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Question

Why starch is a non reducing sugar?


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Solution

Starch is polymer, when you see you will find that starch doesn't contain an aldehyde group.

  • It lacks a free aldehyde or ketone group that would allow the starch structure to be opened up.
  • Iodine testing can be used to identify starch.
  • There is no free carbonyl group in starch.
  • Even though it contains numerous reducing glucose molecules, only the terminal glucose possesses hemiacetal when connected with a glycosidic bond, and this is insufficient to provide a favorable result for reducing sugars.
Basic chemical structure of polymeric starch. | Download Scientific Diagram

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