Journal
FOOD CHEMISTRY
Volume 221, Issue -, Pages 1434-1441Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.11.008
Keywords
Frying; Oleic acid; Water content; EPR; SPME-GC-MS/MS, 2, 4-(E,E)-decadienal
Funding
- National Natural Science Foundation of China [31671786]
- Beijing Municipal Science and Technology Project [D151100004015003]
- National Critical Research Grant [2016YFD0401404]
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Promotion of water to the thermal oxidation of oleic acid was detected by the combination of EPR, SPME-GC-MS/MS and GC. Spin-trapping technique was used to identify and quantify the radical species formed during thermal oxidation of oleic acid by using DMPO as electron spin trap. The most abundant radical species were identified as DMPO-alkyl radical adducts. EPR intensity plateau of the samples with 5% water content was 140% higher than the samples without water. It implies oleic acid samples with high water content had high level of oxidation rates. The proportion of aldehydes of the samples with 2% water content was the maximum about 59.97%. Among the formed products, (E,E)-2,4-decadienal has genotoxic and cytotoxic effects, whose percentage was nearly twice comparing with that of 5-0% water content. This study demonstrated that higher water content in frying systems would contribute to seriously oxidation and degradation of oleic acids. (C) 2016 Elsevier Ltd. All rights reserved.
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