FIELD: medicine, chemical-pharmaceutical industry. SUBSTANCE: invention relates to method of preparing pectin polysaccharides from plant raw material. Plant raw material is treated with formalin aqueous solution, kept in acidified water at pH 3.8-4.2 and 45-52 C to remove calcium and magnesium bridges followed by extraction of pectin polysaccharides with ammonium oxalate aqueous solution. Then extract is evaporated, treated with 96% ethyl alcohol and lyophilized. Fresh-water flower plants, for example, any species of duckweed genus (Lemna spp.) or preliminary milled fresh above ground part of higher plants containing pectin polysaccharides, for example, common campion Oberna behen (L.) Ikonn (Silene vulgaris, Moench Garke) are used as plant raw material. EFFECT: high yield and purification degree of product. 5 cl, 2 tbl, 4 ex
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