Coalescence stability of emulsion-sized droplets at a planar oil–water interface and the relationship to protein film surface rheology

SummaryThe properties of adsorbed films of αs1-, β- and κ-casein and sodium caseinate are compared at the planar oil–water interface, at the surface of emulsion droplets, and at the surface of polystyrene latex particles. Attention is directed towards understanding (i) the relationship between the molecular characteristics of the caseins and their surface activities and surface viscosities at the oil–water interface, (ii) the nature of competitive adsorption between the caseins (particularly αs1- and β-), and (iii) the effect of Na and Ca ion concentrations on electrophoretic mobilities and flocculation behaviour.

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Protonation-induced molecular permeation at the oil/water interface in an electric field

Physical Chemistry Chemical Physics ◽

10.1039/c8cp04028a ◽

2018 ◽

Vol 20 (46) ◽

pp. 29012-29017 ◽

Cited By ~ 1

Author(s):

Shenglong Gan ◽

Longbin Chen ◽

Yancong Feng ◽

Yong Deng ◽

Rui Zhou ◽

...

Keyword(s):

Electric Field ◽

Applied Voltage ◽

Water Interface ◽

Oil Water ◽

The Relationship ◽

Protonation Degree

The relationship between the protonation degree increment and applied voltage was proposed as a guide for controlling the protonation via applying an electric field.

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Partitioning Behavior and Interfacial Activity of Phenolic Acid Derivatives and their Impact on β-Lactoglobulin at the Oil-Water Interface

Food Biophysics ◽

10.1007/s11483-020-09663-7 ◽

2021 ◽

Author(s):

Alina Bock ◽

Ulrike Steinhäuser ◽

Stephan Drusch

Keyword(s):

Phenolic Compounds ◽

Aqueous Phase ◽

Phenolic Acid ◽

Water Interface ◽

Interfacial Behavior ◽

Protein Film ◽

Interfacial Activity ◽

Oil Water ◽

Phenolic Acid Derivatives ◽

Partitioning Behavior

AbstractProteins are able to stabilize dispersed food systems due to their amphiphilic nature, acting as emulsifiers. Their interfacial properties can be influenced by different methods, including the formation of protein-phenol nanocomplexes. In this study, the interfacial behavior of phenolic compounds and protein-phenol nanocomplexes was first characterized according to the oil-water partitioning behavior of phenolic acid derivatives according to their molecular structure and its impact on interfacial tension. The influence of the phenolic compounds on protein film formation and its properties by dilatational rheology was then evaluated. The most phenolic acid derivatives are predominantly present in the aqueous phase. Despite their hydrophobic benzene body, weak interfacial activity was observed depending on their chemical structure. This result supports possible protein-phenol nanocomplex formation in the aqueous phase and possible interactions at the oil-water interface. Protein-phenol nanocomplexes showed decreased interfacial adsorption properties and decreased viscoelastic interfacial behavior, depending on the expansion of the delocalized π-electrons in the phenol.

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Porous materials from cellulose nanocrystal and mxene surfactants at the oil/water interface

10.1021/scimeetings.0c07366 ◽

2020 ◽

Author(s):

Bingqing qian ◽

Haiqiao Wang ◽

Dong Wang ◽

Hao-Bin Zhang ◽

Jessica Wu ◽

...

Keyword(s):

Porous Materials ◽

Cellulose Nanocrystal ◽

Water Interface ◽

Oil Water

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Polarizability and nonpolarizability of oil-water interfaces with relevance to a.c. impendance measurements

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19910112 ◽

1991 ◽

Vol 56 (1) ◽

pp. 112-129 ◽

Cited By ~ 14

Author(s):

Takashi Kakiuchi ◽

Mitsugi Senda

Keyword(s):

Charge Transfer ◽

Numerical Calculation ◽

Supporting Electrolyte ◽

Water Interface ◽

Migration Effect ◽

Ac Current ◽

Stationary Interface ◽

Oil Water ◽

Anion Transfer

We have estimated the degree of polarizability of a polarized oil-water interface used as a working interface and that of the nonpolarizability of a nonpolarized interface used as a reference oil-water interface from the numerical calculation of dc and ac current vs potential behavior at both interfaces. Theoretical equations of dc and ac currents for simultaneous cation and anion transfer of supporting electrolytes have been derived for the planar stationary interface for reversible and quasi-reversible cases. In the derivation, the migration effect and the coupling of the cation and anion transfer have been incorporated. The transfer of ions constituting a supporting electrolyte contributes to the total admittance of the interface even in the region where the interface may be considered as polarized in dc sense, as pointed out first by Samec et al. (J. Electroanal. Chem. 126, 121 (1981)). Moreover, the reference oil-water interface is not ideally reversible, so that the contribution from this interface to the measured admittance cannot be negligible, unless the area of the reference oil-water interface is much larger than that of the working oil-water interface. The effect of non-ideality of the reference oil-water interface on the determination of double layer capacitances and kinetic parameters of charge transfer at the working oil-water interface has been estimated.

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