Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 67, Issue 24, Pages 6902-6910Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.9b01400
Keywords
autoxidation; antioxidant; peroxyl radicals; kinetics; sunflower oil; squalene; p-cymene
Funding
- MIUR (Rome)
- University of Bologna
- China Scholarship Council (CSC)
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The autoxidation kinetics of stripped sunflower oil (SSO), squalene (SQ), and p-cymene (p-C) initiated by 2,2'-azobis(isobutyronitrile) at 303 K were investigated under controlled conditions by differential oximetry in order to build reference model systems that are representative of the natural variability of oxidizable materials, for quantitative antioxidant testing. Rate constants for oxidative chain propagation (k(p)) and chain termination (2k(t)) and the oxidizability (k(p)/root 2k(t)) were measured using 2,6-di-tert-butyl-4-methoxyphenol, 2,2,5,7,8-pentamethyl-6-chromanol, BHT, and 4-methoxyphenol as reference antioxidants. Measured values of kp (M-1 s(-1))/2k(t) (M-1 s(-1))/oxidizability (M-1/2 s(-1/2)) at 303 K in chlorobenzene were 66.9/3.45 x 10(6)/3.6 x 10(-2), 68.0/7.40 x 10(6)/2.5 x 10(-2), and 0.83/2.87 x 10(6)/4.9 x 10(-4), respectively, for SSO, SQ, and p-C. Quercetin, magnolol, caffeic acid phenethyl ester, and 2,4,6-trimethylphenol were investigated to validate calibrations. The distinctive usefulness of the three substrates in testing antioxidants is discussed.
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