Research Article
Modified Carbon Nanotube Paste Electrode for Voltammetric Determination of Carbidopa, Folic Acid, and Tryptophan
Table 3
The application of FCDCNPE for simultaneous determination of CD, FA, and TRP in urine. All concentrations are in μM ().
| | Spiked (μM) | Found (μM) | Recovery (%) | RSD (%) |
| | CD | FA | TRP | CD | FA | TRP | CD | FA | TRP | CD | FA | TRP | | 0 | 0 | 0 | NDa | ND | ND | — | — | — | — | — | — | | 5.0 | 10.0 | 20.0 | 4.9 | 10.3 | 19.8 | 98.0 | 103.0 | 99.0 | 3.1 | 1.7 | 2.4 | | 10.0 | 15.0 | 30.0 | 10.1 | 14.6 | 30.4 | 101.0 | 97.3 | 101.3 | 2.8 | 2.5 | 2.9 | | 15.0 | 20.0 | 40.0 | 15.5 | 20.2 | 38.9 | 103.3 | 101.0 | 97.2 | 2.9 | 3.3 | 1.6 | | 20.0 | 25.0 | 50.0 | 19.8 | 24.9 | 51.1 | 99.0 | 99.6 | 102.2 | 1.8 | 2.1 | 3.4 |
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aND: not detected.
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