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Kirby SM, Zhang X, Russo PS, et al. Formation of a Rigid Hydrophobin Film and Disruption by an Anionic Surfactant at an Air/Water Interface. Langmuir. 2016;32(22):5542-51doi: 10.1021/acs.langmuir.6b00809.
Kirby, S. M., Zhang, X., Russo, P. S., Anna, S. L., & Walker, L. M. (2016). Formation of a Rigid Hydrophobin Film and Disruption by an Anionic Surfactant at an Air/Water Interface. Langmuir : the ACS journal of surfaces and colloids, 32(22), 5542-51. https://doi.org/10.1021/acs.langmuir.6b00809
Kirby, Stephanie M, et al. "Formation of a Rigid Hydrophobin Film and Disruption by an Anionic Surfactant at an Air/Water Interface." Langmuir : the ACS journal of surfaces and colloids vol. 32,22 (2016): 5542-51. doi: https://doi.org/10.1021/acs.langmuir.6b00809
Kirby SM, Zhang X, Russo PS, Anna SL, Walker LM. Formation of a Rigid Hydrophobin Film and Disruption by an Anionic Surfactant at an Air/Water Interface. Langmuir. 2016 Jun 07;32(22):5542-51. doi: 10.1021/acs.langmuir.6b00809. Epub 2016 May 23. PMID: 27164189.
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Langmuir. 2016 Jun 07;32(22):5542-51. doi: 10.1021/acs.langmuir.6b00809. Epub 2016 May 23.

Formation of a Rigid Hydrophobin Film and Disruption by an Anionic Surfactant at an Air/Water Interface.

Langmuir : the ACS journal of surfaces and colloids

Stephanie M Kirby, Xujun Zhang, Paul S Russo, Shelley L Anna, Lynn M Walker

Affiliations

  1. School of Materials Science and Engineering and School of Chemistry and Biochemistry, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.

PMID: 27164189 DOI: 10.1021/acs.langmuir.6b00809

Abstract

Hydrophobins are amphiphilic proteins produced by fungi. Cerato-ulmin (CU) is a hydrophobin that has been associated with Dutch elm disease. Like other hydrophobins, CU stabilizes air bubbles and oil droplets through the formation of a persistent protein film at the interface. The behavior of hydrophobins at surfaces has raised interest in their potential applications, including use in surface coatings, food foams, and emulsions and as dispersants. The practical use of hydrophobins requires an improved understanding of the interfacial behavior of these proteins, alone and in the presence of added surfactants. In this study, the adsorption behavior of CU at air/water interfaces is characterized by measuring the surface tension and interfacial rheology as a function of adsorption time. CU is found to adsorb irreversibly at air/water interfaces. The magnitude of the dilatational modulus increases with adsorption time and surface pressure until CU eventually forms a rigid film. The persistence of this film is tested through the sequential addition of strong surfactant sodium dodecyl sulfate (SDS) to the bulk liquid adjacent to the interface. SDS is found to coadsorb to interfaces precoated with a CU film. At high concentrations, the addition of SDS significantly decreases the dilatational modulus, indicating disruption and displacement of CU by SDS. Sequential adsorption results in mixed layers with properties not observed in interfaces generated from complexes formed in the bulk. These results lend insight to the complex interfacial interactions between hydrophobins and surfactants.

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