Alternative methods of determining phase transition temperatures of phospholipids that constitute liposomes on the example of DPPC and DMPC

Published on May 1, 2014in Thermochimica Acta2.25
· DOI :10.1016/j.tca.2014.03.020
Danuta Pentak12
Estimated H-index: 12
(University of Silesia in Katowice)
Abstract In this work, alternatives to differential scanning calorimetry (DSC) as a method of determining the main phospholipid phase transition temperature are presented. The bilayer phase transitions from the ripple gel phase ( P β ′ ) to the liquid-crystal phase ( L α ) of 1,2-dipalmitoyl- sn -glycerol-3-phosphocholine (DPPC) and 1,2-dimyristoyl- sn -glycero-3-phosphocholine (DMPC) were studied by differential scanning calorimetry (DSC), Fourier transform infrared (FT-IR), nuclear magnetic resonance (NMR), and electron paramagnetic resonance (EPR) methods. In this work, two correlations between the DSC and FT-IR methods, and NMR and EPR methods are shown. The proposed methods allow for determining the T C temperature with a high degree of accuracy. Furthermore, a comparison of results obtained using the DSC and FT-IR methods allowed for an observation of a new DMPC phase transition. The liposomes analyzed in this work were obtained by the modified reverse-phase evaporation method (mREV).
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