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Schematic representation of the nanocomposite hydrogel (HG) developed by George D, et al. [42]; base polymer formed by chitosan (CS; drawn in blue) cross-linked with dialdehyde cellulose (drawn in black) via Schiff base formation (highlighted in yellow). ZnO nanoparticles marked in green and quercetin (Q; from onion peel waste) marked in purple.
