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Solid Surface Chemical and Physical Effects on the Adsorption of Recombinant Factor VIII

The adsorption of a recombinant Factor VIII to silica surfaces coated to present different hydrophilic/hydrophobic, electrostatic and steric characteristics was monitored in situ, with ellipsometry. rFVIII adsorption affinity was high for hydrophobic surfaces and hydrophilic, charged surfaces. A lower affinity was recorded between rFVIII and a neutral hydrophilic surface, with substantial reduction in rFVIII adsorption to electronically neutral surfaces presenting pendant poly[ethylene oxide] chains. We conclude that steric repulsion is a requirement for minimizing rFVIII adsorption at solid surfaces.