Abstract:
A process for producing rifamycin S and rifamycin SV by aerobically fermenting an aqueous nutrient medium with a strain of Micromonospora chalcea. The rifamycins are separated and recovered by reducing all the activity to rifamycin SV by treatment with ascorbic acid at the clarified fermentation broth stage or at one of the solvent stages of extraction and concentration. Rifamycin SV may be converted to rifamycin S by oxidation with activated manganese dioxide.
Abstract:
A new species of Micromonospora, designated Micromonospora lacustris sp. nov. Routien, when subjected to submerged aerobic fermentation under controlled conditions, produces a mixture of at least 13 antibiotics. Two of these antibiotics are rifamycin S and rifamycin SV. Two other members of the antibiotic mixture are the 3-thiomethyl derivatives of rifamycin S and rifamycin SV.
Abstract:
THE MITHRAMYCIN A IS USEFUL IN INHIBITING THE GROWTH OF TESTICULAR TUMORS IN MAN. THE MITHRAMYCIN A, B AND C ARE USEFUL IN INHIBITING THE GROWTH OF TRANSPLANTED TUMORS IN LOWER ANIMALS.