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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

The formation of a glycosidic bond between a monosaccharide’s anomeric carbon and an alcohol group of another molecule (e.g., methanol) yields a glycoside. A glycoside is inherently non-reducing because

A. The glycosidic bond is in the β-configuration
B. The alcohol group prevents the ring from opening by locking the anomeric carbon in an acetal/ketal form
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C. The methanol molecule denatures the sugar
D. The reaction increases the molecular weight of the sugar, preventing reduction

📝 Explanation

The anomeric carbon in a glycoside is part of an acetal (or ketal) functional group, which is stable and cannot open to the free carbonyl form in a neutral/basic aqueous solution. Since no free carbonyl can form, the sugar cannot act as a reducing agent.

📖 Additional Information

  • The glycosidic bond is in the β-configuration
  • The alcohol group prevents the ring from opening by locking the anomeric carbon in an acetal/ketal form
  • The methanol molecule denatures the sugar
  • The reaction increases the molecular weight of the sugar, preventing reduction

The anomeric carbon in a glycoside is part of an acetal (or ketal) functional group, which is stable and cannot open to the free carbonyl form in a neutral/basic aqueous solution. Since no free carbonyl can form, the sugar cannot act as a reducing agent.

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