FIELD: biotechnology. SUBSTANCE: invention relates to production of alginic acid and sodium alginate used widely in different branches of industry from brown algae, for example, sacchariferous laminaria (Laminaria cichoriocides) or Japanese laminaria (Laminaria japonica). Algoid raw is treated with acid and alkaline reagents, extracted alginates are purified, decolorized, alginic acid is isolated followed by preparing sodium alginate by neutralization. Solutions of anolyte and catholyte obtained by electric treatment of electrolyte Ц aqueous solution of alkaline metal salts, for example, sodium chloride in anode and cathode chambers of twin-chamber electrolyzer, respectively, are used as acid and alkaline chemical reagents. Invention allows to enhance efficiency and ecological safety of production of alginic acid and sodium alginate, to simplify technological processes and to improve its sanitary-hygienic conditions. EFFECT: improved method of production. 10 cl
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