7, 12.2, 29.5, 30.2, 11.2, 50.8 and 169.8 mg, respectively) were achieved by only one-step HSCCC of 400 mg of GSPs. Further, seventeen individual proanthocyanidins, most of which are commercially not available, were efficiently isolated by re-chromatography on HSCCC or prep-HPLC; each of the isolated compounds presented high yields (7.1-78.9 mg) and high purity (70.0-95.7%). The positive correlation was observed between DP and antioxidant activity of proanthocyanidins. 2016 Elsevier Ltd. All rights reserved.
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