The method has been developed for accounting viable bifidobacteria in the complex preparation biphicol using the growth inhibitor of Escherichia coli (0.01% solution of sodium azide), added to the growing medium. Choice of sodium azide concentration inhibiting growth of Escherichia coli M-17 and not affecting the growth of Bifidobacterium bifidum 1 is described in detail. Data are presented on the quality of commercial preparation made at different enterprises.
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