FIELD: biotechnology, microbiology. SUBSTANCE: method involves the selection of optimal conditions of flotation. Electroflotation is carried out at voltage 10-60 volt, current density 100-300 A/m for 10-45 min, at pH 3-11 and temperature 18-50 C. The process is carried out in the presence of flocculant taken among the group including PAA-335, K-11, K-22, K-29, PAS and PVS. The method ensures to accelerate and enhance the yield of biological concentrate without alternation of its biological activity. Invention can be used in preparing biologically active substances used in production of drug and medicinal preparations. EFFECT: improved method of preparing. 6 ex
