Heteropolysaccharide S-657
AssigneeMerck & Co., Inc.
InventorsJerry A. Peik, Suzanna M. Steenbergen, George T. Veeder
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Abstract
The new heteropolysaccharide S-657, prepared by fermentation of a new strain of Xanthomonas campestris, ATCC 53159, has valuable properties as a thickening, suspending and stabilizing agent in aqueous solutions and is especially valuable for use in well treating fluids. Heteropolysaccharide S-657 is composed principally of carbohydrate, about 12% protein and about 7% (calculated as O-acetyl) acyl groups, the carbohydrate portion containing about 19% glucuronic acid, and the neutral sugars rhamnose and glucose in the approximate molar ratio of 2:1.
Claims2
Heteropolysaccharide S-657, consisting essentially of carbohydrate, substantially no pyruvate, about 12% protein and about 7% acyl groups calculated as O-acetyl, the carbohydrate portion containing about 19% glucuronic acid, and the neutral sugars rhamnose and glucose in the approximate molar ratio of 2:1 wherein the heteropolysaccharide S-657 is produced by a biologically pure culture of Xanthomonas campestris ATCC 53159 in an aqueous nutrient medium by aerobic fermentation of an assimilable carbon source at a pH greater than 6.0 and a temperature of 25.degree.-35.degree. C.
Dependencies are inferred from the claim text.