Fig. 1. Pictures of the products isolated and dispersed in PBS (1 mg mL–1) after different oxidation times. (a) Control group 1 (the concentration of KMnO4 and NaIO4 was 0.556 mM and 10.244 mM, respectively, as those in the reported method.); (b) control group 2 (the concentration of KMnO4 and NaIO4 was 1.668 mM and 10.244 mM, respectively); (c) experiment group (the concentration of KMnO4 and NaIO4 was 1.668 and 3.415 mM, respectively).
