Adsorption of Protein−Surfactant Complexes at the Water/Oil Interface

Interfacial tension measurements have been performed at the water/hexane interface on mixtures of the bovine milk protein β-lactoglobulin and positively charged cationic surfactants (alkytrimethylammonium bromides). The addition of surfactants with different chain lengths leads to the formation of p...

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Veröffentlicht in:Langmuir 2011-02, Vol.27 (3), p.965-971
Hauptverfasser: Pradines, Vincent, Fainerman, Valentin B, Aksenenko, Eugene V, Krägel, Jürgen, Wüstneck, Rainer, Miller, Reinhard
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container_end_page 971
container_issue 3
container_start_page 965
container_title Langmuir
container_volume 27
creator Pradines, Vincent
Fainerman, Valentin B
Aksenenko, Eugene V
Krägel, Jürgen
Wüstneck, Rainer
Miller, Reinhard
description Interfacial tension measurements have been performed at the water/hexane interface on mixtures of the bovine milk protein β-lactoglobulin and positively charged cationic surfactants (alkytrimethylammonium bromides). The addition of surfactants with different chain lengths leads to the formation of protein−surfactant complexes with different adsorption properties as compared to those of the single protein. In this study, the formation of complexes has been observed clearly for protein−long chain surfactant (TTAB and CTAB) mixtures, which has shown in addition to specific electrostatic interactions the relevance of hydrophobic interactions between surfactant molecules and the protein. The modeling of interfacial tension data by using a mixed adsorption model provides a quantitative understanding of the mixture behavior. Indeed, the value of the adsorption constant of the protein obtained in the presence of surfactants has strongly varied as compared to the single protein. Actually, this parameter which represents the affinity of the molecule for the interface is representative of the hydrophobic character of the compound and so of its surface activity. Even if a more hydrophobic and more surface active protein−surfactant complex has been formed, the replacement of this complex from the interface by surfactants close to their cmc was observed.
doi_str_mv 10.1021/la1040757
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subjects Adsorption
Chemistry
Colloids: Surfactants and Self-Assembly, Dispersions, Emulsions, Foams
Exact sciences and technology
General and physical chemistry
Models, Theoretical
Oils - chemistry
Proteins - chemistry
Surface physical chemistry
Surface-Active Agents - chemistry
Water - chemistry
title Adsorption of Protein−Surfactant Complexes at the Water/Oil Interface
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