Abstract
Coating systems for titanium implants comprising TiO2 nanotubes and Se alloys (Cu2Se-pTNT and Ag2Se-pTNT) were developed in our previous work to prevent bacterial infections at the bone-implant interface. TiO2 nanotubes were grown on a Ti-based material by anodization and Cu2Se or Ag2Se alloys were incorporated by pulse electrodeposition. Preliminary in vitro investigations identified promising antibacterial properties. Two possible mechanisms of antibacterial activity are the release of bactericide metal ions and/or the formation of reactive oxygen species (ROS). In this work, the activity of the Se alloys for both effects was investigated by electrochemical measurements. Cu2Se and Ag2Se alloys were characterized by rotating disk electrode (RDE) measurements to investigate the reaction pathway for the oxygen reduction reaction (ORR) which may lead to peroxide species. RDE measurements, performed at potentials between 0 and − 0.8 V versus Ag/AgCl (sat. KCl) in an isotonic electrolyte (9 g L−1 NaCl, pH 7) at different oxygen partial pressures, showed that both, Cu2Se and Ag2Se, catalyze the two-electron transfer indicative of an indirect ORR with formation of H2O2 as an intermediate product. For comparison, bare Cu and Ag electrodes were also investigated. Under anodic conditions, selenide alloys slowly release antibacterial metal ions in a controllable and healthy amount for the body. The results demonstrate that these coatings can trigger antibacterial activity by two different mechanisms under both reducing and oxidizing conditions.
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The datasets analyzed during the current study are available from the corresponding author on reasonable request.
References
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Acknowledgements
The authors want to thank Voestalpine and Roland Steger for the ICP-MS measurements.
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These investigations were performed with support of the Austrian Science Foundation FFG (Grant 4253627) and the governments of Lower Austria and Upper Austria in the COMET program framework.
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Sun, J., Hämmerle, A., Fafilek, G. et al. Electrochemical investigation for understanding the bactericidal effect of Cu2Se and Ag2Se for biomedical applications. J Appl Electrochem 52, 1–15 (2022). https://doi.org/10.1007/s10800-021-01617-2
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DOI: https://doi.org/10.1007/s10800-021-01617-2