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Surface Functionalization of TiO2 With an Albumin-Teicoplanin Complex to Prevent Implant-Associated Infections
Chitra Jagannathan1, Jason P Mansell1
1School of Applied Sciences, College of Health, Science and Society, University of the West of England, Bristol, UK.
Journal of Biomedical Materials Research. Part A
|November 27, 2025
Summary
Directly coating titanium dioxide with an albumin-teicoplanin complex creates a stable, antibacterial orthopedic implant surface. This novel method prevents infection and implant failure, even after physiological conditioning.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Infectious Disease
Background:
- Postoperative infections and aseptic loosening are primary causes of orthopedic implant failure, often requiring revision surgery.
- Teicoplanin (TP) is an antibiotic effective against MRSA, and albumin (AB) is a biocompatible carrier.
- Previous implant coating methods using adhesive layers showed limited antibiotic retention.
Purpose of the Study:
- To develop a stable antibacterial surface coating for titanium dioxide (TiO2) using a direct albumin-teicoplanin (AB-TP) complex.
- To assess the coating's stability and efficacy after physiological conditioning, particularly phosphate exposure.
- To evaluate the biological response of osteoblast-like cells to the AB-TP coating.
Main Methods:
- Prepared and immobilized AB-TP complex onto TiO2 powder.
- Assessed AB attachment and stability using BCA assay after incubation, washes, and 7-day conditioning.
- Evaluated in vitro antibacterial efficacy against S. aureus via viable counts and disk diffusion.
- Assessed TP leaching and MG63 cell response (cytocompatibility, alkaline phosphatase activity).
Main Results:
- Albumin demonstrated rapid, irreversible binding to TiO2 with negligible protein loss.
- AB-TP-TiO2 completely inhibited bacterial growth (6.18-log reduction) and retained significant activity (3.3-log reduction) after phosphate conditioning.
- Disk diffusion showed no TP leaching from AB-TP-TiO2, unlike TP-TiO2 which lost antibacterial function.
- MG63 cells showed supported growth and increased alkaline phosphatase activity with AB-TP treatment.
Conclusions:
- Direct functionalization of TiO2 with AB-TP creates a stable, durable antibacterial surface resistant to physiological conditions.
- This method overcomes limitations of previous adhesive layer approaches for implant coatings.
- The AB-TP-TiO2 coating shows potential for preventing orthopedic implant infections and improving outcomes.
