Table 1.
Phenolic compounds identified in ethanol-based E. alba extracts prepared from leaves dried at four different temperatures.
| Phenolic compound | Retention time (min) | Concentration mg/kg in E. alba leaves dried at 10°C | Concentration mg/kg in E. alba leaves dried at 30°C | Concentration mg/kg in E. alba leaves dried at 50°C | Concentration mg/kg in E. alba leaves dried at 100°C |
|---|---|---|---|---|---|
| Chlorogenic acid | 2.880 | 1292.67 | 1334.38 | 619.94 | 217.13 |
| p-Coumeric acid | 3.075 | 896.99 | 1119.93 | 413.21 | 203.87 |
| Gallic acid | 3.342 | 653.10 | 784.38 | 342.34 | 112.1 |
| HB acid | 6.759 | ND | 47.54 | ND | ND |
| Caffeic acid | 7.494 | 14.066 | 21.33 | ND | ND |
| Vanillic acid | 7.687 | ND | 12.86 | ND | ND |
| Kaempferol | 11.074 | 4.08 | ND | ND | ND |
| Sinapic acid | 12.237 | 133.35 | 187.15 | 34.74 | 23.14 |
| Ferulic acid | 12.460 | 85.63 | 104.17 | 67.11 | ND |
| Salicylic acid | 15.296 | 158.63 | 300.70 | ND | 8.13 |
| Coumarin | 16.085 | 162.38 | 1077.39 | 132.7 | ND |
| Quercetin | 16.954 | 196.63 | 210.33 | 100.15 | 54.1 |
| Benzoic acid | 18.306 | 8.670 | 9.10 | 2.83 | ND |
| Rutin | 23.989 | 10.10 | 15.43 | ND | 12.16 |