FTIR studies of temperature influence on the DPPG model membrane

Severcan F., Dorohoi D.

JOURNAL OF MOLECULAR STRUCTURE, cilt.887, ss.117-121, 2008 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 887
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1016/j.molstruc.2008.02.039
  • Dergi Adı: JOURNAL OF MOLECULAR STRUCTURE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.117-121
  • Anahtar Kelimeler: Dipalmitoyl phosphatidyl glycerol (DPPG), FTIR spectra, Model membranes, Degree of order, INFRARED-SPECTROSCOPY, GRAMICIDIN-S
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

The thermal changes induced in dipalmitoyl phosphatidyl glycerol (DPPG) model membranes were studied by FIR technique. When temperature increases, the DPPG model membrane passes from a high ordered gel phase to a few ordered liquid crystalline phase. The very quick passing between the two phases is characterized by the main phase transition temperature at which the bilayers contain equal percentages of ordered and disordered phospholipids. The main phase transition induces important changes in the symmetric and asymmetric stretching vibrations of the -CH2 groups of the DPPG acyl tails. Mathematical methods for determining the main phase transition and the degree of order of the DPPG model membrane at a given temperature are proposed in this paper. (c) 2008 Elsevier B.V. All rights reserved.