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Glucose and mannose have a different degree of sweetness, implying different affinity to the sweet taste receptor. While the receptor structure is still undefined, there are several geometrical models for their binding mechanism. A detailed study of the hydration structure of sugars with known degree of sweetness is bound to provide information on the accuracy of such models. Our neutron diffraction study on the hydration of glucose and mannose show that both α- and β-glucose form strong hydrogen bonds with water, and that the steric hindrance of their first hydration shell matches the receptor geometrical model. The α-anomer of mannose has a similar, well-defined first hydration shell, but with fewer and weaker hydrogen bonds compared to glucose. Conversely, the hydration shell of β-mannose (reported as bitter) does not match the receptor geometrical model. These findings suggest a link between the hydration shell of sugars and their degree of sweetness.

Original publication

DOI

10.1021/acs.jpcb.7b03919

Type

Journal article

Journal

J Phys Chem B

Publication Date

24/08/2017

Volume

121

Pages

7771 - 7776

Keywords

Glucose, Hydrogen Bonding, Mannose, Molecular Conformation, Sweetening Agents, Taste, Water