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The process of changing specific rotation at a given wavelength; for example, a solution of α-d-glucose recrystallized from its solution in acetic acid and freshly dissolved in water gives a rotation of [α] 20D = +112.2°, but when recrystallized from a boiling aqueous solution (as the β-form) it shows an initial rotation of [α] 20D = +18.7°; either solution, on standing, slowly changes its specific rotation to a value of [α] 20D = +52.7°, indicating a mixture of the two anomeric forms of d-glucose.
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References in periodicals archive ?
This disaccharide exists in two isomeric forms, [alpha]-lactose, and [beta]-lactose, which shows the phenomenon of mutarotation, that is, the interconversion of the stereocenters [6].
This incident is termed mutarotation. Rate of mutarotation is governed by factors like concentration, temperature, and pH (acidity) of solution.
The derivatization of reducing sugars with ABEE is easy and required no special equipment; moreover, the method showed higher sensitivity and elimination of the possible doublet that could be formed by mutarotation of the free reducing end of sugars [1].
As mutarotation was achieved in less than one hour, the GL stock solution (3.4 M) was prepared at least two hours before being used, to ensure the same actual mixture of acid and lactone concentrations in it [30].
Glucose undergoes mutarotation between its different anomers.