Phosphorylation and biomimetic mineralization of chitosan woodpile porous scaffolds

To improve the porosity and mineralization of chitosan scaffolds, the woodpile architecture of the scaffolds were constructed, which were then modified by surface phosphorylation(PCSW) and biomineralization(BMCW). FTIR results show that phosphate species are conjugated to chitosan molecules. XRD results demonstrate that phosphate crystals form after 24 h of biomineralization, and highly crystallized hydroxyapatites(HA) have been detected after 48 h. SEM show that layers of dense HA crystals deposite on both of the inner and outer surfaces of the scaffolds. The compressive strength and modulus of the BMCW after biomineralization 48 h are (0.54±0.005) MPa and (5.47±0.65) MPa, respectively, indicating that BMCW can be used as a promising material for non-load bearing bone repairs.