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Linear regression equation for polyphenol compounds.
| Types of compounds | Linear regression equation | R 2 | Detection limit (ng/mL) | Precision RSD (%) | Repeatability RSD (%) | Content (mg/g) |
|---|---|---|---|---|---|---|
| Gallic acid | y = 13.133x − 7.4047 | 0.9983 | 0.25 | 0.12 | 0.68 | 90.555 |
| Catechin | y = 8.5179x − 2.0695 | 0.9977 | 0.25 | 0.14 | 1.21 | 552.300 |
| Hyperoside | y = 1.4453x + 0.3967 | 0.9935 | 0.30 | 0.20 | 0.87 | 47.565 |
| Sulfuretin | y = 2.4597x + 0.1246 | 0.9992 | 0.25 | 0.16 | 0.44 | 19.980 |
