Figure 5.

FTIR intensity peaks for ^a: control group, ^b: nHAP group, ^c: ChinHAP, ^d: MS-nHAP. Intensity values ratio for the peak in area of 900–1200 cm^-1 phosphate band and area of amide I band (1590–1720 cm^-1) was taken for calculating mineral to matrix. Intensity ratio of CO₃ band at 1415 and PO₄ at 1030 subband was used to calculate the Carbonate-to-phosphate ratio (C/P) (hydroxy apatite nanoparticles (nHAP); chitosan+hydroxy apatite nanoparticles (chi-nHAP); mesoporous silica+ hydroxy apatite nanoparticles (MS-nHAP))