Table 1.
Tentative identification of phenolic compounds and their derivatives in olive pomace by HPLC-DAD-ESI-TOF/MS.
| Peak | Tentative Identification | Molecular Formula | Rt (min) | m/z |
|---|---|---|---|---|
| 1 | Quinic acid | C7H12O6 | 3.3 | 191.0561 |
| 2 | Oxidized hydroxytyrosol | C8H8O3 | 6.0 | 151.0401 |
| 3 | Unknown 1 | C16H26O11 | 8.3 | 393.1428 |
| 4 | Vanillic acid | C8H8O4 | 10.2 | 167.0350 |
| 5 | Oleoside/secologanoside or isomer 1 | C16H22O11 | 10.5 | 389.1114 |
| 6 | Loganic acid | C16H24O10 | 10.7 | 375.1318 |
| 7 | Unknown 2 | C15H26O9 | 10.8 | 349.1526 |
| 8 | Hydroxytyrosol | C8H10O3 | 11.0 | 153.0557 |
| 9 | Secoiridoid derived | C17H28O11 | 11.2 | 407.1604 |
| 10 | Decarboxylated form of hydroxyl elenolic acid | C10H14O5 | 11.9 | 213.0768 |
| 11 | Hydroxylated product of decarboxymethyl elenolic acid | C9H12O5 | 12.1 | 199.0618 |
| 12 | Unknown 3 | C8H8O3 | 13.5 | 151.0401 |
| 13 | Oleoside/secologanoside or isomer 2 | C16H22O11 | 14.1 | 389.1089 |
| 14 | Unknown 4 | C9H12O4 | 14.3 | 183.0663 |
| 15 | Unknown 5 | C16H26O10 | 16.3 | 377.1493 |
| 16 | Hydroxy oleuropein | C25H32O14 | 17.0 | 555.1719 |
| 17 | Demethyl oleuropein | C24H30O13 | 17.5 | 525.1614 |
| 18 | Aldehydic form of decarboxymethyl elenolic acid | C10H16O5 | 18.2 | 215.0925 |
| 19 | Luteolin-7-O-rutinoside | C27H30O15 | 19.5 | 593.1510 |
| 20 | Unknown 6 | C36H42O14 | 19.6 | 685.2469 |
| 21 | Luteolin-7-glucoside | C21H20O11 | 20.1 | 447.0933 |
| 22 | Unknown 7 | C38H26O8 | 21.1 | 609.1555 |
| 23 | Unknown 8 | C38H26O6 | 21.9 | 577.1657 |
| 24 | Oleuropein | C25H32O13 | 22.9 | 539.1770 |
| 25 | Luteolin-7-glucoside or isomer | C21H20O11 | 20.1 | 447.0933 |
| 26 | Pinoresinol | C20H22O6 | 24.0 | 357.1344 |
| 27 | Acetoxypinoresinol | C22H24O8 | 24.5 | 415.1390 |
| 28 | Unknown 9 | C31H36O11 | 25.3 | 583.2123 |
| 29 | Unknown 10 | C31H36O12 | 25.6 | 583.2123 |
| 30 | Ligstroside | C25H32O12 | 26.3 | 523.1821 |
| 31 | Naringenin (Internal standard) | C15H12O5 | 28.9 | 271.0893 |
| 32 | Luteolin | C15H10O6 | 30.1 | 285.0405 |
| 33 | Apigenin | C15H10O5 | 31.7 | 269.0451 |