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The regression data and linear range for six bioactive compounds analysed by HPLC (n = 6).
| standard solutions | regression equations | R2 | linear range (μg ml−1) |
|---|---|---|---|
| chlorogenic acid | y = 10.69x + 48.25 | R² = 0.9991 | 7.5–100.0 |
| caffeic acid | y = 35.03x − 56.98 | R² = 0.9991 | 2.5–163.0 |
| P-coumaric acid | y = 21.53x − 76.26 | R² = 0.9993 | 1.5–200.0 |
| cichoric acid | y = 29.75x + 23.08 | R² = 0.9990 | 75.0–525.0 |
| luteolin | y = 91.02x − 28.30 | R² = 0.9997 | 2.0–175.0 |
| apigenin | y = 22.08x + 49.15 | R² = 0.9996 | 1.6–87.50 |
