Xanthan

There is variable substitution of the polysaccharide. It is usually 60-70 % acetylated and 30-40 % with a ketal involving pyruvate.

Semisystematic Name:

(a) Unsubstituted

poly[4)-β-D-glucopyranosyl-(1→4)-3-O-{2-O-[4-O-(β-D-mannopyranosyl)-β-D-glucuronopyranosyl]-β-D-mannopyranosyl}-β-D-glucopyranosyl-(1→]

(b) Fully substituted

poly[4)-β-D-glucopyranosyl-(1→4)-3-O-{6-O-acetyl-2-O-[4-O-(3-O-acetyl-β-D-mannopyranosyl)-β-D-glucuronopyranosyl]-β-D-mannopyranosyl}-β-D-glucopyranosyl-(1→]

or

poly[4)-β-D-glucopyranosyl-(1→4)-3-O-(6-O-acetyl-2-O-{4-O-[4,6-di-O-(1-carboxyethan-1,1-diyl)-β-D-mannopyranosyl]-β-D-glucuronopyranosyl}-β-D-mannopyranosyl)-β-D-glucopyranosyl-(1→]

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