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Journal of Thermal Analysis and Calorimetry

, Volume 108, Issue 1, pp 19–24 | Cite as

Thermally-induced dielectric relaxation spectra in three aldohexose monosaccharides

  • Libby Yoerg
  • M. Ellen Matthews
  • Lakshmi Kaza
  • Naullage Indika Perera
  • David W. Ball
  • John Moran
  • Alan T. RigaEmail author
Article

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 g) and melting temperature (T m), 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.

Keywords

DEA Dielectric analysis DSC  Differential scanning calorimetry Monosaccharides Activation energy Transition temperatures 

Notes

Acknowledgements

This research was cited as the best undergraduate poster in competition at the North American Thermal Analysis Society, NATAS 2010 in Philadelphia PA. Thank you to all the organizers and participants of the conference who support undergraduate and graduate student researchers.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2011

Authors and Affiliations

  • Libby Yoerg
    • 1
  • M. Ellen Matthews
    • 2
  • Lakshmi Kaza
    • 1
  • Naullage Indika Perera
    • 1
  • David W. Ball
    • 1
  • John Moran
    • 3
  • Alan T. Riga
    • 1
    • 3
    Email author
  1. 1.Department of Chemistry, College of Science and Health ProfessionsCleveland State UniversityClevelandUSA
  2. 2.Buckeye PharmaceuticalsBeachwoodUSA
  3. 3.Department of ChemistrySouth EuclidUSA

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