β-Lactoglobulin Adsorption Layers at the Water/Air Surface: 4. Impact on the Stability of Foam Films and Foams

Autor: Martin E. Leser, Deniz Z. Gunes, Ulrich Kulozik, Reinhard Miller, G. Gochev, Björn Braunschweig, Cécile Gehin-Delval, V. Ulaganathan, Inga Retzlaff
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Geochemistry & Geophysics
STABILIZATION
coalescence
Materials science
lcsh:QE351-399.2
PH
DRAINAGE
adsorption layer
Disjoining pressure
PROTEIN
02 engineering and technology
010402 general chemistry
β-lactoglobulin
01 natural sciences
Stability (probability)
Adsorption
pH effect
disjoining pressure
cardiovascular diseases
Mining & Mineral Processing
FLUID INTERFACES
Coalescence (physics)
Science & Technology
lcsh:Mineralogy
beta-lactoglobulin
BUBBLES
Geology
Transition time
021001 nanoscience & nanotechnology
Geotechnical Engineering and Engineering Geology
Mineralogy
0104 chemical sciences
foam film
Isoelectric point
Chemical engineering
Physical Sciences
AQUEOUS FOAMS
lipids (amino acids
peptides
and proteins)
Foam film
THIN LIQUID-FILMS
0210 nano-technology
foam
MOLECULAR-STRUCTURE
BEHAVIOR
drainage
Zdroj: Minerals
Volume 10
Issue 7
Minerals, Vol 10, Iss 636, p 636 (2020)
Gochev, G.; Ulaganathan, V.; Retzlaff, I.; Gehin-Delval, C.; Gunes, D.; Leser, M.; Kulozik, U.; Miller, R.; Braunschweig, B.: β-Lactoglobulin Adsorption Layers at the Water/Air Surface: 4. Impact on the Stability of Foam Films and Foams. In: Minerals. Vol. 10 (2020) 7, 636. (DOI: /10.3390/min10070636)
ISSN: 2075-163X
DOI: 10.3390/min10070636
Popis: The complexity and high sensitivity of proteins to environmental factors give rise to a multitude of variables, which affect the stabilization mechanisms in protein foams. Interfacial and foaming properties of proteins have been widely studied, but the reported unique effect of pH, which can be of great interest to applications, has been investigated to a lesser extent. In this paper, we focus on the impact of pH on the stability of black foam films and corresponding foams obtained from solutions of a model globular protein&mdash
the whey &beta
lactoglobulin (BLG). Foam stability was analyzed utilizing three characteristic parameters (deviation time, transition time and half-lifetime) for monitoring the foam decay, while foam film stability was measured in terms of the critical disjoining pressure of film rupture. We attempt to explain correlations between the macroscopic properties of a foam system and those of its major building blocks (foam films and interfaces), and thus, to identify structure-property relationships in foam. Good correlations were found between the stabilities of black foam films and foams, while relations to the properties of adsorption layers appeared to be intricate. That is because pH-dependent interfacial properties of proteins usually exhibit an extremum around the isoelectric point (pI), but the stability of BLG foam films increases with increasing pH (3&ndash
7), which is well reflected in the foam stability. We discuss the possible reasons behind these intriguingly different behaviors on the basis of pH-induced changes in the molecular properties of BLG, which seem to be determining the mechanism of film rupture at the critical disjoining pressure.
Databáze: OpenAIRE
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