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ATR-FTIR spectra of alginate/chitosan microparticles (a) and alginate/chitosan microparticles after immersing in SBF (b). After immersing in SBF, alginate/chitosan microparticles exhibited the sharp characteristic peaks of the phosphate group (PO43-) (around 1020 (ν3), 960 (ν1), 600 (ν4), and 560 cm-1 (ν4)) and carbonate group (CO32-) (around 1640 (ν3) and 860 cm-1 (ν2)).
