Mutarotation
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Mutarotation is the term given to the change in the specific rotation of plane polarized light, when it is passed through an aldohexose ( Monosaccharides with six carbon atoms and H-C=0 Group ). Mutarotation refers to the conversion of a pure anomer of a hemiacetal carbohydrate to an equilibrium mixture of two anomers.
As the name suggests, it is the change in rotation :
Muta - Change
Plane polarized light is obtained by passing ordinary light through a nicol prism.
During mutarotation, either α or β forms keep changing into the chain structure periodically to and fro.
Mutarotation also refers to the interconversion between the α and β anomers. However it must be converted to the open chain structure first before it can change conformation to the α or β position.
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