Advertisement

Thermally stimulated depolarization currents in hydrated casein solid samples

  • P. Pissis
  • A. Anagnostopoulou-Konsta
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 78)

Abstract

Thermally stimulated depolarization current measurements on hydrated solid samples of the protein casein in the temperature range 77–300 K and the water content range 1–24 % (w/w) show two dispersions, a low-temperature dispersion in the range 100–170 K, and a high-temperature dispersion in the range 190–290 K. The high-temperature dispersion was studied in detail using several experimental techniques offered by the TSDC method. It consists, for high water contents, of two complex bands numbered I and II in the order of increasing temperature. Band I is attributed to water-assisted relaxation of polar side chains ans band II to space-charge relaxation.

Key words

Biopolymers hydration properties dielectric relaxation depolarization current 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Anagnostopoulou-Konsta A, Pissis P (1987) J Phys D 20:1168–1174CrossRefGoogle Scholar
  2. 2.
    Kent M, Meyer W (1984) J Phys D 17:1687CrossRefGoogle Scholar
  3. 3.
    Vanderschueren J, Gasiot J (1979) Field-induced thermally stimulated currents, In: Bräunlich P (ed) Thermally stimulated relaxation in solids. Springer, Berlin pp 135–223Google Scholar
  4. 4.
    Pissis P, Diamanti D, Boudouris G (1983) J Phys D 16:1311CrossRefGoogle Scholar
  5. 5.
    Pethig R (1979) Dielectric and electronic properties of biological materials. J Wiley and Sons, ChichesterGoogle Scholar
  6. 6.
    Pissis P, Anagnostopoulou-Konsta A (1985) In: Sessler GM, Gerhard-Multhaupt R (eds) Proceedings of the 5th International Symposium on Electrets, Heidelberg, IEEE Service Center, Piscataway, pp 842–847Google Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1998

Authors and Affiliations

  • P. Pissis
    • 1
  • A. Anagnostopoulou-Konsta
    • 1
  1. 1.Physics DepartmentNational Technical University AthensAthensGreece

Personalised recommendations