Construction of nanophase novel coatings-based titanium for the enhancement of protein adsorption

Abstract

In the recent years, biological nanostructures coatings have been incorporated into orthopedic and dental implants in order to accelerate osseointegration and reducing surgical restrictions. In the present work, chemical etching, anodization and metal doping surfacemodification methodswere integrated in one strategy to fabricate innovative titaniumsurfaces denominated by titanium nanoporous, anodized titanium nanoporous, silver-anodized titanium nanoporous and gold-anodized titanium nanoporous. The stability properties of nanostructures-coated surfaces were elucidated using electrochemical impedance spectroscopy (EIS) after 7 days of immersion in simulated biological fluids. Morphology and chemical compositions of new surfaces were characterized by scanning electron microscope and energy-dispersive X-ray analysis. The EIS results and data fitting to the electrical equivalent circuit model demonstrated the influence of adsorption of bovine serum albumin on new surfaces as a function of protein concentration. Adsorption process was described by the very well-known model of the Langmuir adsorption isotherm. The thermodynamic parameter ΔGADS (-50 to 59 kJ mol-1) is calculated, which supports the instantaneous adsorption of protein from biological fluids to new surfaces and refers to their good biocompatibility. Ultimately, this study explores new surface strategy to gain new implants as a means of improving clinical outcomes of patients undergoing orthopedic surgery.