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000050645 084__ $$2WoS$$aBiochemistry & Molecular Biology
000050645 084__ $$2WoS$$aBiophysics
000050645 1001_ $$0P:(DE-Juel1)128805$$aCsiszar, A.$$b0$$uFZJ
000050645 245__ $$aThe phase transition behavior of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) model membrane influenced by 2,4-dichlorophenol – an FT-Raman Spectroscopy Study
000050645 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2006
000050645 300__ $$a115 - 124
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000050645 440_0 $$010461$$aChemistry and Physics of Lipids$$v139$$x0009-3084
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000050645 520__ $$aThe effect of 2,4-dichlorophenol (DCP) on the structures and phase transitions of fully hydrated 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) liposomes was studied using FT-Raman spectroscopy. Whereas the Raman frequency shifts of the most frequently investigated bands of C-C and C-H stretching regions only indicate the main phase transition (P(beta')-L(alpha)) of the pure DPPC/water system, the Raman shift of C-H scissoring vibration at 1440 cm(-1) was found to be able to reveal the pretransition (L(beta')-P(beta')) as well. Analyzing the spectral parameters of the trans band at 1128 cm(-1), which does not overlap with DCP vibrational modes, a continuous decrease of trans conformations was found with increasing DCP concentration at 26 degrees C accompanying the phase transitions L(beta')-P(beta') and P(beta')-L(alpha). The intensity ratio of the symmetrical and asymmetrical methylene stretching bands (at 2850 cm(-1) and 2880 cm(-1)), defined as the disorder parameter by Levin [Levin, I.W., 1985. Two types of hydrocarbon chain interdigitation in sphingomielin bilayers. Biochemistry 24, 6282-6286], indicated that in the interdigitated phase (L(I)) the order is markedly high and comparable with that of L(beta). Both the phase transition P(beta')-L(alpha) in the DCP/DPPC molar ratio range of 10/100-50/100 and the phase transition L(I)-L(alpha) led to a significant increase of disordered chains and the presence of DCP molecules induced a more disordered chain region than that observed in the L(alpha) phase of DPPC. Nevertheless, it was found that the L(alpha) phase with DCP contains approximately the same amount of trans conformers than that without DCP.
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000050645 65320 $$2Author$$aDPPC liposomes
000050645 65320 $$2Author$$aphase transitions
000050645 65320 $$2Author$$aFF-Raman spectroscopy
000050645 65320 $$2Author$$a2.4-dichlorophenol
000050645 650_2 $$2MeSH$$a1,2-Dipalmitoylphosphatidylcholine: chemistry
000050645 650_2 $$2MeSH$$aChemistry, Physical
000050645 650_2 $$2MeSH$$aChlorophenols: chemistry
000050645 650_2 $$2MeSH$$aMembranes, Artificial
000050645 650_2 $$2MeSH$$aPhase Transition
000050645 650_2 $$2MeSH$$aPhysicochemical Phenomena
000050645 650_2 $$2MeSH$$aSensitivity and Specificity
000050645 650_2 $$2MeSH$$aSpectrum Analysis, Raman: methods
000050645 650_2 $$2MeSH$$aTemperature
000050645 650_7 $$00$$2NLM Chemicals$$aChlorophenols
000050645 650_7 $$00$$2NLM Chemicals$$aMembranes, Artificial
000050645 650_7 $$0120-83-2$$2NLM Chemicals$$a2,4-dichlorophenol
000050645 650_7 $$02644-64-6$$2NLM Chemicals$$a1,2-Dipalmitoylphosphatidylcholine
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000050645 7001_ $$0P:(DE-Juel1)VDB793$$aKoglin, E.$$b1$$uFZJ
000050645 7001_ $$0P:(DE-HGF)0$$aMeier, R.$$b2
000050645 7001_ $$0P:(DE-Juel1)129484$$aKlumpp, E.$$b3$$uFZJ
000050645 773__ $$0PERI:(DE-600)1496839-3$$a10.1016/j.chemphyslip.2005.11.005$$gVol. 139, p. 115 - 124$$p115 - 124$$q139<115 - 124$$tChemistry and physics of lipids$$v139$$x0009-3084$$y2006
000050645 8567_ $$uhttp://dx.doi.org/10.1016/j.chemphyslip.2005.11.005
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