A combined surface pressure-interfacial shear rheology study of the interactions of proteins with phospholipids monolayers

Roberts, S.A., Kellaway, I.W., Taylor, K.M.G., Peters, K. and Warburton, B. (2005) A combined surface pressure-interfacial shear rheology study of the interactions of proteins with phospholipids monolayers. Langmuir, 21 . pp. 7342-7348. 10.1021/la050272l.

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DOI: 10.1021/la050272l


Combined Surface Pressure-Interfacial Shear Rheology Study of the Effect of pH on the Adsorption of Proteins at the Air-Water Interface Simon A. Roberts,* Ian W. Kellaway, Kevin M. G. Taylor, Brian Warburton, and Kevin Peters The School of Pharmacy, University of London, 29/39 Brunswick Square, London WC1N 1AX, United Kingdom Received January 31, 2005 In Final Form: April 28, 2005 Abstract: The effect of pH on the adsorption of catalase and lysozyme at the air-water interface has been studied using a combined surface pressure-interfacial shear rheology technique. The results presented show that the rate of development of interfacial phenomena increases as the pH of the subphase approaches the isoelectric point of the protein under investigation. The development of the measured interfacial rheological parameters is due to an increased rate of cross-link formation within the resultant interfacial gel. The formation of the interfacial gels has been modeled using a combination of the Smoluchowski theory for the coagulation of an aerosol or fog and classic rubber elasticity theory. The enhanced rate of cross-link formation at the isoelectric point is a result of an in-surface phase separation brought about by cooperative deionization of the protein molecules near their isoelectric point. Simultaneous measurements of surface pressure and interfacial rheology have enabled us to show that the development of a gel-like interfacial network coincides with observed increases in surface pressure.

Item Type:Article
Departments, units and centres:Department of Pharmaceutics > Department of Pharmaceutics
ID Code:526
Journal or Publication Title:Langmuir
Deposited By:Library Staff
Deposited On:05 Jan 2007
Last Modified:14 Oct 2011 10:22

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