FIELD: chemical and pharmaceutical industry. SUBSTANCE: the DNA sodium salt is dissolved in a 0.1-0.9% aqueous NaCl solution, while continuously stirred for 1-24 hours at a temperature of 4-60 C, the resulting solution is allowed to pass through a system of filters having a pore diameter of 5-0.2 micron and the desired pro duct is recovered at a concentration of 0.2-3% . EFFECT: higher efficiency.
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