Why is sucrose not concidered a reducing sugar?

Expert Solution

Reducing property of sugars:

Monosaccharides like glucose, disaccharides like maltose reduces Fehling solution(i.e. Cu²⁺ to Cu⁺) and they themselve get oxidised to corresponding acid.

Reduction by sugar ( or we can say oxidation of sugar is possible only when linear form and cyclic form of of sugar exists in equilibrium.

Hence all monosaccharides are reducing agents as they exist in cyclic and linear form with equalibrium between.

But some disaccharides are non-reducing and some are reducing. The disaccharide in which anomeric carbon is involved in glycosidic bond formation can not exist in free linear form and hence they cannot get oxidized i.e. they cannot reduce Cu²⁺ to Cu⁺ .

Sucrose is disaccharide of glucose and fructose. Anomeric carbons of both glucose and fructose are innvolved in glycosidic bond formation and being having no free anomeric carbon they cant take linear form or non cyclic form.

Let us have an example of disaccharide which is reducing sugar

Maltose : Consist of 2 D-Glucose units joined together by glycosidic bond between C-1 (Anomeric C of 1 D-glucose) and C-4 (non anomeric C of anathor D-glucose). Its cleare that still 1 anomeric carbon is free to take linear form and hence Maltose is reducing sugar.

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queen_honey_blossom answered 2 years ago

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