METHOD OF LARCH BARK TANNIC EXTRACT PREPARING Russian patent published in 1999 - IPC

FIELD: pharmacy. SUBSTANCE: method involves short-time activation of bark by temperature and pressure followed by extraction with an aqueous-spirituous solution. Before an activation larch bark is extracted preliminary with nonpolar solvent and an activation is carried out in the presence of ammonium chloride taken at amount 0.5-1% of an absolutely dry bark mass. EFFECT: increased yield of tannic substances, improved quality, simplified technology of process. 2 ex, 3 tbl