Research Article
Comparisons of Ethanol Extracts of Chinese Propolis (Poplar Type) and Poplar Gums Based on the Antioxidant Activities and Molecular Mechanism
Table 2
Concentration of 11 compounds in EECP and EEPGa.
| | Compounds | Retention Time | EECP | EEPG | | (min) | (g/100 g of extract) | (g/100 g of extract) |
| | Caffeic acid | 17.52 | 0.35 ± 0.00 | — | | p-Coumaric acid | 24.32 | 0.08 ± 0.00 | — | | Ferulic acid | 27.71 | 0.07 ± 0.00 | — | | Resveratrol | 40.53 | — | — | | Quercetin | 46.24 | — | — | | Apigenin | 49.89 | 0.12 ± 0.00 | 0.07 ± 0.00 | | Kaempferol | 50.98 | — | — | | Chrysin | 66.44 | 2.33 ± 0.06 | 0.96 ± 0.02 | | Pinocembrin | 69.10 | 1.22 ± 0.04 | 0.69 ± 0.01 | | Galangin | 70.04 | 1.11 ± 0.05 | 0.65 ± 0.01 | | CAPE | 71.75 | 0.58 ± 0.04 | 0.22 ± 0.00 |
| | Total | | 5.85 ± 0.20 | 2.59 ± 0.05 |
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avalues are expressed as the mean ± SD (); CAPE: caffeic acid phenylethyl ester; —, not detected.
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