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  Effect of Solution pH on the Adsorption of BLG at the Solution/Tetradecane Interface

Won, J. Y., Gochev, G., Ulaganathan, V., Krägel, J., Aksenenko, E., Fainerman, V., et al. (2017). Effect of Solution pH on the Adsorption of BLG at the Solution/Tetradecane Interface. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 519, 161-167. doi:10.1016/j.colsurfa.2016.05.042.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-AEC4-F Version Permalink: http://hdl.handle.net/21.11116/0000-0001-8CEA-A
Genre: Journal Article

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 Creators:
Won, J. Y.1, Author              
Gochev, G.1, Author              
Ulaganathan, V.1, Author              
Krägel, J.1, Author              
Aksenenko, E.V., Author
Fainerman, V.B., Author
Miller, R.1, Author              
Affiliations:
1Reinhard Miller, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863501              

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Free keywords: β-lactoglobulin; water-tetradecane interface; drop profile analysis tensiometry; dynamic interfacial tensions; equation of state; pH effect
 Abstract: Using drop profile analysis tensiometry the adsorption dynamics and the equilibrium equation of state of β-lactoglobulin (BLG) at the water/tetradecane (W/TD) interface are studied at pH 3, 5 and 7. The data are well described by a thermodynamic adsorption model using almost identical model parameters for all three pH values except for the surface activity coefficient. The surface pressure isotherms at the water/air (W/A) surface exhibit much steeper run than interfacial pressure at the W/TD interface for any of the studied cases at pH 3, 5 and 7, and the calculated adsorption isotherm data point at smaller adsorbed amounts for these pH. This seems to be in contrast to the much larger interfacial pressure changes reached at high \BLG\} concentrations at the W/TD interface, which are almost three times higher than those at the W/A surface. The observations can be explained by a strong interaction between \{BLG\ and the oil molecules at the interface. The dynamic interfacial tensions can be adequately described by a mixed adsorption model, assuming a diffusional transport of the protein molecules in the aqueous bulk phase and an adsorption mechanism which assumes a change of the adsorption activity parameter in dependence of the interfacial coverage.

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 Dates: 2016-05-162017-04-20
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1016/j.colsurfa.2016.05.042
BibTex Citekey: Won2016
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Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Source Genre: Journal
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Publ. Info: Amsterdam, NL : Elsevier
Pages: - Volume / Issue: 519 Sequence Number: - Start / End Page: 161 - 167 Identifier: ISSN: 0927-7757