Novel Bioactive Antimicrobial Lignin Containing Coatings on Titanium Obtained by Electrophoretic Deposition

Sanja Erakovic, Ana Jankovic, Chi Pong Tsui, Chak Yin Tang, Vesna Miskovic-Stankovic, Tatjana Stevanovic

Research output: Journal article publicationReview articleAcademic researchpeer-review

40 Citations (Scopus)

Abstract

Hydroxyapatite (HAP) is the most suitable biocompatible material for bone implant coatings; its brittleness, however, is a major obstacle, and the reason why research focuses on creating composites with biopolymers. Organosolv lignin (Lig) is used for the production of composite coatings, and these composites were examined in this study. Titanium substrate is a key biomedical material due to its well-known properties, but infections of the implantation site still impose a serious threat. One approach to prevent infection is to improve antimicrobial properties of the coating material. Silver doped hydroxyapatite (Ag/HAP) and HAP coatings on titanium were obtained by an electrophoretic deposition method in order to control deposited coating mass and morphology by varying applied voltage and deposition time. The effect of lignin on microstructure, morphology and thermal behavior of biocomposite coatings was investigated. The results showed that higher lignin concentrations protect the HAP lattice during sintering, improving coating stability. The corrosion stability was evaluated in simulated body fluid (SBF) at 37 °C. Newly formed plate-shaped carbonate-HAP was detected, indicating enhanced bioactive performance. The antimicrobial efficiency of Ag/HAP/Lig was confirmed by its higher reduction of bacteria Staphylococcus aureus TL (S. aureus TL) than of HAP/Lig coating. Cytotoxicity assay revealed that both coatings can be classified as non-toxic against healthy immunocompetent peripheral blood mononuclear cells (PBMC).
Original languageEnglish
Pages (from-to)12294-12322
Number of pages29
JournalInternational Journal of Molecular Sciences
Volume15
Issue number7
DOIs
Publication statusPublished - 11 Jul 2014

Keywords

  • Antimicrobial activity
  • Bioactivity
  • Cytotoxicity
  • Electrophoretic deposition
  • Hydroxyapatite
  • Organosolv lignin
  • SBF
  • Silver
  • Titanium

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Computer Science Applications
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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