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Pearson’s correlation coefficient between the deacetylation degree (%DD) of chitosan and superoxide radical scavenging activities of α- and β-chitosan nanoparticles at concentration of 0.5 mg/mL (r = 0.477, p < 0.05) (a), 1 mg/mL (r = 0.607, p < 0.01) (b), 2 mg/mL (r = 0.905, p < 0.01) (c) and 3 mg/mL (r = 0.952, p < 0.01) (d).
