title: Optimisation of nutritional requirements and process control parameters for the production of HA-2-91, a new tetraene polyene antibiotic.
abstract: HA-2-91, a new tetraene polyene antibiotic produced during submerged fermentation of Streptomyces arenae var ukrainiana. Optimisation of nutritional requirements and process control parameters were studied for higher productivity of HA-2-91 during fermentative production in shaken flasks using complex media. Experimental findings indicate that jowar starch (Sorghum vulgare) is the best carbon source while cornsteep liquor in combination with peanut meal are the best nitrogen sources. Exogenous addition of amino acids, divalent cations and fatty acids suppressed the productivity of HA-2-91. Incorporation of glucose into the production medium above 5% (w/v) results in inhibition of productivity of HA-2-91 which may be due to catabolite regulation. The concentration of phosphate ions above 10 ppm also showed similar suppression effect on the productivity of HA-2-91. However, ferrous ions at 100 ppm showed slight stimulatory effect on the production of HA-2-91. The optimum process control parameters for the production of HA-2-91 were found to be temperature, 28 degrees C; inoculum concentration from seed to production medium, 1% (v/v); pH and volume of production medium 6.5 and 100 ml respectively; and fermentation cycle time, 120 hours.
authors.affiliation: Laboratory of Industrial Microbiology and Fermentation, Research and Development Centre, Hindustan Antibiotics Ltd., Pimpri, Pune 411 018, India.
authors.forename: T E
authors.initials: TE
authors.lastname: Gupte
authors.forename: S R
authors.initials: SR
authors.lastname: Naik
mesh_terms: D000935:Antifungal Agents / Q000096:biosynthesis*; D002413:Cations, Divalent / Q000494:pharmacology; D003470:Culture Media; D005285:Fermentation; D005947:Glucose / Q000494:pharmacology; D009584:Nitrogen / Q000378:metabolism; D011090:Polyenes / Q000378:metabolism*; D013213:Starch / Q000378:metabolism; D013302:Streptomyces / Q000378:metabolism*
chemical_list: D000935:Antifungal Agents; D002413:Cations, Divalent; D003470:Culture Media; C514074:HA-2-91 compound; D011090:Polyenes; D013213:Starch; D005947:Glucose; D009584:Nitrogen