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Guaiacol (/ ˈ ɡ w aɪ ə k ɒ l /) is an organic compound with the formula C 6 H 4 (OH)(OCH 3). It is a phenolic compound containing a methoxy functional group. Guaiacol appears as a viscous colorless oil, although aged or impure samples are often yellowish. It occurs widely in nature and is a common product of the pyrolysis of wood. [3]
Lignin is a class of complex organic polymers that form key structural materials in the support tissues of ... The main flavor compounds of smoked ham are guaiacol ...
It is a colorless solid, although typical samples are brown owing to air-oxidized impurities. Together with guaiacol, syringol and its derivatives are produced by the pyrolysis of lignin. Specifically, syringol is derived from the thermal decomposition of the sinapyl alcohol component. As such, syringol is an important component of wood smoke.
Guaiacol is one of the main components of the pheromones that cause locust swarming. [67] Orcinol has been detected in the "toxic glue" of the ant species Camponotus saundersi . [ citation needed ] Rhynchophorus ferrugineus (red palm weevil) use 2-methoxy-4-vinylphenol for chemical signaling ( pheromones ). [ 68 ]
Lignin is a polymer with an inert nature that forms the structures of woody plants. The ratio of the three monolignols as well as their linkages varies depending on the plant species. For example, Norway spruce lignin is almost entirely derived from coniferyl alcohol , whereas paracoumaryl alcohol is the main monomer of lignin in grasses . [ 4 ]
It is produced from the lignin, along with many of the other phenolic compounds present in bio-oil. In particular, 4-ethylguaiacol is derived from guaiacyl in the lignin. [ 4 ]
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The inclusion of lignin makes the secondary cell wall less flexible and less permeable to water than the primary cell wall. [4] In addition to making the walls more resistant to degradation, the hydrophobic nature of lignin within these tissues is essential for containing water within the vascular tissues that carry it throughout the plant.