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The Influence of Surface Potential on the Kinetics of Bovine Serum Albumin Adsorption on a Biomedical Grade 316LVM Stainless Steel Surface

Authors: Khawtar Hasan Ahmed, Sasha Omanovic


Polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) in combination with electrochemistry, was employed to study the influence of surface charge (potential) on the kinetics of bovine serum albumin (BSA) adsorption on a biomedical-grade 316LVM stainless steel surface is discussed. The BSA adsorption kinetics was found to greatly depend on the surface potential. With an increase in surface potential towards more negative values, both the BSA initial adsorption rate and the equilibrium (saturated) surface concentration also increased. Both effects were explained on the basis of replacement of well-ordered water molecules at the 316LVM / solution interface, i.e. by the increase in entropy of the system.

Keywords: Kinetics, Adsorption, biomedical grade stainless steel, bovine serum albumin (BSA), electrode surface potential / charge, PM-IRRAS, protein/surface interactions

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