Table 2.
HPLC analysis of ethanolic poplar, birch, pine buds and propolis extracts (mg/g). Results expressed as mean and standard deviation (SD) of three measurements.
| Poplar mg/g | Birch mg/g | Pine mg/g | Propolis mg/g | |
|---|---|---|---|---|
| Salicin | 0.556 ± 0.046 | - | - | - |
| Chlorogenic acid | 0.051 ± 0.005 | - | - | - |
| Apigenin | 0.792 ± 0.065 | 1.030 ± 0.065 | - | 0.370 ± 0.037 |
| Caffeic acid | 0.828 ± 0.040 | - | 0.006 ± 0.0005 | 0.428 ± 0.020 |
| P-coumaric acid | 12.696 ± 0.366 | 1.167 ± 0.078 | 0.084 ± 0.010 | 15.776 ± 0.410 |
| Cinnamic acid | 8.866 ± 0.167 | 0.097 ± 0.009 | 0.015 ± 0.001 | 0.191 ± 0.009 |
| Pinobanksin | 0.314 ± 0.025 | 0.194 ± 0.012 | 0.009 ± 0.001 | 0.315 ± 0.017 |
| Pinocembrin | 1.263 ± 0.049 | 4.940 ± 0.125 | 0.153 ± 0.005 | 0.509 ± 0.030 |
| Galangin | 6.396 ± 0.110 | - | - | - |
| Vanillin | - | - | - | 4.980 ± 0.163 |
| Vanillic acid | - | - | 0.010 ± 0.001 | 0.176 ± 0.017 |
| Ferulic acid | - | - | 0.069 ± 0.002 | 7.479 ± 0.227 |
| Neochlorogenic acid | - | 0.078 ± 0.007 | - | - |
| Quercetin | - | 0.525 ± 0.063 | 0.010 ± 0.0003 | - |
| Kaempferol | - | 1.526 ± 0.076 | 0.016 ± 0.001 | - |
| Total Phenolic Acids, mg/g | Total Flavonoids, mg/g | Total Identified Active Compounds, mg/g | ||
| Poplar | 22.441 | 8.765 | 31.762 | |
| Birch | 1.342 | 8.215 | 9.557 | |
| Pine | 0.184 | 0.188 | 0.372 | |
| Propolis | 24.050 | 1.194 | 30.224 | |