The chemical name of sucrose is a-d-glucopyranosyl /?-d-fructofuranoside or y?-d-fructofuranosyl a-d-glucopyrano-side (4). In a sucrose molecule, the two monosaccharide units are linked reducing end to reducing end, that is, ano-meric carbon atom to anomeric carbon atom, by a glyco-sidic linkage. Because both the potential aldehydo group of the d-glucosyl unit and the potential keto group of the d-fructosyl unit are covalently bound in a mutual glyco-sidic bond, sucrose has no reducing end, as do essentially all other oligo- and polysaccharides (with few exceptions), so it is classified as a nonreducing carbohydrate.
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