Table 1.
Calibration curves and the contents of the identified polyphenols obtained from the pomegranate peel extracts by HPLC.
| Component | tR (min) | Linearity (μg/mL) | Regression equation (Y = aX + b) | R2 | Content (mg/100 mg) |
|---|---|---|---|---|---|
| Gallic acid | 9.97 ± 0.09 | 22–110 | Y = 5443X + 422.17 | 0.9991 | 2.53 |
| Punicalagin | 15.22 ± 0.09 22.49 ± 0.08 |
11–500 | Y = 2898X − 1121.61 | 0.9989 | 65.38 |
| Catechin | 26.65 ± 0.05 | 22–110 | Y = 2031X + 447.94 | 0.9992 | 12.66 |
| Chlorogenic acid | 31.53 ± 0.07 | 1.4–110 | Y = 4728X + 156.11 | 0.9993 | 0.37 |
| Caffeic acid | 35.75 ± 0.09 | 0.04–80 | Y = 8734X + 313.97 | 0.9987 | 0.03 |
| Epicatechin | 41.36 ± 0.04 | 2.2–110 | Y = 1684X + 145.86 | 0.9994 | 0.99 |
| Rutin | 68.60 ± 0.06 | 2.8–110 | Y = 1890X + 242.67 | 0.9990 | 0.34 |
| Ellagic acid | 70.86 ± s0.08 | 11–275 | Y = 2491X − 320.39 | 0.9992 | 2.93 |