Adsorption Behavior of Lysozyme at Titanium Oxide-Water Interfaces

Area of Science:

• Materials Science
• Surface Chemistry
• Biophysics

Background:

• Understanding protein adsorption on material surfaces is crucial for biomedical applications.
• Titanium oxide is a widely used biomaterial, but its interaction with proteins requires detailed investigation.
• Lysozyme serves as a model protein to study adsorption phenomena.

Purpose of the Study:

• To investigate the in situ adsorption behavior of lysozyme on titanium oxide layers.
• To determine the influence of thermodynamic parameters (temperature, pressure, pH) on protein adsorption.
• To examine the effect of titanium oxide layer thickness on lysozyme adsorption.

Main Methods:

• In situ X-ray reflectivity measurements were employed.
• Titanium oxide layers on silicon wafers were used as substrates.
• Adsorption was studied under varying temperature (20-80 °C), hydrostatic pressure (50-5000 bar), and pH (2-12).

Main Results:

• Lysozyme adsorption on titanium oxide was less compared to silicon dioxide.
• Increased titanium oxide layer thickness led to stronger lysozyme adsorption.
• Higher temperatures (up to 80 °C) increased adsorbed lysozyme amounts.
• Surface charge, influenced by pH, critically affected adsorption.
• Increased hydrostatic pressure reduced lysozyme adsorption.

Conclusions:

• Titanium oxide layer thickness and temperature positively correlate with lysozyme adsorption.
• Surface charge interactions play a significant role in lysozyme adsorption on titanium oxide.
• Hydrostatic pressure negatively impacts lysozyme adsorption, suggesting conformational changes or altered surface interactions.