Patent ID: 6479081
Filing Date: 2002-11-12
Classification: C07C,C07D

Abstract:
A method for producing a grape marc and/or seed tannin comprising:(a) carrying out, starting with fresh black and/or white grape marc and/or seed, a solid-liquid extraction of a crude tannin fracfion in sulphited water (H2O+SO2); (b) removing at least part of the aqueous solvent from the resulting extract in order to obtain a concentrate of the crude tannin fraction; (c) obtaining a concentrate of the fermented crude tannin fraction by inoculating yeasts into the concentrate of the crude tannin fraction; (d) purifying the crude tannin fraction in order to obtain the tannin by selective adsorption of the polyphenolic compounds of the concentrate onto a resin, elution of the polyphenolic compounds from the resin and subsequent filtration.