FIELD: organic chemistry, polysaccharides.
SUBSTANCE: invention describes polysaccharide of the formula (I):
wherein n = 7-8; Araf means arabinofuranose; Galp means galactopyranose, and Rhap means rhamnopyranose and designated for its using as a medicinal agent in treatment of immunosuppressive diseases. Also, invention relates to a method for preparing this polysaccharide that involves gathering flowers of plant Calendula officinalis (pot-marigold), their treatment by extraction method involving cleansing flowers, milling flowers, treatment of milled flowers by laser radiation, suspending the prepared mixture in water, maceration of suspension and separating the prepared liquid. Then method involves treatment of prepared liquid by the isolating method including precipitation with methanol, centrifugation and chromatography separation under the bioanalysis control.
EFFECT: improved preparing method.
16 cl, 26 dwg, 2 tbl, 4 ex
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