*2.5. Physicochemical Characterization*

#### 2.5.1. Fourier Transform Infrared (FTIR) Spectroscopy

Spectrum Two (UATR Two; Perkin Elmer) spectrophotometer with discs of KBr, in the spectral range of 4000–400 cm−1, was used for the FTIR measurements to determine the functional groups of the hydrogels.
