Caused by the air oxygen, the color of the condensate turned to dark brown over time due to autoxidation
of aromatic compounds, as seen with phenolic derivatives forming polymeric molecules (Kuschk et al.
Musso and Rathjen  described five autoxidation
products of 2,5-dimethylresorcinol and 5-methylresorcinol corresponding to dimeric monoquinones marked X and Y dimeric rq, dimeric diquinones marked X and Y dimeric qq, and the trimeric diquinone X trimeric rq.
Marklund, Involvement of the superoxide anion radical in the autoxidation
of pyrogallol and a convenient assay for superoxide dismutase, Eur J Biochem, 47(3):469-74 (1974).
By preserving the unsaturation derived from the bio-based compounds, the polymers could be crosslinked into insoluble coatings by autoxidation
8) A previous report demonstrated thiamine quenching of superoxide generated by pyrogallol autoxidation
Hydroperoxide initiate autoxidation
of lipid by attacking on the double bond in fatty acids and subsequently produce carbonyl compounds.
Involvement of the superoxide anion radical in the autoxidation
of pyrogallol and a convenient assay for superoxide dismutase.
While terpenes dominated the emissions (>95%) of chips and fresh powder, aldehydes from autoxidation
of fatty acids appeared after technical drying.
Peroxyacetic acid or peracetic acid (PAA) is a colorless liquid that is formed by the reaction of acetic acid with hydrogen peroxide or by the autoxidation
The activity of SOD was determined by measuring the inhibition of autoxidation
of epinephrine in pH 10.
Observations on the rate of autoxidation
Antioxidants inhibit the autoxidation
of substances by intervening in reactions of free radicals.