title: Adsorption of fibrinogen on a biomedical-grade stainless steel 316LVM surface: a PM-IRRAS study of the adsorption thermodynamics, kinetics and secondary structure changes.
abstract: Polarization-modulation infrared reflection-absorption spectroscopy (PM-IRRAS) was employed to investigate the interaction of serum protein fibrinogen with a biomedical-grade 316LVM stainless steel surface, in terms of the adsorption thermodynamics, kinetics and secondary structure changes of the protein. Apparent Gibbs energy of adsorption values indicated a highly spontaneous and strong adsorption of fibrinogen onto the surface. The kinetics of fibrinogen adsorption were successfully modeled using a pseudo first-order kinetic model. Deconvolution of the amide I bands indicated that the adsorption of fibrinogen on 316LVM results in significant changes in the protein's secondary structure that occur predominantly within the first minute of adsorption. Among the investigated structures, the alpha-helix structure undergoes the smallest changes, while the beta-sheet and beta-turns structures undergo significant changes. It was shown that lateral interactions between the adsorbed molecules do not play a role in controlling the secondary structure changes. An increase in temperature induced changes in the secondary structure of the protein, characterized by a loss of the alpha-helical content and its transformation into the beta-turns structure.
authors.affiliation: Department of Chemical Engineering, McGill University, 3610 University St., Montreal, QC, Canada H3A 2B2.
authors.forename: Marie-Josee
authors.initials: MJ
authors.lastname: Desroches
authors.forename: Sasha
authors.initials: S
authors.lastname: Omanovic
mesh_terms: D000327:Adsorption; D001697:Biomedical and Dental Materials / Q000737:chemistry*; D005340:Fibrinogen / Q000737:chemistry*; D007700:Kinetics; D017433:Protein Structure, Secondary; D013057:Spectrum Analysis / Q000379:methods*; D013193:Stainless Steel / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors
chemical_list: D001697:Biomedical and Dental Materials; D013193:Stainless Steel; D005340:Fibrinogen