3.4 Chemical functional group analysis
The chemical functional groups of the SA, albumen, Gel, and A-SA-Gel samples were studied by FTIR spectroscopy and the results are depicted in Figure 4A. As seen from the FTIR spectra, the characteristic peaks of SA appear at 1610, 1416, and 1042 cm-1. The characteristic peaks of albumen appear at 1621, 1536, and 1251 cm-1. For the Gel sample, the characteristic peaks were 1661, 1582, 1516, and 1252 cm-1. As for as the A-SA-Gel hydrogel sample, the most prominent peaks are appeared at 1650, 1546, 1455, 1241, and 1021 cm-1 as seen from the spectrum