FIELD: food industry, medicine. SUBSTANCE: raw is treated with formalin an aqueous solution to fix pigment followed by raw keeping in acidified water at pH 3.9-4.2 and temperature 48-51 C for 3-4 days. Then pectin polysaccharides are extracted with ammonium oxalate an aqueous solution at 68-70 C for 6-8 h, extract is filtered, concentrated on ultrafiltrating column with hole pores in combination with simultaneous dialysis and dried by lyophilic method. Freshly gathered plant fluorescences, for example, common tansy, Tanacetum vulgare L., containing pectin polysaccharides are used as raw source. EFFECT: improved method of preparing, increased yield of product. 3 cl, 1 tbl, 3 ex
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