Pyrolysis rearranges guaiacols
, catechols, syringols, vanillins, furancarboxaldehydes, isoeugenol, pyrones, acetic acid, formic acid, and other carboxylic acids (Piskorz et al.
Luten JB, Ritskes JM and JM Weseman Determination of phenol, guaiacol
and 4-methylguaiacol in wood smoke and smoked fish products by gas liquid chromatography.
36), (37) In the oxone-treated/water-washed microtomed sections, the relative intensity of both the lignin/hemicellulose methoxy band at 56 ppm and the lignin guaiacol
C-l, C-3, and C-4 position absorptions at 150 ppm to the cellulose absorption bands (C-l, C-4, C-6, and C-2,3,5 positions) is less than for the control sample (Fig.
Phenol and guaiacol
needed higher temperatures to be fully distilled.
antioxidants such as catalase, ascorbate peroxidase, guaiacol
peroxidase, superoxide dismutase (SOD), monodehydroascorbate reductase,
Isolated cell wall peroxidases were assayed using o-dianisidine, guaiacol
at a raised level may cause a burning sensation, the risk to health is very low.
Peroxidase activity was determined colorimetrically using guaiacol
as a substrate (Hammerschmidt et al.
Plasma circulating catechol estrogens are known to be rapidly metabolized by erythrocytic catechol O-methyltransferase to the corresponding guaiacol
estrogens, such as 2-methoxyestrone or 2-methoxyestradiol (7,8).
To minimize the effects of oxidative stress, plant cells have evolved a complex antioxidant system, which is composed of low-molecular mass antioxidants (glutathione, ascorbate and carotenoids) as well as ROS-scavenging enzymes, such as: superoxide dismutase (SOD), calatase (CAT), ascorbate peroxidase (APX), guaiacol
peroxidase (GPX), and glutathione reductase (GR) (Alscher et al.
They used a retrosynthetic approach, trying to piece together Quebecol from readily available precursors, such as derivatives of guaiacol
and mandelic acid.
2% cetyltrimethylammonium bromide in the presence of 10 mM guaiacol