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. 2014 Sep 15;15(9):16270–16283. doi: 10.3390/ijms150916270

Table 2.

Tentative identification of phenolic compounds and their derivatives in the filter cake PLE extracts.

Peak Tentative Identification Molecular Formula Rt (min) [M–H]− cal [M–H]− exp Error (ppm) σ-Value λmax (nm) References
1 Quinic acid C7H12O6 2.1 191.0561 191.0561 0.1 10.4 [21,22]
2 Oxidized hydroxytyrosol C8H8O3 3.9 151.0401 151.0408 5.2 4.2 232, 280 [21,22]
3 Uk 1 C14H20O8 8.0 315.1085 315.1098 −4.0 0.9 284, 354
4 Hydroxytyrosol C8H10O3 8.3 153.0557 153.0568 7.4 13.3 232, 280 [9,17,19,21,22,23,24,25]
5 Uk 2 C17H28O11 8.6 407.1559 407.1595 −8.8 8.2 280, 320
6 Hydroxylated product of the dialdehydic form of decarboxymethyl elenolic acid C9H12O5 9.2 199.0612 199.0625 −6.6 4.2 240 [21,22]
7 Uk 3 C8H8O3 10.5 151.0401 151.0408 −6.8 10.5 240, 280
8 Dialdehydic form of decarboxymethyl elenolic acid C9H12O4 11.0 183.0663 183.0783 −7.0 8.8 240 [21,22,23]
9 Uk 4 C17H20O8 12.0 351.1085 351.1090 −1.2 6.7 233, 288
10 Uk 5 C16H26O10 12.7 377.1453 377.1457 −6.4 4.2 266
11 Hydroxylated form of elenolic acid I C11H14O7 13.8 257.0667 257.0687 −8.0 1.4 240 [21,22,25]
12 Elenolic acid C11H14O6 15.2 241.0718 241.0740 −9.1 3.0 240 [9,21,22,23,24,25]
13 Hydroxylated form of elenolic acid II C11H14O7 15.7 257. 0667 257.0689 −8.5 1.2 240 [21,22]
14 Decarboxymethyl-oleuropein aglycone C17H20O6 16.3 319.1187 319.1206 −6.0 1.3 230, 280 [9,17,21,22,24,25]
15 Hydroxy-decarboxymethyl oleuropein aglycone C17H20O7 16.9 335.1136 335.1170 −9.2 1.1 230, 280 [9,21,22,24,25]
16 Uk 6 C19H24O7 18.2 363.1449 363.1466 −4.6 8.4 255
17 Decarboxymethyl-ligstroside aglycone C17H20O5 19.3 303.1238 303.1238 0.0 20.5 230, 280 [17,21,22,24,25,26]
18 Hydroxy-decarboxymethyl-ligstroside aglycone C17H20O6 19.6 319.1187 319.1195 −2.4 3.7 230, 280 [21,22,23,24]
19 Uk 7 C25H28O13 20.1 535.1457 535.1463 −1.1 3.9 277, 330
20 Uk 8 C42H74O10 20.6 737.5209 737.5219 −1.4 29.9 331
21 10-Hydroxy-oleuropein aglycone C19H22O9 22.7 393.1191 393.1216 −6.3 4.7 236, 282 [9,21,24]
22 Luteolin C15H10O6 23.8 285.0405 285.0420 −5.4 2.0 254, 348 [9,17,21,22,23,24,25]
23 Oleuropein aglycone or isomer C19H22O8 24.1 377.1242 377.1249 −2.5 0.3 236, 282 [9,17,21,22,23,24,25]
24 Uk 9 C21H26O9 24.7 421.1504 421.1539 −8.2 10.6 255
25 Apigenin C15H10O5 25.6 269.0455 269.0480 −9.0 12.5 268, 338 [9,17,21,22,23,24,25]

Unknown compounds (Uk).