Table 2.
Determination and recovery results of ascorbic acid, noradrenaline, uric acid, and tryptophan in a vitamin C tablet, an injection solution of NA, and human urine at DSNPs-GCE.
| Sample | Added (μM) | Found (μM)a | RSD (%) | Recovery (%) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Vitamin C tablet | AA | — | 100 | 200 | 300 | 465.3 | 561.5 | 670.0 | 759.9 | 2.5 | 2.2 | 2.9 | 2.0 | — | 96.2 | 102.3 | 98.2 |
| NA | — | 60 | 80 | 100 | — | 61.2 | 78.5 | 101.5 | — | 2.9 | 2.2 | 2.6 | — | 102.0 | 98.1 | 101.5 | |
| UA | — | 70 | 90 | 110 | — | 68.2 | 89.1 | 112.5 | — | 2.9 | 2.5 | 3.0 | — | 97.4 | 99.0 | 102.3 | |
| Trp | — | 150 | 200 | 250 | — | 146.4 | 203.5 | 244.8 | — | 2.9 | 2.5 | 3.0 | — | 97.6 | 101.8 | 97.9 | |
| Injection solution of NA | AA | — | 500 | 700 | 900 | 505.0 | 710.1 | 887.5 | — | 2.0 | 2.5 | 1.9 | 101.0 | 101.4 | 98.6 | ||
| NA | — | 10 | 20 | 30 | 59.8 | 69.5 | 80.2 | 90.6 | 2.1 | 3.0 | 1.9 | 2.8 | 97.0 | 102.0 | 102.6 | ||
| UA | — | 60 | 85 | 110 | — | 60.4 | 83.9 | 111.1 | — | 2.6 | 3.1 | 2.1 | 100.7 | 98.7 | 110.0 | ||
| Trp | — | 150 | 225 | 300 | — | 152.6 | 222.9 | 296.5 | — | 2.0 | 2.4 | 2.7 | 101.7 | 99.1 | 98.8 | ||
| Urine (human) | AA | — | 500 | 650 | 800 | — | 495.3 | 658.2 | 807.9 | — | 2.7 | 2.4 | 3.0 | 99.1 | 101.3 | 100.9 | |
| NA | — | 70 | 90 | 110 | — | 71.4 | 93.0 | 108.4 | — | 2.8 | 2.3 | 1.8 | 102.0 | 103.3 | 98.5 | ||
| UA | — | 15 | 30 | 45 | 71.2 | 86.6 | 100.8 | 115.1 | 2.8 | 3.1 | 2.2 | 2.6 | 102.7 | 98.7 | 97.6 | ||
| Trp | — | 160 | 240 | 320 | — | 158.5 | 237.0 | 324.1 | — | 2.9 | 2.2 | 2.8 | 99.1 | 98.8 | 101.3 | ||
AA = ascorbic acid; DSNPs-GCE = delphinidin silver nanoparticles modified glassy carbon electrode; NA = noradrenaline; RSD = relative standard deviation; Trp = tryptophan; UA = uric acid.
a
The same sample underwent three replicate measurements.