Process for extraction of polyphenolic compounds of catechin type from plants, the so obtained extract and its use

摘要

Process for extracting catechinic polyphenols, essentially oligomers, from potentilla species, comprises: a) the plant (whole or part) is treated with a polar organic solvent (pure or mixed with water); b) this extract is evaporated to dryness, at or below 60 degrees C; c) the residue is taken up in water and the oligomeric catechinic polyphenols extracted with a solvent immiscible with water; d) the solvent is evaporated to dryness at or below 60 degrees C. The extract obtained is claimed.