Interaction of photosensitizers with liposomes containing unsaturated lipid

István Voszka, Marianna Budai, Zsófia Szabó, Philip Maillard, Gabriella Csík, Pál Gróf

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Small unilamellar liposomes were made of dipalmitoyl-phosphatidylcholine and dioleoyl-phosphatidylcholine, and photosensitized by a symmetrically or an asymmetrically substituted glycosilated tetraphenyl-porphyrin derivative. As differential scanning calorimetry and electron paramagnetic resonance spectroscopy (EPR) revealed these porphyrin derivatives were localized in different depth within the lipid bilayer. Both porphyrin derivatives were able to induce photoreaction and consequent structural changes in the membrane. 5-, 12-, or 16-doxyl stearic acid labeled lipid bilayers were applied and the efficiency of photoinduced reaction was followed by the decay of their EPR signal amplitude. Light dose-dependent destruction of nitroxide radical proved to be dependent on the position of spin label. In this process the porphyrin localized in closer connection with the double bond of unsaturated fatty acid was more effective. EPR signal decay was also dependent on the unsaturated fatty acid content of the liposome and the oxygen saturation of the solvent.

Original languageEnglish
Pages (from-to)63-71
Number of pages9
JournalChemistry and Physics of Lipids
Volume145
Issue number2
DOIs
Publication statusPublished - Feb 1 2007

Keywords

  • Differential scanning calorimetry
  • Electron paramagnetic resonance
  • Liposomes
  • Photosensitizer
  • Porphyrin
  • Spin labeling

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Organic Chemistry
  • Cell Biology

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