Table 2.
Regression, correlation coefficient (r 2), LOD, and LOQ of the marker compounds of OJS.
| Compound | UV wavelength | Regression equation | Linear range (μg/mL) | r 2 | LOD (μg/mL) | LOQ (μg/mL) | |
|---|---|---|---|---|---|---|---|
| Slope | Intercept | ||||||
| Gallic acid | 270 nm | 39,349 | 4,315 | 0.63–5.00 | 0.9995 | 0.015 | 0.047 |
| Protocatechuic acid | 260 nm | 42,285 | 2,576 | 0.31–5.00 | 0.9994 | 0.014 | 0.043 |
| Chlorogenic acid | 325 nm | 32,676 | 9,500 | 1.56–25.00 | 0.9994 | 0.019 | 0.056 |
| Albiflorin | 230 nm | 10,703 | 2,218 | 1.56–25.00 | 0.9998 | 0.057 | 0.172 |
| Paeoniflorin | 230 nm | 15,956 | −377 | 4.69–75.00 | 1.0000 | 0.038 | 0.115 |
| Ferulic acid | 325 nm | 44,533 | 17,050 | 1.56–25.00 | 0.9993 | 0.014 | 0.041 |
| Liquiritin | 275 nm | 24,585 | 12,410 | 4.69–75.00 | 0.9999 | 0.025 | 0.075 |
| Benzoic acid | 230 nm | 38,560 | 11,910 | 1.56–25.00 | 0.9998 | 0.016 | 0.048 |
| Nodakenin | 335 nm | 34,254 | 17,529 | 4.69–75.00 | 0.9999 | 0.018 | 0.054 |
| Hesperidin | 280 nm | 18,406 | 25,320 | 10.94–175.00 | 0.9999 | 0.033 | 0.100 |
| Naringin | 280 nm | 15,468 | 20,566 | 10.94–175.00 | 0.9999 | 0.039 | 0.119 |
| Neohesperidin | 280 nm | 25,094 | 24,132 | 7.81–125.00 | 0.9999 | 0.024 | 0.073 |
| Ononin | 250 nm | 58,807 | 3,317 | 0.31–5.00 | 0.9994 | 0.010 | 0.031 |
| Oxypeucedanin hydrate | 310 nm | 16,087 | 2,865 | 1.56–25.00 | 0.9993 | 0.038 | 0.114 |
| Cinnamic acid | 275 nm | 93,234 | 10,584 | 0.63–10.00 | 0.9998 | 0.007 | 0.020 |
| Byakangelicin | 270 nm | 23,738 | 5,392 | 1.56–25.00 | 0.9994 | 0.026 | 0.077 |
| Cinnamaldehyde | 290 nm | 156,619 | 8,846 | 0.33–5.25 | 0.9996 | 0.004 | 0.012 |
| Benzoylpaeoniflorin | 230 nm | 28,272 | 274 | 0.16–2.50 | 0.9997 | 0.021 | 0.065 |
| Glycyrrhizin | 250 nm | 6,765 | 1,864 | 1.56–25.00 | 0.9993 | 0.090 | 0.272 |