Fig. 2
Oxidation of ascorbate catalyzed by Pd nanocrystals. a, b Evolution of UV-vis absorption spectra for 100 μM ascorbate with 50 μg/mL Pd nanocubes (Pd NCs) or Pd concave nanocubes (Pd CNCs) in aqueous solution. c Time-dependent absorbance changes of ascorbate at 265 nm with Pd NCs or Pd CNCs. d Oxygen consumption during oxidation of ascorbate. ESR spectra of 0.1 mM CTPO obtained from samples containing 5 mM ascorbate in the absence and presence of 50 μg/mL Pd nanocrystals at 10 min. e Ascorbic radical production. ESR spectra were collected at 2 min after mixing 5 mM ascorbate with or without 50 μg/mL Pd nanocrystals. f The concentration of H2O2 with ascorbate alone, or the combination of ascorbate and Pd CNCs. The numerical data are expressed as the mean ± standard deviation. Error bars were taken from three parallel experiments (n = 3). P values compared to that of corresponding ascorbate alone treatment were calculated by Student´s t-test: **p < 0.01
