Table 4.
The content of phenolic acids (µg g−1 FW) in bud extracts of Betula pendula. Values are expressed as mean ± SDs (n = 5). Different letters in lines show significant differences (p < 0.05) according to Tukey’s test.
| Betula pendula | |||||
|---|---|---|---|---|---|
| Jičín | Hradec Králové | Opatovice n. Labem | Naděje | Rabštejnská Apatyka |
|
| hydroxycinnamic acids | |||||
| t-caffeic acid | 38.757 ± 0.838 a | 21.769 ± 1.252 c | 27.718 ± 0.972 b | 20.799 ± 0.156 c | 26.975 ± 2.158 b |
| chlorogenic acid | 201.22 ± 15.03 d | 410.96 ± 8.62 b | 128.30 ± 2.64 e | 456.41 ± 3.02 a | 353.76 ± 1.80 c |
| cinnamic acid | 178.128 ± 4.251 a | 117.457 ± 6.243 b | 89.765 ± 2.134 c | 70.220 ± 0.391 d | 78.272 ± 1.954 d |
| p-coumaric acid | 39.871 ± 1.735 a | 22.722 ± 1.283 b | 22.029 ± 1.187 b | 17.334 ± 1.043 c | 17.017 ± 0.648 c |
| ferulic acid | 75.945 ± 2.667 a | 74.336 ± 4.941 a | 81.685 ± 1.084 a | 21.606 ± 2.077 b | 26.939 ± 0.848 b |
| hydroxybenzoic acids | |||||
| protocatechuic acid | 2.148 ± 0.245 c | 2.266 ± 0.155 c | 3.913 ± 0.160 bc | 5.596 ± 1.227 ab | 7.334 ± 1.043 a |
| p-hydroxybenzoic acid | 1.966 ± 0.211 c | 3.039 ± 0.152 b | 4.121 ± 0.531 a | 2.087 ± 0.233 c | 2.769 ± 0.285 bc |
| gallic acid | 35.097 ± 0.516 c | 43.095 ± 1.379 b | 54.992 ± 2.760 a | 12.948 ± 0.271 e | 21.178 ± 1.352 d |
| salicylic acid | 7.326 ± 0.575 c | 10.122 ± 0.235 b | 7.966 ± 0.317 c | 16.354 ± 0.546 a | 15.007 ± 0.899 a |
| syringic acid | 1.252 ± 0.048 a | 1.333 ± 0.046 a | 0.918 ± 0.094 b | 0.561 ± 0.030 c | 0.540 ± 0.024 c |
| vanillic acid | 10.113 ± 0.513 c | 13.578 ± 0.462 b | 15.647 ± 0.447 a | 9.678 ± 0.394 c | 9.296 ± 0.594 c |