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000474186 1001_ $$00000-0002-1157-4611$$aKlacsová, Mária$$b0$$eCorresponding author
000474186 245__ $$aThermodynamic and structural study of DMPC–alkanol systems
000474186 260__ $$aCambridge$$bRSC Publ.$$c2021
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000474186 520__ $$aThe thermodynamic and structural behaviors of lamellar dimyristoylphosphatidylcholine-alkanol (abbreviation DMPC–CnOH, n = 8–18 is the even number of carbons in the alkyl chain) systems were studied by using DSC and SAXD/WAXD methods at a 0–0.8 CnOH : DMPC molar ratio range. Up to n ≤ 10 a significant biphasic effect depending on the main transition temperature t$_m$ on the CnOH concentration was observed. Two breakpoints were revealed: turning point (TP), corresponding to the minimum, and threshold concentration (c$_T$), corresponding to the end of the biphasic tendency. These breakpoints were also observed in the alkanol concentration dependent change in the enthalpy of the main transition ΔH$_m$. In the case of CnOHs with n > 10 we propose a marked shift of TP and c$_T$ to very low concentrations; consequently, only increase of tm is observed. A partial phase diagram was constructed for a pseudo-binary DMPC–C12OH system. We suggest a fluid–fluid immiscibility of the DMPC–C12OH system above c$_T$ with a consequent formation of domains with different C12OH contents. At a constant CnOH concentration, the effects of CnOHs on ΔH$_m$ and bilayer repeat distance were found to depend predominantly on the mismatch between CnOH and lipid chain lengths. Observed effects are suggested to be underlined by a counterbalancing effect of interchain van der Waals interactions and headgroup repulsion.
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000474186 7001_ $$0P:(DE-H253)PIP1007360$$aBóta, Attila$$b1
000474186 7001_ $$aWesth, Peter$$b2
000474186 7001_ $$0P:(DE-H253)PIP1002601$$aFunari, Sergio de Souza$$b3
000474186 7001_ $$0P:(DE-H253)PIP1008450$$aUhríková, Daniela$$b4
000474186 7001_ $$0P:(DE-H253)PIP1009344$$aBalgavý, Pavol$$b5
000474186 773__ $$0PERI:(DE-600)1476244-4$$a10.1039/D0CP04991C$$gVol. 23, no. 14, p. 8598 - 8606$$n14$$p8598 - 8606$$tPhysical chemistry, chemical physics$$v23$$x1463-9076$$y2021
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