Table 3 Calibration curves of phenolic acids and flavonoids
Compound | tR | Calibration Eq. a | Correlation factor, r2b |
|---|---|---|---|
Gallic acid (1) | 4.7 | Y = 22.267X + 67.033 | 0.9992 |
Protocatechuic acid (2) | 6.6 | Y = 25.558X + 76.6 | 1.0000 |
Vanillic acid (3) | 10.2 | Y = 32.097X—129.03 | 0.9992 |
p-Coumaric acid (4) | 17.3 | Y = 33.68X + 128.23 | 0.9998 |
Rutin (5) | 19.4 | Y = 11.017X + 0.2 | 0.9999 |
Ferulic acid (6) | 19.9 | Y = 17.545X + 23.808 | 0.9999 |
Isoquercitrin (7) | 22.1 | Y = 19.87X + 269.63 | 0.9991 |
Astragalin (8) | 26.2 | Y = 23.083X + 73.537 | 0.9999 |
Quercetin (9) | 40.4 | Y = 35.876X + 41.054 | 1.0000 |
Luteolin (10) | 41.0 | Y = 30.651X—15.65 | 0.9996 |
Apigenin (11) | 43.3 | Y = 40.287 X + 72.525 | 1.0000 |
Tricin (12) | 44.2 | Y = 12.367 X + 168.19 | 0.9990 |
Kaempferol (13) | 44.9 | Y = 35.121X + 292.42 | 0.9999 |