Figure 3. Narrow-scan FTIR spectra. (A) Narrow-scan FTIR for amide A: The amide A peak of ß-TCP/collagen (1) was clearly detected compared with that of hydroxyapatite/collagen (2). (B) Narrow-scan FTIR for amide I: The amide I peak of ß-TCP/collagen (1) was much higher than that of hydroxyapatite/collagen (2). (C) Phosphate vibration mode of colloidal ß-TCP (1). The phosphate vibration mode of ß-TCP shifted to 1025 cm^–1 (2), clearly indicating that a -P-O-P- polymerization chain was produced in the ß-TCP/collagen composite after being mixed. All data were confirmed with 6 different samples, respectively, for each composite.