Table 1.
The validation parameters of the applied methods.
| CUPRAC | FC | DPPH | Nitrates and Nitrites | ||||
|---|---|---|---|---|---|---|---|
| Standard substance | Trolox (TE) | gallic acid (GA) | gallic acid (GA) | sodium nitrite | |||
| Calibration curve equation | y = 17.3x + 0.00234 | y = 0.131x + 0.000874 | y = −0.481x + 0.786 | y = 1.0973x + 0.0037 | |||
| The determination coefficient (R2) | 0.9993 | 0.9991 | 0.9991 | 0.9998 | |||
| Linearity range | 0.0005–0.070 μmol/mL | 0.10–10 μg/mL | 0.13–1 μg/mL | 0.0027–0.6 µg/mL | |||
| LOD | 0.000187 μmol/mL | 0.074 μg/mL | 0.040 μg/mL | 0.009 μg/mL | |||
| LOQ | 0.000562 μmol/mL | 0.22 μg/mL | 0.12 μg/mL | 0.0027 μg/mL | |||
| supplement | lyophilizate | supplement | lyophilizate | gallic acid | supplement | lyophilizate | |
| Precision | 1.7–3.1% | 0.34–1.4% | 1.1–3.9% | 1.1–5.5% | 2.0–4.6% | I stage: 1.26–1.97% II stage: 4.73–4.91% |
I stage: 0.22–4.28% II stage: 2.11–4.95% |
| Recovery | 95–115% | 99–109% | 96–106% | 86–105% | 91–113% | I stage: 86.17–93.47%II stage: 99.06–104.07% | I stage: 80.77–94.08%II stage: 93.99–104.72% |