2.5.2 Chemical functional group analysis
In order to analyze the characteristic functional groups of the raw
materials such as albumen, SA, gelatin, and the formulated A-SA-Gel
hydrogel, Fourier transform infrared spectroscopy (FTIR) technique was
employed using a Thermo Nicolet AVATAR 370 spectrometer. The spectra
were recorded over the wave number range of 4000–800
cm-1 and the data were analyzed.