Table 3.
Determination of Foreign Matter, Loss on Drying/Water Content, Total Ash, Ash Insoluble in Hydrochloric Acid, and Sulfate Residue (Mean Values ± SD).
| No. | Herbal tea | Foreign matter [%] | Loss on drying [m/m%]/ water [v/m%] | Total ash [%] | Ash insoluble in HCl [%] |
|---|---|---|---|---|---|
| 1 | Matricariae flos | 1.43 ± 0.09 | 8.54 ± 0.06 | 7.50 ± 0.08 | - |
| 2 | Thymi herba | 3.77 ± 0.15 (stems) | 6.49 ± 0.03 | 9.00 ± 0.22 | 0.96 ± 0.02 |
| 3 | Menthae piperitae folium | 1.67 ± 0.05 (foreign elements) | 9.23 ± 0.12 | 8.93 ± 0.05 | 0.63 ± 0.02 |
| 4 | Uvae ursi folium | 1.20 ± 0.03 (stems) | 8.88 ± 0.20 | 6.64 ± 0.03 | - |
| 5 | Betulae folium | 4.62 ± 0.02 (other foreign matter) | 9.82 ± 0.15 | 4.72 ± 0.08 | - |
| 6 | Althaeae radix | 7.13 ± 0.09 | 9.09 ± 0.09 | 4.99 ± 0.10 (the peeled root) | - |
| 7 | Gentianae radix | 1.15 ± 0.04 | 8.94 ± 0.7 | 4.02 ± 0.03 | - |
| 8 | Glycyrrhizae radix | 1.54 ± 0.05 | 8.79 ± 0.16 | 5.94 ± 0.06 (the unpeeled drug) | 0.96 ± 0.05 (the unpeeled drug) |
| 9 | Frangulae cortex | 0.73 ± 0.03 | 8.99 ± 0.08 | 5.23 ± 0.05 | - |
| 10 | Quercus cortex | 0.27 ± 0.02 | 9.45 ± 0.11 | 7.43 ± 0.15 | - |