2.4 Fourier Transform Infrared (FTIR) Spectroscopy
The characteristic functional groups of the nanocomposite hydrogels were studied by FTIR. The FTIR spectra of chitosan, PEG, nanocomposite hydrogel with phomopsidione and negative control nanocomposite hydrogel were studied. The analysis was carried out on an FTIR spectrometer (Thermo Scientific Nicolet IS10, USA). The spectra were obtained at room temperature over the range of 4000 cm-1 to 500 cm-1 wave number range.