Figure 2.

Inhibition of vitamin C oxidation by Aptamin C. A, Isothermal calorimetry. ITC of Aptamin Cb, Cf, and Ck binding to vitamin C. The binding affinity of Aptamin Cb is 2.13 µmol/L, Aptamin Cf is 0.89 µmol/L, and Aptamin Ck is 0.90 µmol/L. B, Comparison of OPDA assay according to the concentration of Aptamin C. Aptamin C concentrations are represented as ● (0 nmol/L), ■ (125 nmol/L), ▲ (250 nmol/L), ▼ (500 nmol/L), or ◆ (1000 nmol/L). C, Aptamin C prevents vitamin C oxidation for a long period of time