Modulated-Diameter Zirconia Nanotubes for Controlled Drug Release-Bye to the Burst

Area of Science:

• Biomaterials Science
• Nanotechnology
• Orthopedic Engineering

Background:

• Orthopedic implant success relies on surface properties and drug delivery capabilities.
• Zirconia nanotubes (ZrNTs) offer potential for improved implant fixation and interaction with the extracellular matrix (ECM).
• Controlling drug release kinetics from ZrNTs coatings is crucial for effective therapeutic outcomes.

Purpose of the Study:

• To develop a novel method for extending drug release duration and minimizing burst release from ZrNTs.
• To investigate the impact of structural modification on the drug release performance of ZrNTs coatings.
• To explore the potential of ZrNTs as adaptable drug delivery systems for orthopedic applications.

Main Methods:

• Fabrication of a double-layered ZrNTs structure with modulated diameter via electrochemical anodization (varying voltage and time).
• Characterization of structurally modified and homogenous ZrNTs using Scanning Electron Microscopy (SEM) and Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS).
• Monitoring and comparison of drug release profiles using UV-Vis spectroscopy.

Main Results:

• Demonstrated a novel and simple approach to extend drug release time from ZrNTs.
• Achieved a significant reduction in the initial burst release phenomenon.
• Confirmed enhanced overall drug release performance through structural modification.

Conclusions:

• Simple structural modification of ZrNTs can significantly improve drug release performance.
• The developed double-layered ZrNTs offer enhanced drug delivery capabilities for orthopedic implants.
• This approach provides a flexible platform for designing smart biomaterials based on metal oxide nanostructures for specific implant challenges.