Issue 29, 2015

Evidence of pressure induced intermolecular proton transfer via mutarotation: the case of supercooled d-fructose

Abstract

This paper describes a systematic investigation on the role of pressure in mutarotation kinetics of supercooled D-fructose using dielectric spectroscopy. The structural relaxation time acts as a suitable dynamical observable to monitor the mutarotation process that enables the construction of the kinetic curves. The reaction kinetic shapes have been analyzed using the Avrami model. At low temperature, sigmoidal kinetic curves are noted, which correspond to the high concentration of furanosidic forms. The magnitude of activation energy of the process significantly decreases with increasing pressure and is comparable to the solvated systems at 100 MPa. A potential connection between cooperative motion and the origin of intermolecular proton transfer via mutarotation at elevated pressure is also discussed. These experimental observations have fundamental significance on theoretical explanation of the mechanism involving mutarotation in sugars.

Graphical abstract: Evidence of pressure induced intermolecular proton transfer via mutarotation: the case of supercooled d-fructose

Article information

Article type
Paper
Submitted
08 Apr 2015
Accepted
16 Jun 2015
First published
16 Jun 2015

Phys. Chem. Chem. Phys., 2015,17, 19394-19400

Author version available

Evidence of pressure induced intermolecular proton transfer via mutarotation: the case of supercooled D-fructose

A. Cecotka, S. N. Tripathy and M. Paluch, Phys. Chem. Chem. Phys., 2015, 17, 19394 DOI: 10.1039/C5CP02044A

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