Table 2.
Electrochemical characteristics of carbon paste electrode as sensor for caffeine determination.
| Medium | Electrohemical Sensor | Method | LOD | CV Oxidation Peaks | Linear Range | Real Sample | References |
|---|---|---|---|---|---|---|---|
| 0.01 M H3PO4 | ZMWCNTMCPE/SDS | CV, EIS, SWV, SEM | 7.5∙10−8 M | +1.44 V | 1.0 × 10−5– 5.0 × 10−4 M |
Beverages and pharmaceutical tablets | [78] |
| 0.04 M BR pH 7.2 |
ZnO-Zn2SnO4-SnO2/Gr/CPE | DPV chronoamperometry |
0.00709 µM 0.00385 µM |
/ | 0.02–97.51 µM | Urine and blood serum | [75] |
| 0.01 M H2SO4 pH 0.75 | NCOMCPE/SDS | CV DPV chronoamperometric |
0.016 µM | / | 5–600µM | Beverages and pharamceutical drugs | [77] |
| 0.1 M PBS pH 7 |
CMCPE | CV DPV |
0.036 µM | +1.26 V | 5–80 µM | / | [76] |
| BR buffer pH 3.5 |
CuO-Gr/CPE | CV, DPV | 0.010 mM | / | 0.025–5.3 mmolL−1 | Biological samples | [74] |
| 0.1M PBS pH 4 |
FC/Chi-MWCNTs/MGPE | DPV | 2.05 μM | +1.34 V | 10–2439.02 µM | Human serum and urine | [79] |