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. 2023 Mar 31;12(4):536. doi: 10.3390/biology12040536

Figure 3.

Figure 3

(A) Fourier transform infrared (FT-IR) spectrum of poly(ε-caprolactone) (PCL) samples. The black arrow indicates that there was no interaction in the ester group between the unsterilized PCL (blue line) and sterilized PCL (red line) samples. (B) FT-IR spectrum of PCL compounded with beta-tricalcium phosphate 20% (PCL+β-TCP 20%) samples. The green arrows indicate the interactions in the ester group between the unsterilized composite (blue line) and the sterilized composite (red line) samples.