FIELD: chemical industry, more particularly preparation of food chitosan. SUBSTANCE: method comprises alternating double treatment of shells of crustacean with 4% solutions of hydrochloric acid and sodium hydroxide, washing semifinished product after each stage to neutral reaction of wash water, treatment with 50% sodium hydroxide solution at 100 C for 30 minutes followed by washing to neutral reaction of medium and treatment with liquid nitrogen under airtight conditions for 2-4 minutes. EFFECT: improved quality of chitosan and shorter technological cycle. 5 ex, 1 tbl
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