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Classification of Carbohydrates - Polysaccharides

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Estimated time: 4 minutes
CBSE: Class 12
Maharashtra State Board: Class 12

Key Points: Polysaccharides

  • Starch — A polymer of α-D-glucopyranose. It has two components: amylose (α-1,4-glycosidic linkage) and amylopectin (both α-1,4 and α-1,6-glycosidic linkages).
  • Cellulose — A polymer of β-glucopyranose units linked by β-1,4-glycosidic bonds.
  • Glycogen — A polymer of glucose units.
  • Linkage Comparison —
    Polysaccharide Monomer Linkage
    Amylose (Starch) α-D-glucopyranose α-1,4
    Amylopectin (Starch) α-D-glucopyranose α-1,4 and α-1,6
    Cellulose β-glucopyranose β-1,4
    Glycogen Glucose
     
  • Key Distinction — Starch and Cellulose are both glucose polymers but differ in linkage type: Starch has α-glycosidic bonds (digestible by humans), while Cellulose has β-glycosidic bonds (not digestible by humans).

Shaalaa.com | Biomolecules part 12 (Polysaccharides :- starch, cellulose, glycogen)

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