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(A) FTIR spectra of the glycerol-plasticized silk films with highlighted amide Ⅰ region. (B) β-sheet contents of the glycerol-plasticized silk films estimated from the deconvolution of the amide I region. Three FTIR spectra were collected for each sample and spectral deconvolution was performed to estimate the β-sheet contents. (C) FTIR spectra of the glycerol-plasticized silk films and glycerol with a spectral region of 800–1150 cm−1.
