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Precision, repeatability, stability and recovery of five standard substances.
| Standard Substance | Precision RSD (%) (n = 6) | Repeatability RSD (%) (n = 5) | Stability RSD (%) (n = 5) | Recovery (%) (a) (n = 9) Mean RSD (%) | |
|---|---|---|---|---|---|
| Gallic acid | 1.88 | 4.44 | 0.82 | 97.2 | 3.19 |
| Corilagin | 3.25 | 0.63 | 0.54 | 99.5 | 3.77 |
| Methyl brevifolincarboxylate | 4.99 | 4.36 | 1.74 | 98.0 | 4.50 |
| Ellagic acid | 2.80 | 4.39 | 3.28 | 100.3 | 4.42 |
| Rutin | 2.36 | 1.67 | 4.35 | 101.7 | 4.21 |
Recovery (%) = 100 × (amount found-original amount)/amount spiked.
