Table 2.
Spectral (UV and ESI-MS/MS), chromatographic data of compounds 1–14, detected in C. bergamia juices from “fantastico,” “femminello,” and “castagnaro” cultivars.a
| Peak | Compound | t R (min) | [M−H]− | MS/MS base peak | MS/MS ions (m/z) | λ max (nm) |
|---|---|---|---|---|---|---|
| Organic acids | ||||||
| 1 | Citric acid | 2.74 | 191 | 111 | 129, 173, 87 | 210 |
|
| ||||||
| Flavone C-glucoside | ||||||
| 2 | Vicenin-2 | 16.22 | 593 | 473 | 575, 503, 383, 353 | 270, 335 |
| 3 | Lucenin-2 4′-methyl ether | 17.57 | 623 | 503 | 605, 533, 503, 413, 383 | 255, 270, 345 |
|
| ||||||
| Flavanone O-glycosides | ||||||
| 4 | Neoeriocitrin | 19.98 | 595 | 459 | 441, 287, 235, 205 | 285 |
| 8 | Naringin | 22.06 | 579 | 459 | 417, 313, 271 | 280, 330 |
| 9 | Neohesperidin | 22.97 | 609 | 301 | 489, 447 | 285, 330 |
|
| ||||||
| Flavone O-glycosides | ||||||
| 10 | 3-Hydroxy-3-methylglutaryl-neoeriotricin | 23.19 | 739 | 595 | 637, 677, 459 | 285, 325 |
| 11 | Neodiosmin/chrysoeriol 7-O-neohesperidoside | 23.57 | 607 | 250, 280, 330 | ||
|
| ||||||
| 3-Hydroxymethylglutaryl flavanone O-glycosides | ||||||
| 6 | Unidentified | 21.62 | 901 | 757 | 839, 799, 677, 637, 595 | 270, 345 |
| 7 | Unidentified | 21.62 | 885 | 579 | 741, 661, 621 | 265, 345 |
| 12 | Melitidin | 24.47 | 723 | 579 | 661, 621, 579 | 285, 325 |
| 13 | Brutieridin | 24.92 | 753 | 609 | 691, 651, 301 | 285, 325 |
|
| ||||||
| Limonoid glucosides | ||||||
| 5 | Limonin glucoside | 21.41 | 649 | 605 | 461, 443 | 210 |
| 14 | Nomilinic acid glucoside | 25.40 | 711 | 607 | 651 | 210 |
aCompound numbers correspond with peak numbers in Figure 1.