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Fourier transform infrared (FTIR) (A) and near-infrared (NIR) (B) spectra obtained for hydrogels formulations with 3.0%, 5.0% and 7.5% (w/v) gelatin and for concentrations of GTA of 0.0%, 1.0%, 3.0% and 5.0% (w/w). Some relevant peaks are indicated in the spectra for the precise identification (see discussion) of the material functional groups.
