Table 1 Phenolic composition of methanol (M), water (Dw) and ethyl acetate (Ea) extracts of A. bracteosa
Classification of phenolic compounds | Retention time | Extracts (mg/g extract) | |||
|---|---|---|---|---|---|
| Â | Ea | Dw | M | ||
Phenols | Hydroquinone | 10.07 | Nd | Nd | Nd |
Pyrocatechol | 12.06 | Nd | 0.071 ± 0.003 | Nd | |
Resorcinol | 17.48 | 0.239 ± 0.01 | 0.196 ± 0.02 | Nd | |
Cinnamic acid derivatives | Caffeic acid | 27.51 | 0.224 ± 0.03 | 0.128 ± 0.01 | 1.496 ± 0.2 |
Chlorogenic acid | 25.80 | 2.032 ± 0.02 | 0.985 ± 0.04 | 3.295 ± 0.4 | |
Ferulic acid | 34.87 | 0.105 ± 0.02 | Nd | Nd | |
p-Coumaric acid | 30.16 | 0.063 ± 0.002 | 0.024 ± 0.002 | 0.121 ± 0.02 | |
Sinapic acid | 50.05 | Nd | 1.059 ± 0.01 | 0.860 ± 0.04 | |
Trans cinnamic acid | 54.44 | Nd | 0.068 ± 0.004 | Nd | |
Benzoic acid derivatives | Gallic acid | 15.24 | 3.495 ± 0.24 | 0.089 ± 0.005 | 1.654 ± 0.2 |
Salicylic acid | 28.21 | Nd | Nd | 0.124 ± 0.01 | |
Vanillic acid | 38.48 | 0.127 ± 0.02 | 0.054 ± 0.003 | Nd | |
Flavonol flavonoid | Kaempferol | 73.06 | 0.103 ± 0.01 | 0.412 ± 0.04 | 0.411 ± 0.03 |
Quercetin | 63.13 | 0.038 ± 0.015 | 0.065 ± 0.005 | 0.220 ± 0.02 | |
flavonol glycoside | Rutin | 58.79 | 0.035 ± 0.003 | 0.076 ± 0.003 | Nd |
Flavan-3-ol flavonoid | Catechin | 23.61 | 0.162 ± 0.02 | 0.203 ± 0.02 | Nd |
Tannin | Ellagic acid | 67.35 | Nd | Nd | Nd |
Miscellaneous | Coumarin | 44.85 | 0.402 ± 0.03 | 0.427 ± 0.03 | 1.689 ± 0.2 |