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. 2019 Dec 4;5(12):e02910. doi: 10.1016/j.heliyon.2019.e02910

Figure 2.

Figure 2

Py-GC/MC pyrograms of cork, phloem and wood from 6-year-old Quercus suber trees. 1: 2-oxo-propanal; 2: 1-hexene (C6:1); 3: 1-heptene (C7:1); 5: hydroxyacetaldehyde; 6: acetic acid; 7: 1-octene (C8:1); 8: acetol; 9: toluene; 14: 3-hydroxypropanal; 19: CH3–CO–CHOH–CHO; 20: CHO–CH2–CH2–CHO; 22: furfural; 23: 2-cyclopenten-1-one; 31: 2-hydroxy-2-cyclopenten-1-one; 33: 1-undecene (C11:1); 36: Not identified sugar; 42: 4-hydroxy-5,6-dihydro-(2H)-pyran-2-one; 46: methyl-dihydro-(2H)-pyran-2-one; 50: 1-dodecene (C12:1); 55: 6-heptenoic acid (C7:1); 66:octanoic acid (C8:0); 69: 7-octanoic acid (C8:1); 72: 1-tetradecene (C14:1); 75: Not identified sugar; 78: 8-nonenoic acid (C9:1); 80: 1,5-anhydro-arabinofuranose; 81: 2,3-dihydrobenzofuran; 82: 4-vinylguaiacol; 87: 5-hydroxymethylfurfural; 95: 2-hydroxymethyl-5-hydroxy-2,3-dihydro-(4H)-pyran-4-one; 96: trans-isoeugenol; 97: similar to 1,5-anhydro-arabinofuranose; 99: vanillin; 107: 4-vinylsyringol; 121: levoglucosan; 123: syringaldehyde; 126: 1-eicosene (C20:1); 127: 1,19-eicosadiene (C20:2); 130: acetosyringone; 132: trans-coniferaldehyde; 137: 1-heneicosene (C21:2); 140: 1-docosene (C22:1); 142–144: Not identified suberin derivatives.