Table 1.
Linear relationships between peak area and sample concentration.
| Compound | Linear range (µg/mL) | Regression equation | Slope ± SD | Intercept ± SD | Regression coefficient | LOD (µg/mL) | LOQ (µg/mL) |
|---|---|---|---|---|---|---|---|
| Vitamin C | 0.10–500 | y = 30697x + 46,356 | 31152 ± 421.2 | 46814 ± 628.1 | 0.9985 | 0.07 | 0.095 |
| Gallic acid | 10–1000 | 144.0x + 1513. | 153.5 ± 8.6 | 1531 ± 56.9 | 0.9965 | 4.50 | 9.50 |
| Rutin | 1–500 | y = 2003.x + 19541 | 2039.2 ± 54.7 | 19645 ± 170.5 | 0.9925 | 0.45 | 0.85 |
| Ellagic acid | 1–500 | y = 1774.x + 12259 | 1790.3 ± 45.7 | 12434 ± 164.8 | 0.9986 | 0.40 | 0.95 |