Isolation of a series of antibiotics produced by a new variety of Streptomyces viridochromogenes was attempted, and three main components were obtained as amorphouspowders. They were primarily active against Grampositive bacteria, anaerobic bacteria and mycoplasmaand characterized as new members of sulfur-containing peptidic antibiotics. The antibiotic complex was named sulfomycin.
Isolation, purification and physicochemical properties of the antibiotic complex YA-56, a family of phleomycin-bleomycin group, are described. The antibiotic YA-56 complex was found to be composed mainly of two active components named YA-56X and Y. These components were clearly differentiated from the reported phleomycins and bleomycins by their physicochemical properties. However, by direct comparison, YA-56 X was found to be identical with zorbamycin reported recently. YA-56Y was recognized to be a new antibiotic.
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