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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

The glucose residue in a polysaccharide chain that is capable of acting as a reducing agent is specifically the one that possesses a

A. Free anomeric carbon not involved in a glycosidic bond
✓
B. C-6 hydroxyl group in an equatorial position
C. Branch point at an α-1,6 linkage
D. Sulfate group on the C-2 carbon

📝 Explanation

A reducing end of a polysaccharide is the terminal monosaccharide with a free anomeric carbon that can undergo ring-opening to expose a free aldehyde or ketone group. All other residues are locked in glycosidic bonds and are non-reducing.

📖 Additional Information

  • Free anomeric carbon not involved in a glycosidic bond
  • C-6 hydroxyl group in an equatorial position
  • Branch point at an α-1,6 linkage
  • Sulfate group on the C-2 carbon

A reducing end of a polysaccharide is the terminal monosaccharide with a free anomeric carbon that can undergo ring-opening to expose a free aldehyde or ketone group. All other residues are locked in glycosidic bonds and are non-reducing.

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