Table 3.
Major phenolic compounds identified in OWWE.
| Compounds | [M-H]− | Main fragments | Areas | References | |
|---|---|---|---|---|---|
| (m/z)a | ESI-MSb | P | M | ||
| Phenolic alcohols | |||||
| Tyrosol | 137 | ID | ID | [3, 14, 27, 28] | |
| Hydroxytyrosol | 153 | ID | ID | [3, 18, 27–29] | |
| Phenolic acids | |||||
| Vanillic acid | 167 | NI | ID | [18, 24] | |
| Sinapic acid | 223 | ID | NI | [22, 23] | |
| Syringic acid | 197 | ID | ID | [3, 22, 23, 30] | |
| Caffeoylquinic acid | 353 | 191 | ID | NI | [24] |
| 3,4,5 Trimethoxybenzoic acid | 211 | NI | ID | [30] | |
| Vanillin | 151 | NI | ID | [23, 24, 27] | |
| Secoiridoids and derivatives | |||||
| 3,4-DHPEA-EDAb | 319 | 227, 183 | ID | NI | [28] |
| ME 3,4 DHPEA-EAb | 409 | ID | NI | [5] | |
| Oleuropein derivatives | 365 | 214, 307 | NI | ID | [5] |
| Ligstroside | 523 | 335, 259 | NI | ID | [20, 23] |
| p-DHPA-EAb | 361 | ID | NI | [28] | |
| Ligstroside derivatives | 337 | 155 | ID | NI | [20] |
| Ligstroside derivatives | 393 | 257, 137 | ID | NI | [20] |
| Elenolic acid | 241 | NI | ID | [15] | |
| 3,4-DHPEA-ACb | 195 | ID | NI | [15] | |
| Hydroxytyrosol glucoside | 315 | 150 | ID | ID | [17] |
| Oleoside | 389 | 209 | ID | NI | [17] |
| Verbascoside | 623 | 526, 277 | ID | ID | [14, 18, 24, 28] |
| Flavonoids | |||||
| Apigenin-7-rutinoside | 577 | NI | ID | [22, 23] | |
| Apigenin-7-glucoside | 477 | NI | ID | [22, 23] | |
| Luteolin | 285 | ID | ID | [20, 22, 23, 28] | |
| Luteolin-7-glucoside | 447 | ID | ID | [18, 23, 24, 28] | |
| Luteolin-7-rutinoside | 593 | NI | ID | [22–24] | |
| Nüzhenide | 685 | ID | NI | [22, 23] | |
| Rutin | 609 | ID | ID | [18, 23, 24] | |
| Lignans | |||||
| 1 Acetoxypinoresinol | 415 | ID | ID | [22] | |
| Pinoresinol | 357 | NI | ID | [22] | |
aMasse/charge, in the negative mode.
ID: identified; NI: not identified.
P: plain/M: mountain.
b3,4-DHPEA-EA: oleuropein aglycon, p-DHPA-EA: ligstroside aglycon, 3,4-DHPEA-EDA: oleuropein aglycon isomer in aldehyde form, ME 3,4 DHPEA-EA: oleuropein aglycon in methyl form, and 3,4-DHPEA-AC: hydroxytyrosol acetate.