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. 2024 May 16;13(10):1555. doi: 10.3390/foods13101555

Table 2.

Identified compounds in the analyzed olive oil extracts.

Peak Number Proposed Compound Molecular Formula RT 1
(min)		 m/z
(Exp) 2 		m/z (Theor) 3 Error (ppm) References
1 Oxidized hydroxytyrosol C8H8O3 11.67 151.0421 151.0401 13.2 [44]
2 Hydroxytyrosol C8H10O3 11.83 153.0577 153.0557 12.7 [38,44,49]
3 Dialdehydic form of decarboxy methyl elenolic acid C9H12O4 12.78 183.0669 183.0663 −3.2 [48]
4 Elenolic acid isomer 1 C11H14O6 13.88 241.0713 241.0718 1.8 [48,49]
5 Tyrosol C8H10O2 14.03 137.0626 137.0608 −18.2 [38,44,48,49]
6 Hydroxy D-oleuropein aglycone C17H20O7 16.14 335.1130 335.1136 2 [38,48]
7 10-hydroxy oleuropein aglycone C19H22O9 16.81 393.1181 393.1191 2.6 [48]
8 UK 4 1 C12H16O6 17.68 255.0870 255.0874 1.6 -
9 UK 4 2 C12H16O6 18.30 255.0877 255.0874 1.1 -
10 p-cumaric acid C9H8O3 19.20 163.0426 163.0401 15.7 [49,50]
11 Hydroxytyrosol acetate C10H12O4 19.80 195.0665 195.0663 0.9 [38,48,49]
12 Elenolic acid isomer 2 C11H14O6 21.11 241.0721 241.0718 1.2 [48,49]
13 Oleacein/Decarboxymethyl oleuropein aglycone C17H20O6 22.70 319.1200 319.1187 −4.1 [38,48,49]
14 Oleuropein aglycone isomer 1 C19H22O8 23.43 377.1271 377.1242 −7.8 [38,44,48,49]
15 Oleuropein aglycone isomer 2 C19H22O8 23.95 377.1272 377.1242 −7.8 [38,44,48,49]
16 Oleuropein aglycone isomer 3 C19H22O8 24.37 377.1269 377.1242 −7.2 [38,48,49]
17 Syringaresinol C22H26O8 25.37 417.1558 417.1555 0.8 [48]
18 Pinoresinol C20H22O6 26.14 357.1345 357.1344 0.3 [48,49]
19 Oleocanthal/Decarboxymethyl ligstroside aglycone C17H20O5 26.54 303.1250 303.1238 3.9 [38,48,49]
20 Ligstroside aglycone isomer 1 C19H22O7 27.06 361.1313 361.1293 −5.7 [38,48,49]
21 Ligstroside aglycone isomer 2 C19H22O7 27.40 361.1322 361.1293 −8.2 [38,48,49]
22 Oleuropein aglycone isomer 4 C19H22O8 27.95 377.1258 377.1242 −4.2 [38,49]
23 Oleuropein aglycone isomer 5 C19H22O8 29.35 377.1281 377.1242 −10.3 [38,49]
24 Luteolin C15H10O6 29.79 285.0407 285.0405 −0.9 [44,48,49]
25 Oleuropein aglycone isomer 6 C19H22O7 29.92 377.1272 377.1242 −8.0 [38,49]
26 Ligstroside aglycone isomer 3 C19H22O7 30.59 361.1323 361.1293 −8.4 [38,48,49]
27 Apigenin C15H10O5 31.04 269.0451 269.0455 1.5 [44,48,49]
28 Ligstroside aglycone isomer 4 C19H22O7 31.13 361.1312 361.1293 −5.5 [38]
29 Ligstroside aglycone isomer 5 C19H22O7 32.08 361.1302 361.1293 −2.6 [38]

1 Retention time; 2 Experimental; 3 Theoretical; 4 UK: unknown compound.