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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

The glycosidic bond in a disaccharide is formed between the anomeric carbon of one sugar and a hydroxyl carbon of another, releasing a water molecule. In the nomenclature, the bond is named by specifying the anomeric configuration (α or β) of the first sugar and the carbon numbers involved. Thus, the name “α-1,4 glycosidic bond” indicates that the

A. First sugar is an aldose, and the second is a ketose
B. Anomeric carbon in the α-configuration of the first sugar is linked to the C4 of the second sugar
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C. Bond is in the fourth position of the ring
D. Sugar chain is four carbons long

📝 Explanation

The notation specifies the configuration (α) of the anomeric carbon (C-1) of the first sugar, and the carbon (C-4) of the second sugar to which it is linked. This precise nomenclature is essential for describing the specific, biologically active structure of an oligo- or polysaccharide.

📖 Additional Information

  • First sugar is an aldose, and the second is a ketose
  • Anomeric carbon in the α-configuration of the first sugar is linked to the C4 of the second sugar
  • Bond is in the fourth position of the ring
  • Sugar chain is four carbons long

The notation specifies the configuration (α) of the anomeric carbon (C-1) of the first sugar, and the carbon (C-4) of the second sugar to which it is linked. This precise nomenclature is essential for describing the specific, biologically active structure of an oligo- or polysaccharide.

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