The kinetics of mutarotation in L-fucose as monitored by dielectric and infrared spectroscopy

Publish Year: 2014
Publisher:  The Journal of Chemical Physics 2014, 140, 215101
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W. Kossack, W. K. Kipnusu, M. Dulski, K. Adrjanowicz, O. Madejczyk, E. Kaminska, E. U. Mapesa, M. Tress, K. Kaminski, F. Kremer
Fourier Transform Infrared Spectroscopy and Broadband Dielectric Spectroscopy are combined to trace kinetics of mutarotation in L-fucose. After quenching molten samples down to temperatures between T = 313 K and 328 K, the concentrations of two anomeric species change according to a simple exponential time dependence, as seen by an increase in absorbance of specific IR-vibrations. In contrast, the dielectric spectra reveal a slowing down of the structural (α-) relaxation process according to a stretched exponential time dependence (stretching exponent of 1.5 ± 0.2). The rates of change in the IR absorption for α- and β-fucopyranose are (at T = 313 K) nearly one decade faster than that of the intermolecular interactions as measured by the shift of the α-relaxation. This reflects the fact that the α-relaxation monitors the equilibration at a mesoscopic length scale, resulting from fluctuations in the anomeric composition.

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