title: Determination of optimum conditions for antibiotic production by Streptomyces galbus.
abstract: The nutritional requirements and cultural conditions for optimal production of a new extracellular antifungal antibiotic by Streptomyces galbus under laboratory conditions were determined. Glycerol and glucose were found to be the best carbon sources, while as N-source nitrate was preferred. Maximum titre was reached after 7 d of incubation at 30 degrees C at pH 6.8 The metal ions Cu2+, Zn2+, and Fe2+ had some promoting effect. Casein hydrolysate improved production, but yeast extract markedly inhibited. Growth in shake flasks favoured higher yield of the antibiotic in a shorter time.
mesh_terms: D000935:Antifungal Agents / Q000096:biosynthesis*; D050260:Carbohydrate Metabolism; D003470:Culture Media; D006863:Hydrogen-Ion Concentration; D009584:Nitrogen / Q000378:metabolism; D013302:Streptomyces / Q000254:growth & development / Q000378:metabolism*; D013696:Temperature; D014131:Trace Elements / Q000494:pharmacology
chemical_list: D000935:Antifungal Agents; D003470:Culture Media; D014131:Trace Elements; D009584:Nitrogen