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. Author manuscript; available in PMC: 2022 Apr 1.
Published in final edited form as: Macromol Chem Phys. 2021 Apr 5;222(7):2170013. doi: 10.1002/macp.202170013

Figure 4.

Figure 4.

Secondary structures of MeOH-annealed silk fibroin films analyzed with FTIR-ATR. β-sheet (1610–1625 cm−1) and random-coil (1640–1650 cm−1) structures are indicated by dashed and solid vertical lines, respectively. FTIR spectral data for 30%, 40%, 50%, and 60% MeOH-annealed silk films. Peak heights corresponding to β-sheet structures increase with greater MeOH-annealing concentrations.