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. 2017 Apr 18;18(4):858. doi: 10.3390/ijms18040858

Figure 2.

Figure 2

(a) Attenuated Total Reflection Fourier Transform Infrared (ATR-FT-IR) absorption spectra of the (1) Alginate (AL), (2) AL/Hydroxyapatite (HA), and (3) AL/HA/Silk fibroin (SF) beads (* indicates the absorption band of HA composition); (b,c) the infrared absorption and second derivative spectrum of the amide I of the composited SF.