Effect of pH and electrolyte concentration on rising air bubbles in β-lactoglobulin solutions

被引：19
|
作者：
Ulaganathan, V. [1 ]
Gochev, G. [1 ,2 ]
Gehin-Delval, C. [3 ]
Leser, M. E. [3 ]
Gunes, D. Z. [3 ]
Miller, R. [1 ]
机构：
[1] Max Planck Inst Colloids & Interfaces, D-14424 Potsdam, Germany
[2] Bulgarian Acad Sci, Inst Phys Chem, BU-1113 Sofia, Bulgaria
[3] Nestle Res Ctr, CH-1000 Lausanne 26, Switzerland
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2016年 / 505卷
关键词：
Rising bubble; beta-Lactoglobulin pH effect; Electrolyte concentration effect; Dynamic adsorption layer; Protein adsorption; WATER-INTERFACE; SURFACE; EQUILIBRIUM; TRANSITIONS; VELOCITIES; STABILITY; RHEOLOGY; DYNAMICS; LAYERS; FOAMS;
D O I：
10.1016/j.colsurfa.2016.03.059
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：
The local velocity profile (LVP) of a rising bubble can serve as a fingerprint for the dynamic behavior of the adsorption/desorption processes going on at a solution/air interface. The LVP of bubbles in beta-lactoglobulin (BLG) solutions proves to be extremely sensitive for the adsorption of BLG at low bulk concentrations. In addition, it can show the impact of pH and ionic strength on the dynamic surface properties of BLG at the solution/air interface. It is observed that the time for establishing an immobile rigid surface layer at the rising bubble surface becomes shorter with increasing pH from 3 to 7. A peculiar behavior is observed at the isoelectric point (IEP) where the LVPs show irregularities. Under dynamic conditions BLG does not exhibit highest surface active at the IEP within the range of BLG concentrations as measured by the rising bubble technique. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：165 / 170
页数：6
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