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(a) Swelling kinetics and (b) swelling ratio and weight loss at equilibrium (at 24 h) of CO-loaded CS/OP hydrogels. PBS solutions with pH 5.5 were used in all of the experiments (at 32 °C) and each point represents the average of the results from three different samples (n = 3). * p < 0.05, ** p < 0.01, **** p < 0.0001, between samples.
