Table 2 Contents of gallic acid and gallic acid ethyl ester
Working Solution | Gallic acid (mg/g) | RSD (%) | Gallic acid ethyl ester (mg/g) | RSD (%) |
|---|---|---|---|---|
Water | 3.26 ± 0.06 | 1.80 | 0.56 ± 0.01 | 1.64 |
Hydrochloric acid buffer | 5.30 ± 0.11 | 2.08 | 0.58 ± 0.01 | 2.15 |
Artificial gastric juice | 5.30 ± 0.02 | 0.33 | 0.56 ± 0.00 | 0.09 |
Phosphate buffer | 0.28 ± 0.00 | 0.11 | 0.50 ± 0.00 | 0.21 |
Artificial intestinal solution | 0.41 ± 0.00 | 1.13 | 0.52 ± 0.00 | 1.00 |