Glucose (hemiacetal) and fructose (hemiketal) can undergo mutarotation.

What is mutarotation with example?

For example, if a solution of β-D-glucopyranose is dissolved in water, its specific optical rotation will be +18.7°. Over time, some of the β-D-glucopyranose will undergo mutarotation to become α-D-glucopyranose, which has an optical rotation of +112.2°.

Does maltose show mutarotation?

Maltose undergoes mutarotation at its hemiacetal anomeric center. Recall that the process occurs via an open-chain structure containing an aldehyde. The free aldehyde formed by ring opening can react with Fehling's solution, so maltose is a reducing sugar.