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 surface modification methods were integrated in one strategy to fabricate innovative titanium surfaces 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 DG ADS (-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.

Titanium and Protein Adsorption: An Overview of Mechanisms and Effects of Surface Features

“…Thus, adsorption of positively charged histone was increased. Au and Ag- nanoparticles (NPs) were successfully embedded into the titanium oxide layer by sequential anodization and soaking in NPs precursor solution and it was found that their presence further increases BSA adsorption [ 137 ]. Increased adsorption capability of surfaces with nanonetwork porosity was addressed as result of increased surface area, where pores can easily accommodate BSA and FN [ 133 ].…”