*2.8. Infrared Analysis*

Chemical composition of the gelatin scaffolds was assessed by Fourier transform infrared spectroscopy with attenuated total reflectance (FTIR-ATR) using a Nicolet 6700 Thermo Scientific (Waltham, MA, USA) spectrometer equipped with a diamond crystal at a nominal incidence angle of 45◦ and ZnSe lens. Spectra were recorded in the range of 600–4000 cm−<sup>1</sup> at 32 scans with a resolution of 4 cm<sup>−</sup>1.
