Fig. 3. FTIR original spectra (A) and second-derivative spectra (B) of BSF/TSF blend films with various blend ratios. (a) BSF, (b) 3/1, (c) 1/1, (d) 1/3 and (e) TSF. The peaks were assigned as random coil (R), α-helix (α), β-sheet (β) and turn (T).
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