title: Statistical approach to optimization of fermentative production of gellan gum from Sphingomonas paucimobilis ATCC 31461.
abstract: Gellan gum, a high-molecular-weight anionic linear polysaccharide produced by pure-culture fermentation from Sphingomonas paucimobilis ATCC 31461, has elicited industrial interest in recent years as a high-viscosity biogum, a suspending agent, a gelling agent, and an agar substitute in microbial media. In this paper we report on the optimization of gellan gum production using a statistical approach. In the first step, the one factor-at-a-time method was used to investigate the effect of medium constituents such as carbon and nitrogen sources; subsequently, the intuitive analysis based on statistical calculations carried out using the L16 -orthogonal array method. The design for the L16 -orthogonal array was developed and analyzed using MINITAB 13.30 software. All the fermentation runs were carried out at 30+/-2 degrees C on a rotary orbital shaker at 180 rpm for 48 h. In the second step, the effects of amino acids and gellan precursors such as uridine-5'-diphospate (UDP) and adenosine-5'-diphospate (ADP) on the fermentative production of gellan gum were studied. Media containing 4% soluble starch, 0.025% yeast extract, 1.0 mM ADP and 0.05% tryptophan gave a maximum yield of 43.6 g l(-1) starch-free gellan gum, which was significantly higher than reported values in the literature.
authors.affiliation: Food and Fermentation Technology Department, Institute of Chemical Technology, University of Mumbai, Matunga, Mumbai, India.
authors.forename: Ishwar B
authors.initials: IB
authors.lastname: Bajaj
authors.forename: Parag S
authors.initials: PS
authors.lastname: Saudagar
authors.forename: Rekha S
authors.initials: RS
authors.lastname: Singhal
authors.forename: Ashok
authors.initials: A
authors.lastname: Pandey
mesh_terms: D019149:Bioreactors / Q000382:microbiology; D003470:Culture Media; D007218:Industrial Microbiology / Q000379:methods; D011135:Polysaccharides, Bacterial / Q000096:biosynthesis*; D020578:Sphingomonas / Q000254:growth & development*
chemical_list: D003470:Culture Media; D011135:Polysaccharides, Bacterial; C048288:gellan gum