Zooglans with altered sugar composition were synthesized by Zoogloea ramigera by varying the glucose concentration and initial medium pH. The relative mol % of the sugar components, glucose and galactose, in the exopolymer made with 2% (w/v) glucose as the carbon source was 66 and 34%, respectively. By varying the glucose concentration and initial medium pH, the mol % ratios of glucose to galactose in zooglan ranged from 70 : 30 to 58 : 42. Also, glucose analogs, 3-O-methyl-D-glucose, 2-amino-2-deoxy-D-glucose, and 2-acetamido-2-deoxy-D-glucose, were used as a cc-substrate with glucose to produce modified zooglans. The mol % ratios of glucose to galactose in exopolymers produced by co-feeding glucose analogs ranged from 70 : 30 to 9 : 91.