In disaccharides, if the reducing groups of monosaccharides, i.e., aldehydic or ketonic groups are bonded, these are non-reducing sugars. Which of the following disaccharide is a non-reducing sugar?
1.
2.
3.
4.
HINT: Reducing sugars are sugars where the anomeric carbon has an OH group attached that can reduce other compounds. Non-reducing sugars do not have an OH group attached to the anomeric carbon so they cannot reduce other compounds.
This structure represents sucrose in which -D glucose and -D-fructose is attached to each other by glycosidic linkage.
Since reducing groups of glucose and fructose are involved in glycosidic bond formation, this is considered as a non-reducing sugar.
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