High pressure infrared spectroscopy in biological and biomedical studies


Taymaz A., Breiki G., Kanat I., Karaman A., Wong P.

NATO Advanced Research Workshop on Analytical Use of Fluorescent Probes in Oncology, Florida, United States Of America, 14 - 18 October 1995, vol.286, pp.383-392 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 286
  • City: Florida
  • Country: United States Of America
  • Page Numbers: pp.383-392

Abstract

Recent advances in infrared spectroscopy have made it possible to study structural and dynamic properties of biomembranes and model systems at molecular level by spectral analysis. Using pressure tuning infrared spectroscopy we studied intermolecular interactions in 1,2 dioleoyl phosphatidylcholine (DOPC), 1,2 dipalmitoyl phosphatidylcholine (DPPC). Infrared spectra from model biomembranes and abnormal tissues were measured and compared to their normal species under 0 to 45 kbar pressure. Discontinuities in the pressure dependencies of various infrared spectral parameters indicate that structural phase transitions occur at 4.2, 5 and 15 kbar. More than two correlation field components of CH2 scissoring modes are observed in spectra of the high-pressure phases, suggesting that more than two acyl chains are present in the unit cell of these phases.