title: Improvement in production and quality of gellan gum by Sphingomonas paucimobilis under high dissolved oxygen tension levels.
abstract: The effect of agitation rate and dissolved oxygen tension (DOT) on growth and gellan production by Sphingomonas paucimobilis was studied. Higher cell growth of 5.4 g l(-1) was obtained at 700 rpm but maximum gellan (15 g l(-1)) was produced at 500 rpm. DOT levels above 20% had no effect on cell growth but gellan yield was increased to 23 g l(-1 )with increase in DOT level to 100%. Higher DOT levels improved the viscosity and molecular weight of the polymer with change in acetate and glycerate content of the polymer.
authors.affiliation: School of Biochemical Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221 005, India.
authors.forename: R M
authors.initials: RM
authors.lastname: Banik
authors.forename: A
authors.initials: A
authors.lastname: Santhiagu
mesh_terms: D010100:Oxygen / Q000494:pharmacology*; D011135:Polysaccharides, Bacterial / Q000096:biosynthesis*; D020578:Sphingomonas / Q000254:growth & development / Q000378:metabolism*
chemical_list: D011135:Polysaccharides, Bacterial; C048288:gellan gum; D010100:Oxygen