FIELD: woodworking industry.
SUBSTANCE: invention relates to methods for recovering and purifying native bioflavonoids: dihydroquercitine and dihydrokaempferol from larch wood extracts. Method of recovering bioflavonoids from larch wood extracts is characterized by that freeze-dried extract is dissolved in ethylacetone/water mixture composed in specified proportion, specified amount of resulting solution is introduced into column filled with urea (sorbent) preliminarily equilibrated with ethylacetate, and column is then eluted with an ester and/or ketone having boiling point below 120°C, or with ethylacetate/acetone mixture at specified ratio. Eluate is collected and evaporated until crystallization is observed and then cooled. Separated crystals are rinsed and dried.
EFFECT: enabled single-step process for separating dihydroquercitine and dihydrokaempferol from resinous impurities and other polymeric compounds, reduced process expenses, and reduced environmental impact.
4 cl, 1 dwg
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