Baicalein-modified hydroxyapatite nanoparticles and coatings with antibacterial and antioxidant properties
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AbstractAseptic loosening and bacterial infections are the two main causes of failure for metallic implants used for joint replacement. A coating that is both bioactive and possesses antimicrobial properties may address such shortcomings and improve the performance of the implant. We have sought to study the properties of combining hydroxyapatite-based nanoparticles or coatings with baicalein, a plant-extracted molecule with both antibacterial and antioxidant properties. (B-type) carbonated hydroxyapatite nanoparticles prepared by a chemical wet method could subsequently adsorbed by soaking in a baicalein solution. The amount of adsorbed baicalein was determined to be 63 mg.g−1 by thermogravimetric measurements. In a second approach, baicalein was adsorbed on a biomimetic calcium-deficient hydroxyapatite planar coating (12 μm thick) deposited on Ti6Al4V alloy from an aqueous solution of calcium, phosphate, sodium and magnesium salts. Soaking of the hydroxyapatite coated on titanium alloy in a baicalein solution induced partial dissolution/remodeling of the upper surface of the coating. However, the observed remodeling of the surface was much more pronounced in the presence of a baicalein solution, compared to pure water. The presence of adsorbed baicalein on the HAp layer, although it could not be precisely quantified, was assessed by XPS and fluorescence analysis. Planar coatings exhibited significant antibacterial properties against Staphylococcus epidermidis. Baicalein-modified nanoparticles exhibited significant antioxidant properties. These results illustrate the potential of hydroxyapatite used as a carrier for natural biologically-active molecules and also discuss the challenges associated with their applications as antibacterial agents.
Acceptance Date17/09/2020
All Author(s) ListPalierse Estelle, Hélary Christophe, Krafft Jean-Marc, Génois Isabelle, Masse Sylvie, Laurent Guillaume, Alvarez Echazu MariaI., Selmane Mohamed, Casale Sandra, Valentin Laetitia, Miche Antoine, Chan Ben C.L., Lau Clara B.S., Ip Margaret, Desimone MartinF., Coradin Thibaud, Jolivalt Claude
Journal nameMaterials Science and Engineering: C
Volume Number118
LanguagesEnglish-United Kingdom
KeywordsTitanium alloy, Hydroxyapatite, Baicalein, Antibacterial activity, Antioxidant properties

Last updated on 2021-10-06 at 00:10