Summary
Antioxidant activity in lard was exhibited by all phenols which had electron-repelling groups in the 2 and 6 positions. No activity was shown by those which had electron-attracting groups in these positions.
The mechanism of antioxidant action of alkyl phenols in lard does not appear to differ from that of di- or polyphenols. A free phenolic group was shown to be essential, and spectral absorption studies after autoxidation did not reveal any evidence for a dimer of the alkyl phenol. The dimer, stilbene quinone, reported isolated from oxidized petroleum oil, disappeared quite rapidly when added to oxidizing lard.
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Journal Paper No. 980 of the Agricultural Experiment Station, Purdue University, Lafayette, Ind.
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Miller, G.J., Quackenbush, F.W. Antioxidant activity of phenols as related to effects of substituent groups. J Am Oil Chem Soc 34, 404–407 (1957). https://doi.org/10.1007/BF02637893
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DOI: https://doi.org/10.1007/BF02637893