The bioactivity of the tested materials was assessed by immersion in the SBF solution for 4 weeks, followed by a qualitative and quantitative analysis of their surface using the SEM/EDX technique. Figure shows the SEM images of the analysed surfaces. As can be seen, nucleation and growth of mineral clusters, similar to the mineral fraction of bone, occurs on all surface examined. EDX analysis confirmed the presence of calcium, oxygen and phosphorus atoms in quantities corresponding to the structure of hydroxyapatite (Figure -Supplementary Information). These results indicate that all of produced PBS-DLS/HAp composites have good biocompatibility and osteogenic capacity .