Figure 2.

(A) Fourier transform infrared spectroscopy spectra of chondroitin-4-sulfate (CS) and the gelatin samples modified with varying concentrations of CS (0%–1.25% (w/v)); (B) the absorption peak ratios of the S=O stretching to N–H stretching bands (A₁₂₂₈/A₃₂₉₄) and C–O stretching to N–H stretching bands (A₁₄₀₃/A₃₂₉₄) for the gelatin samples modified with varying concentrations of CS (GCS000, GCS005, GCS025, and GCS125).

Notes: Values are mean plus or minus standard deviation (n = 3); *P < 0.05 versus all groups (compared only within A₁₂₂₈/A₃₂₉₄ or A₁₄₀₃/A₃₂₉₄ groups); scaffold groups labeled according to CS concentration used (0%, 0.05%, 0.25%, or 1.25% (w/v)): GCS000, GCS005, GCS025, and GCS125.

Abbreviation: A/A, absorbance/absorbance.