Patent ID: 6960360

Claim:
A method of preparing a composition enriched in total phenols, comprising: a) extracting a plant material known to contain phenolic compounds with an extraction solvent without adding bisulfite ions to form a crude extract comprising proanthocyanidins, anthocyanins, and non-phenolic compounds; b) filtering said crude extract; c) contacting said filtered extract with a brominated polystyrene resin, wherein said resin releasably adsorbs said phenols but does not retain said non-phenolic compounds; d) washing said resin with a wash eluent to elute said non-phenolic compounds; e) eluting the resin with a first eluent and collecting a first fraction containing phenols; f) eluting the resin with a second eluent and collecting a second fraction containing phenols; and g) isolating the fraction from step e) or step f) or combining said fractions from steps e) and f) to obtain a composition enriched in total phenols, wherein said composition has depleted levels of said non-phenolic compounds.