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Does lactose mutarotate? Is it a reducing sugar? Explain.
Chapter 17, Problem 44P(choose chapter or problem)
QUESTION:
Problem 44P
Does lactose mutarotate? Is it a reducing sugar? Explain. Draw the two anomeric forms of lactose.
Questions & Answers
QUESTION:
Problem 44P
Does lactose mutarotate? Is it a reducing sugar? Explain. Draw the two anomeric forms of lactose.
ANSWER:
Solution 44P:
Here, we are going to explain about the mutarotation of lactose.
Mutarotation is defined as the change in the optical rotation because of the change in the equilibrium between two anomers, when the corresponding stereocenters interconvert.
Step 1:
Cyclic sugars show mutarotation as α and β anomeric forms interconvert. Lactose is an hemiacetal in water which is in equilibrium with the open chain form.
Thus, Lactose undergoes mutarotation.