FIELD: medicine, chemical-pharmaceutical industry. SUBSTANCE: method involves extraction of brown algae with 96% ethyl alcohol at ratio raw and extractant = 1:2 followed by recrystallization from the boiling 96% ethanol, filtration at 50-70 C and purification in 0.1% hydrochloric acid solution at 80-90 C at ratio = 1:1. EFFECT: enhanced technological effectiveness of process.
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