Abstract
Antibiotic 6640 is produced by aerobic submerged fermentation of a new species of organism, Micromonospora inyoensis (NRRL 3292). The antibiotic is produced substantially as a single component and is extracted from the broth by a cationic exchange procedure. It is purified by use of an anionic resin. Chromatographic studies indicate that it most nearly resembles, but is different from gentamicin C1a. This report describes the production, isolation, , purification, and chemical and physical properties of antibiotic 6640.
