[Distribution of oleandomycin between the native broth and butylacetate depending on the biosynthesis conditions]. / Izuchenie raspredeleniia oleandomitsina mezhdu nativnym rastvorom i butilatsetatom v zavisimosti ot uslovii biosinteza.

Distribution of the active substance contained in the fermentation broth of Act. antibioticus between the acqueous phase and butylacetate depended on the fermentation conditions and the procedure for the fermentation broth treatment before filtration. Increase in pH values during the fermentation process resulted in lower antibiotic distribution coefficients which may be explained by the presence of oleandomycin-X, a biologically active substance in the fermentation broth filtrates. This substance differed from oleandomycin and did not pass into butylacetate from the acqueous alkaline solution. For transference of oleandomycin-X into oleandomycin exposition of the fermentation broth filtrate at pH 5.0--5.5 is required.

[Rifamycin in B distribution between aqueous and organic phases]. / K voprosu o raspredelenii rifamitsina B mezhdu vodnoi i organicheskoi fazoi.

Dependence of the coefficient of rifamycin B distribution in the system of butyl acetate-buffer solution on pH of the equilibrium acqueous phase, antibiotic concentration in the solution and temperature was studied. It was shown that the coefficient value did not depend on the antibiotic concentration within 1000-2000 gamma/ml and temperature.