Patent ID: 8372445

Claim:
A process for the extraction of Vitis vinifera seeds consisting of the steps of: a) extraction of grape seeds with a C1-C3 alcohol, mixtures thereof or aqueous solutions thereof with a water content not higher than 90% (v/v) to form an extract; b) removal of water-insoluble tannins by cooling the extract of step a) and filtering and centrifuging off the insolubles; c) removal of water-soluble tannins by adding polyvinylpolypyrrolidone (PVPP) to the extract of step b); and d) separation of products in the extract of step c) having different molecular weights, through repeated chromatographic purification on a column to obtain products with predetermined contents of monomers of catechin and epicatechin and predetermined contents of proanthocyanidole oligomers and procyanindins.