Table 2.
Determination of tartrazine in soft drink samples.
| Sample | Pp-ABSA/ZnO NPs-CPE | HPLC | |||||
|---|---|---|---|---|---|---|---|
|
|
|
||||||
| Added (μM) | Expected (μM) | Found (μM) | Recovery (%) | Expected (μM) | Found (μM) | Recovery (%) | |
| Orange powder | – | 0.045 | 0.047 | ||||
| 1 | 1.045 | 1.115 | 106.7 | 1.047 | 1.08 | 103.1 | |
| 2 | 3.045 | 2.985 | 98.0 | 3.047 | 3.02 | 99.11 | |
| Coolak drink | – | 0.053 | 0.056 | ||||
| 1 | 1.053 | 1.103 | 104.7 | 1.056 | 1.09 | 103.2 | |
| 2 | 3.053 | 3.09 | 101.2 | 3.056 | 3.07 | 100.4 | |
CPE = carbon paste electrode; HPLC = high performance liquid chromatography; NPs = nanoparticles; Pp-ABSA = poly (p-aminobenzenesulfonic acid); ZnO = zinc oxide.