Protein adsorption on well-characterized polyethylene oxide brushes on gold: dependence on molecular weight and grafting density.

TitleProtein adsorption on well-characterized polyethylene oxide brushes on gold: dependence on molecular weight and grafting density.
Publication TypeJournal Article
Year of Publication2013
AuthorsTaylor W, Jones RAL
JournalLangmuir : the ACS journal of surfaces and colloids
Volume29
Issue20
Pagination6116-22
Date Published2013 May 21
Abstract

The adsorption of lysozyme protein was measured ex situ on well-characterized gold surfaces coated by end-tethered polyethylene oxide brushes of various molecular weights and controlled grafting densities. The adsorbed amount of protein for different molecular weight brushes was found to collapse onto one master curve when plotted against brush coverage. We interpret this relationship in terms of a model involving site-blocking of the adsorption of proteins at the substrate and discuss the role of the physical attraction of PEO segments to gold. We account for our observation of a simple exponential relationship between protein adsorption and normalized brush coverage with a simple protein adsorption model. In contrast to other studies in similar systems, we do not observe protein adsorption on brushes at high grafting density, and we suggest that this discrepancy may be due to the solubility effects of salt upon the brushes, influencing their protein binding affinity, in the limit of high grafting density and high brush volume fraction.

DOI10.1039/c3an01929b
Alternate JournalLangmuir