1. XRD patterns of Co-MS-TCP powders prepared by molten salt method with different holding time

2. SEM images of β-TCP powders before and after molten salt treatment with different holding time

3. H₂O₂ scavenging effect of (A) MS-TCP and (B) Co-MS-TCP powders prepared by molten salt method with different holding time

4. XRD patterns of Co-MS-TCP powders prepared by molten salt method with different cobalt salt additions

5. SEM images of Co-MS-TCP powders prepared by molten salt method with different cobalt salt additions

6. Contents and valence state of cobalt in Co-MS-TCP on H₂O₂ scavenging ability

7. Releases of (A) Ca, (B) P and (C) Co ions from β-TCP, MS-TCP and 3% Co-MS-TCP powders in Tris-HCl buffer

8. SEM images of (A₁, A₂) β-TCP, (B₁, B₂) MS-TCP and (C₁, C₂) 3% Co-MS-TCP after soaking in SBF for 7 d and (D) their corresponding FT-IR spectra

9. Cell viabilities of MS-TCP and 3% Co-MS-TCP powders with different concentrations on (A) cartilage cells and (B) bone marrow mesenchymal stem cells

10. Images of intracellular ROS staining fluorescence in cartilage cells stimulated by H₂O₂ treatment with powders (A) Blank, (B) β-TCP, (C) MS-TCP, (D) 3% Co-MS-TCP and (E) corresponding fluorescence intensity statistics

11. Images of intracellular ROS staining fluorescence in bone marrow mesenchymal stem cells stimulated by H₂O₂ treatment with powders (A) Blank, (B) β-TCP, (C) MS-TCP, (D) 3% Co-MS-TCP and (E) Corresponding fluorescence intensity statistics.

12. Calcein AM and PI fluorescence images of cartilage cells treated with different powders((A) Blank; (B) β-TCP; (C) MS-TCP; (D) 3% Co-MS-TCP; (A₁-D₁) Cells without H₂O₂ stimulation; (A₂-D₂) Cells stimulated with H₂O₂ showing live (green) and death (red) cells)

13. Calcein AM and PI fluorescence images of bone marrow mesenchymal stem cells treated with powders (A) Blank; (B) β-TCP; (C) MS-TCP; (D) 3% Co-MS-TCP; (A₁-D₁) Cells without H₂O₂ stimulation; (A₂-D₂) Cells stimulated with H₂O₂ showing live (green) and death (red) cells