Dilational visco-elasticity of BLG adsorption layers at the solution/tetradecane interface - Effect of pH and ionic strength

被引：7

作者：

Won, J. Y. ^{[1
]}

Gochev, G. G. ^{[1
,2
]}

Ulaganathan, V. ^{[1
]}

Kraegel, J. ^{[1
]}

Aksenenko, E. V. ^{[3
]}

Fainerman, V. B. ^{[4
]}

Miller, R. ^{[1
]}

机构：

[1] Max Planck Inst Colloids & Interfaces, D-14424 Golm, Germany

[2] Bulgarian Acad Sci, Inst Phys Chem, BU-1113 Sofia, Bulgaria

[3] Inst Colloid Chem & Chem Water, Kiev, Ukraine

[4] Med Univ Donetsk, Donetsk, Ukraine

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2017年 / 521卷

关键词：

Beta-lactoglobulin; Water-tetradecane interface; Drop profile analysis tensiometry; Oscillating drop method; Dilational visco-elasticity; pH effect; Ionic strength effect; AIR-WATER-INTERFACE; DROP SHAPE-ANALYSIS; BETA-LACTOGLOBULIN; DYNAMIC MEASUREMENTS; SURFACE; RHEOLOGY; PROTEINS; BEHAVIOR; BALANCE; CASEIN;

D O I：

10.1016/j.colsurfa.2016.08.054

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Drop profile analysis tensiometry is applied to measure the dilational visco-elasticity of BLG at the buffered aqueous solution/tetradecane (W/TD) interface using oscillating drops of TD immersed in W at frequencies between 0.01-0.2 Hz. The buffered solutions were investigated at pH 3, pH 5 (isoelectric point) and pH 7 at different buffer concentrations (1 mM, 10 mM and 100 mM). The real part of the complex visco-elasticity shows a maximum when plotted as a function of the interfacial pressure Pi. In contrast to the water/air surface (W/A) where we observe maximum elasticity values between 15 and 20 mN/m, at the W/TD interface these maximum values are up to 65-70 mM/m, which is in parallel with the much higher interfacial pressure values at the W/TD interface when compared to the W/A surface. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：204 / 210

页数：7

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