TABLE 3.
Regression equation and linear range of the standard curve of tetramethylpyrazine, ferulic acid, nodakenin, and isoimperatorin.
| Component | Regression equation | r | Linear range (ng/ml) | Detection limit (ng/ml) | Quantitative limit (ng/ml) |
|---|---|---|---|---|---|
| Tetramethylpyrazine | Y= 6,349.80 X + 1,667.90 | 0.9996 | 1.1152–55.7600 | 0.5158 | 1.7193 |
| Ferulic acid | Y = 551.17 X–249.60 | 0.9996 | 6.1840–6,184.0000 | 1.2368 | 4.1227 |
| Nodakenin | Y = 4,196.80 X–8,946.00 | 0.9999 | 1.3152–657.6000 | 0.3425 | 1.1417 |
| Isoimperatorin | Y = 1,072.90 X–2,276.30 | 1.0000 | 1.3820–69.1000 | 2.3000 | 7.6667 |