Determination of the activation energy of rotational microviscosity in the DPPC multilayer dispersions and the effects of high electrolyte concentration on rotational microviscosity

Aydas C., Korkmaz M.

JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol.45, no.4, pp.975-982, 2004 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 45 Issue: 4
  • Publication Date: 2004
  • Journal Name: JOURNAL OF THE KOREAN PHYSICAL SOCIETY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.975-982
  • Hacettepe University Affiliated: No

Abstract

In the present work, electron spin resonance (ESR) spectroscopy was used to study, through the rotational microviscosity approach, the effects of high electrolyte concentrations on the phase behaviors of DPPC (dipalmitoylphosphatidylcholine) multilayer aqueous dispersions of lipid concentrations of 25 mg/ml and 50 mg/ml containing a 5-SASL spin label. The correlation time involved in the definition of rotational microviscosity was calculated using two different equations given in the literature. The activation energies of the rotational viscosity in the gel and the liquid crystal phases and the main transition temperatures were calculated from constructed Andrade plots, The results obtained are discussed in light of the literature data, and the validity of the approach was emphasized.