Table 2.
Individual phenolic composition of the AP samples, expressed in μg/g.
| Peak No. |
Rt (min) |
UV λmax (nm) |
[M+H]+ (m/z) |
Compound | Subclass | Frozen | Lyophilized |
|---|---|---|---|---|---|---|---|
| 1 | 3.25 | 280 | 333 | Gallic acid-glucoside | Hydroxybenzoic acid | 45.47 ± 0.07 ** | 106.62 ± 0.14 |
| 2 | 10.70 | 280, 520 | 449, 287 | Cyanidin-glucoside | Anthocyanin | 20.29 ± 0.00 ** | 78.47 ± 0.18 |
| 3 | 12.45 | 323 | 355 | 5-Caffeoylquinic acid (Chlorogenic acid) |
Hydroxycinnamic acid | 156.71 ± 0.09 ** | 1173.13 ± 0.19 |
| 4 | 13.09 | 280 | 579, 291 | Procyanidin dimmer | Flavanol | 124.70 ± 0.10 ** | 723.07 ± 0.06 |
| 5 | 13.62 | 322 | 343 | Caffeic acid-glucoside | Hydroxycinnamic acid | 42.10 ± 0.03 ** | 202.74 ± 0.29 |
| 6 | 13.74 | 280 | 291 | Epicatechin | Flavanol | 190.36 ± 0.04 ** | 736.21 ± 0.44 |
| 7 | 14.23 | 316 | 339 | p-Coumaroylquinic acid | Hydroxycinnamic acid | 45.41 ± 0.01 ** | 222.40 ± 0.04 |
| 8 | 15.53 | 259, 348 | 611, 303 | Quercetin-rutinoside (Rutin) |
Flavonol | 11.85 ± 0.16 ** | 34.66 ± 0.07 |
| 9 | 16.06 | 259, 350 | 465, 303 | Quercetin-glucoside (Isoquercitrin) |
Flavonol | 217.84 ± 0.08 ** | 358.58 ± 0.07 |
| 10 | 16.73 | 260, 348 | 435, 303 | Quercetin-arabinoside (Avicularin) |
Flavonol | 79.68 ± 0.23 ** | 11.58 ± 0.09 |
| 11 | 17.01 | 285 | 569, 275 | Phloretin-xylosyl-glucoside | Dihydrochalcone | 34.61 ± 0.09 ** | 201.59 ± 0.09 |
| 12 | 17.21 | 260, 349 | 551, 303 | Quercetin-(malonyl)-glucoside | Flavonol | 129.17 ± 0.09 ** | 118.88 ± 0.04 |
| 13 | 17.39 | 260, 347 | 449, 303 | Quercetin-rhamnoside (Quercitrin) |
Flavonol | 88.46 ± 0.06 ** | 164.07 ± 0.09 |
| 14 | 18.35 | 287 | 437, 275 | Phloretin-glucoside (Phloridzin) |
Dihydrochalcone | 114.18 ± 0.03 ** | 720.39 ± 0.09 |
| Total Phenolics | 1300.82 ± 0.10 ** | 4952.40 ± 0.08 |
Rt—Retention time; Mean ± SD (n = 2); ** p < 0.01. Frozen values in comparison to lyophilized values for each phenolic acid.