This title appears in the Scientific Report : 2015 

Lyotropic model membrane structures of hydrated DPPC: DSC and small-angle X-ray scattering studies of phase transitions in the presence of membranotropic agents
Bulavin, L. A.
Soloviov, D. V. / Gordeliy, Valentin / Svechnikova, O. S. / Krasnikova, A. O. / Kasian, N. A. / Vashchenko, O. V. / Lisetski, L. N. (Corresponding author)
Strukturbiochemie ; ICS-6
Phase transitions, 88 (2015) 6, S. 582 - 592
London [u.a.] Taylor & Francis 2015
10.1080/01411594.2014.1002784
Journal Article
Functional Macromolecules and Complexes
Please use the identifier: http://dx.doi.org/10.1080/01411594.2014.1002784 in citations.
Multibilayer structures of hydrated phospholipids, often considered as model biological membranes, are, from the physical viewpoint, lyotropic liquid crystalline systems undergoing temperature-induced mesomorphic phase transitions. Effects of silver nitrate and urocanic acid on lyotropic phase states of hydrated L-α-dipalmitoylphosphatidylcholine (DPPC) have been studied by small-angle X-ray scattering and differential scanning calorimetry (DSC). Both methods show increase of the main phase-transition temperature (Tm) of hydrated DPPC upon introduction of AgNO3 or urocanic acid, decrease of pre-transition temperature (Tp) in the presence of urocanic acid and its increase in the presence of AgNO3. Thus, urocanic acid widened the ripple-phase temperature region. Silver nitrate caused the appearance of an additional high-temperature peak on DSC thermograms, evidencing phase separation in the system. Both agents caused minor effects on DPPC lipid bilayer repeat distance (D) in gel phase, but resulted in noticeable increase of D in the liquid crystal phase with temperature as compared to undoped DPPC structures.