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Hydrogel composites' FTIR spectra. The stretching vibration of -COO ester bonds, C-N stretching, and OH bending cause peaks in the spectra between 1404 and 1500 cm−1. Because of the (N-H) group and hydrogen-bonded hydroxyl group (O-H), a wide band formed at 3220–3334 cm−1. Abbreviations. Xanthan gum (X), boric acid (B), gelatin (Ge), polyethylene glycol (Peg), chitosan (Ch), and glutaraldehyde (G).
