| 摘要 |
PURPOSE:To easily obtain the titled substance useful as antioxidant, raw material for pharmaceuticals, etc., from a proanthocyanidin-containing liquid in high yield, by using a PS resin as an adsorbent resin and eluting the adsorbed component with a polar solvent at a specific temperature. CONSTITUTION:A liquid containing proanthocyanidin [e.g. a 2-10-mer containing the nit of formula (R1 is H or OH; R2-R4 are H, OH, methoxy, etc.; R5 is H, galloyl or glycopyranosyl) as a constituent unit] which is obtained generally by the extraction of various vegetables with an aqueous medium is adsorbed to a PS resin. The resin is washed with a polar solvent at <=50 deg.C (usually at 0-50 deg.C) and then the adsorbed component is eluted with a polar solvent at >=60 deg.C (preferably at 80-150 deg.C) to obtain the objective proanthocyanidin. The polar solvent used in the above processes is preferably water or a mixture of water and 20% ethanol, methanol, propanol, etc.
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