Xanthan gum
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Xanthan gum is a bacterial polysaccharide produced by a process involving fermentation of glucose by the Xanthomonas campestris bacterium. Xanthan gum chain consists of repeating modules of five sugar units. The backbone of the polysaccharide chain consists of two β-D-glucose units linked through the 1 and 4 positions. And the side chain consists of two mannose and one glucuronic acid. The side chain is linked to every other glucose of the backbone at the 3 position. About half of the terminal mannose units have a pyruvic acid group linked as a ketal to its 4 and 6 positions. The other mannose unit has an acetyl group at the 6 positions.
CHEMICAL STRUCTURE OF XANTHAN:
Xanthan gum is a polysaccharide used as a food additive and rheology modifier.
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