Table 1.
Calculated electrode areas (Areal) for SPEs using the Randles–Ševćik equations (Equation (2) for quasi-reversible processes of RuHex, TMPD, and capsaicin and Equation (3) for irreversible processes such as NADH, dopamine, and ascorbic acid; note that dopamine has anodic and cathodic processes but is termed irreversible because of the relative rates of electron transfer and mass transport [31]; recorded at 19.6 °C for each redox probe, with the diffusion coefficient used in the calculation. The %Real, which is the percentage of Areal divided by the Ageo, is also presented (N = 3).
| Electroactive Probe | Electrode Area Randles–Ševćik/cm2 | D/cm2 s−1 | %Real |
|---|---|---|---|
| RuHex | 0.062 | 9.10 × 10−6 | 83.25 |
| NADH | 0.049 | 7.40 × 10−6 | 65.47 |
| Dopamine | 0.090 | 6.74 × 10−6 | 120.18 |
| Capsaicin | 0.093 | 7.03 × 10−6 | 123.74 |
| TMPD | 0.057 | 6.32 × 10−6 | 75.64 |
| Ascorbic acid | 0.109 | 1.42 × 10−6 | 145.65 |