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- Title
Thermally-induced dielectric relaxation spectra in three aldohexose monosaccharides.
- Authors
Yoerg, Libby; Matthews, M.; Kaza, Lakshmi; Perera, Naullage; Ball, David; Moran, John; Riga, Alan
- Abstract
Three aldohexose monosaccharides, d-glucose, d-mannose, and d-galactose, were examined by scanning temperature dielectric analysis (DEA) from ambient temperatures through their melts. Phase transitions, including glass transition ( T) and melting temperature ( T), were evaluated by differential scanning calorimetry (DSC). The monosaccharides were found to exhibit thermally-induced dielectric loss spectra in their amorphous-solid phase before melting. Activation energies for electrical charging of each of the monosaccharides were calculated from an Arrhenius plot of the tan delta ( e″/ e′, dielectric loss factor/relative permittivity) peak frequency versus reciprocal temperature in Kelvin. The DEA profiles were also correlated with the DSC phase diagrams, showing the changes in electrical behavior associated with solid-solid and solid-liquid transitions.
- Subjects
DIELECTRIC relaxation; MANNOSE; GLUCOSE; GALACTOSE; PHASE transitions; DIFFERENTIAL scanning calorimetry; DIELECTRIC loss; ACTIVATION energy; TRANSITION temperature
- Publication
Journal of Thermal Analysis & Calorimetry, 2012, Vol 108, Issue 1, p19
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-011-1923-9