Table 3.
Chromatographic and mass spectral information of the phenolics standards.
| Phenolic Compound | Retention Time (min) | Parent Ion [M-H]− | Product Ions (MS/MS) |
|---|---|---|---|
| Apigenin | 6.60 | 269.1 | 151.4, 149.3, 117.2 * |
| Caffeic acid | 2.75 | 179.1 | 135.4 *, 107.3 |
| Chlorogenic acid | 1.72 | 353.2 | 191.5 *, 179.6, 161.5 |
| Kaempferol | 6.66 | 285.3 | 257.6 *, 229.6, 187.5 |
| Naringenin | 6.64 | 271.1 | 177.4, 151.4, 119.3 *, 107.3, 93.2 |
| Quercetin | 6.20 | 301.1 | 273.5, 179.3, 151.4 * |
| Rosmarinic acid | 4.95 | 359.3 | 197.5, 179.5, 161.5 *, 135.4 |
| Syringic acid | 2.62 | 197.0 | 182.5 *, 167.5, 123.2, 95.2 |
* The fragments in bold are the most intense MS/MS fragments and were used for the peak area quantification of each phenolic compound.