Fig. 5
FT-IR characterization of CDLs in the different mechanical conditions: a FT-IR spectra of CDL and b mean amide I/amide II intensity ratio for CDL in the compliant, standard, and stiff mechanical conditions, as well as for collagen (N = 15). c Quantitative estimation of the mean intensity band in the frequency region 3,100–3,600 cm−1 present in FTIR spectra. Asterisk (*) represents statistically significant differences *P < 0.05; **P < 0.01; ***P < 0.001