The results of studying the effectiveness of incorporation of the label from different 14C- and 3H-precursors into the molecule of rifamicin B during its biosynthesis are presented. The regularities of the label incorporation into the antibiotic composition as dependent on the time of the precursor addition were investigated. A radiochemically pure preparation of 14C-rifamicin B with specific radioactivity of 3 mcurie/mg was obtained.
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