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Chemical structure of LIG, GAN and PEG and proposed cross-linking reactions (A). FTIR spectra of the carbonyl region of of LIG/GAN/PEG hydrogels before (NC) and after the cross-linking process (B). Swelling kinetics of LIG-based hydrogels in PBS (C). Images of all swollen LIG-based hydrogels and the unhydrated LIG10K (n = 3) (D).
