Composition and Rheological Properties of Extracellular Polysaccharide 105-4 Produced by Pseudomonas sp. Strain ATCC 53923.

A soil isolate produced a novel extracellular polysaccharide (EPS) with unusually potent thickening powers. The EPS contained d-mannose, d-glucose, d-galactose, and d-glucuronic acid in the unique molar ratio 1:4:1:2 and 10 to 15% acetate. Viscosities of a 1-g/liter aqueous solution were 1 x 10 and 14 x 10 cP at shear rates of 0.01 and 0.1 s, respectively. The EPS was insensitive to high concentrations of NaCl and CaCl(2).