Fig. 2. Characteristics of vitamin C by voltammetry. (A) Vitamin C produces a concentration-dependent linear increase in peak anodic current (Ipa). (B) The double reciprocal
plot of I
1
pa on concentration1 is linear. (C) The first order derivative of the Ipa also has a linear dependency on concentration. (D) The first order derivative has a linear relation
with the Ipa. (E) From 5.11 lM to 1.02 mM there was no significant change in the potential (Epa) at which the Ipa occurred, only at the highest concentration tested (,
2.56 mM) does the Epa lie significantly more positive (two-way ANOVA and post hoc t-test). (F). For dIpa/dt, there was no significant shift in Epa over a concentration range from
5.11 lM to 1.02 mM, but at 2.56 mM () the rightward shift is statistically significant (p < 0.01) two-way ANOVA and post hoc t-test).