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Table 3 Some studies reporting guaiacol, vanillin and related compounds in depolymerized lignin

From: RETRACTED ARTICLE: Bacterial conversion of depolymerized Kraft lignin

Substrate Depolymerization method Major monomers References
Steam treated softwood and hemp lignin Base-catalyzed depolymerization Guaiacol, vanillin, catechol [69]
Organosolv lignin Base-catalyzed depolymerization Guaiacol, syringol, syringaldehyde, [70]
Spruce lignin Hydrogenolysis/extraction Ethylguaiacol, propylguaiacol, [71]
Dealkaline lignin Solid acid catalysts Vanillin, guaiacyl acetone, homovanillic acid [72]
Birch wood lignin Hydrogenolysis with Ni-based catalysts Propyl guaiacol and propyl syringol [73]
Organosolv switchgrass lignin Depolymerization and hydrodeoxygenation with formic acid and Pt/C Guaiacol, 4-methylguaiacol, homovanillyl alcohol [74]
Organosolv hardwood lignin Depolymerization in supercritical carbon dioxide/acetone/water fluid Guaiacol, 2-methoxy-4-methyl-phenol, syringol [75]
Kraft lignin Oxidation in aqueous methanol at acidic pH Vanillin, methyl vanillate [76]
Kraft lignin (Indulin AT) Base (NaOH) catalyzed depolymerization at 220 °C Guaiacol, vanillin, acetovanillone, vanillate, 4-hydroxybenzoate This study