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Histograms and photographs depicting the swelling behavior of the CMS hydrogel and the CMS@CuO nanocomposite hydrogels containing 2 wt.% and 4 wt.% CuO nanoparticles. The histogram on the left shows swelling in the presence of different concentrations of citric acid as crosslinking agent (a). The histogram on the right and the photograph above show the antioxidant activity of CMS, CuO nanoparticles and the CMS@CuO nanocomposite hydrogels with 2 wt.% and 4 wt.% CuO nanoparticles (b).
