title: The kinetics of mutarotation in L-fucose as monitored by dielectric and infrared spectroscopy.
abstract: 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.
authors.affiliation: Institute of Experimental Physics, University of Leipzig, Linnestr. 5, 04103 Leipzig, Germany.
authors.forename: Wilhelm
authors.initials: W
authors.lastname: Kossack
authors.affiliation: Institute of Experimental Physics, University of Leipzig, Linnestr. 5, 04103 Leipzig, Germany.
authors.forename: Wycliffe Kiprop
authors.initials: WK
authors.lastname: Kipnusu
authors.affiliation: Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland and Silesian Center of Education and Interdisciplinary Research, University of Silesia, 75 Pulku Piechoty 1A, 41-500 Chorzów, Poland.
authors.forename: Mateusz
authors.initials: M
authors.lastname: Dulski
authors.affiliation: NanoBioMedical Centre, ul. Umultowska 85, 61-614 Poznan, Poland.
authors.forename: Karolina
authors.initials: K
authors.lastname: Adrjanowicz
authors.affiliation: Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland and Silesian Center of Education and Interdisciplinary Research, University of Silesia, 75 Pulku Piechoty 1A, 41-500 Chorzów, Poland.
authors.forename: Olga
authors.initials: O
authors.lastname: Madejczyk
authors.affiliation: Department of Pharmacognosy and Phytochemistry, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia in Katowice, ul. Jagiellonska 4, 41-200 Sosnowiec, Poland.
authors.forename: Ewa
authors.initials: E
authors.lastname: Kaminska
authors.affiliation: Institute of Experimental Physics, University of Leipzig, Linnestr. 5, 04103 Leipzig, Germany.
authors.forename: Emmanuel Urandu
authors.initials: EU
authors.lastname: Mapesa
authors.affiliation: Institute of Experimental Physics, University of Leipzig, Linnestr. 5, 04103 Leipzig, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Tress
authors.affiliation: Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland and Silesian Center of Education and Interdisciplinary Research, University of Silesia, 75 Pulku Piechoty 1A, 41-500 Chorzów, Poland.
authors.forename: Kamil
authors.initials: K
authors.lastname: Kaminski
authors.affiliation: Institute of Experimental Physics, University of Leipzig, Linnestr. 5, 04103 Leipzig, Germany.
authors.forename: Friedrich
authors.initials: F
authors.lastname: Kremer
mesh_terms: D005643:Fucose / Q000737:chemistry*; D007700:Kinetics; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D005643:Fucose