Activation Energy of the Low-pH-Induced Lamellar to Bicontinuous Cubic Phase Transition in Dioleoylphosphatidylserine/Monoolein

Langmuir : the ACS Journal of Surfaces and Colloids
Toshihiko OkaMasahito Yamazaki

Abstract

Electrostatic interaction is an important factor for phase transitions between lamellar liquid-crystalline (Lα) and inverse bicontinuous cubic (QII) phases. We investigated the effect of temperature on the low-pH-induced Lα to double-diamond cubic (QII(D)) phase transition in dioleoylphosphatidylserine (DOPS)/monoolein (MO) using time-resolved small-angle X-ray scattering with a stopped-flow apparatus. Under all conditions of temperature and pH, the Lα phase was directly transformed into an intermediate inverse hexagonal (HII) phase, and subsequently the HII phase slowly converted to the QII(D) phase. We obtained the rate constants of the initial step (i.e., the Lα to HII phase transition) and of the second step (i.e., the HII to QII(D) phase transition) using the non-negative matrix factorization method. The rate constant of the initial step increased with temperature. By analyzing this result, we obtained the values of its apparent activation energy, Ea (Lα → HII), which did not change with temperature but increased with an increase in pH. In contrast, the rate constant of the second step decreased with temperature at pH 2.6, although it increased with temperature at pH 2.7 and 2.8. These results indicate that the value of Ea...Continue Reading

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Citations

Apr 30, 2016·Physical Chemistry Chemical Physics : PCCP·Mohammad Abu Sayem KaralMasahito Yamazaki
Sep 14, 2016·Journal of Colloid and Interface Science·Wye-Khay FongBen J Boyd
Dec 7, 2016·Nanoscale·Matthew D J QuinnShannon M Notley
Oct 11, 2017·Soft Matter·Monika KluzekMarc Schmutz
Oct 3, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Toshihiko OkaMasahito Yamazaki

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