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The calibration curve and R values of caffeic acid and ferulic acid.
| Standard | Regression equation | R |
| Ferulic acid | y = 645622568x - 223872 | 0.9997 |
| Caffeic acid | y = 294445216x -1399648 | 0.9998 |
Each value is expressed as mean±standard deviation, n = 3.
