Table 1.
Regression data, limit of detections (LODs) and limit of quantifications (LOQs) for five standard substances.
| Standard Substance | Calibration Equation y = ax + b (a) | R(b) | Linear Range (μg/mL) | LOD (μg/mL) | LOQ (μg/mL) |
|---|---|---|---|---|---|
| Gallic acid | y = 2619.1x – 15.114 | 0.9998 | 7.00–140.00 | 0.01 | 0.035 |
| Corilagin | y = 1338.5x – 66.433 | 1.0000 | 65.00–780.00 | 0.055 | 0.22 |
| Methyl brevifolincarboxylate | y = 4955.2x + 65.426 | 0.9993 | 5.00–40.00 | 0.35 | 1.00 |
| Ellagic acid | y = 2467.0x – 3.9683 | 0.9998 | 10.00–100.00 | 0.10 | 0.25 |
| Rutin | y = 961.98x – 56.558 | 0.9991 | 10.00–160.00 | 0.70 | 2.00 |
(a)
y and x stand for the peak area and the injection quantity (μg) of each standard substance, respectively;
(b)
R = correlation coefficient, n = 6.