Triacylglycerols are preferentially oxidized over free fatty acids in heated soybean oil

Author:

Shen QingORCID,Zhang ZhichaoORCID,Emami Shiva,Chen Jianchu,Leite Nobrega de Moura Bell Juliana Maria,Taha Ameer Y.ORCID

Abstract

AbstractIn oil, free fatty acids (FFAs) are thought to be the preferred substrate for lipid oxidation although triacylglycerols (TAGs) are the predominant lipid class. We determined the preferential oxidation substrate (TAGs versus FFAs) in soybean oil heated at 100 °C for 24 h, after validating a method for quantifying esterified and free lipid oxidation products (i.e., oxylipins) with mass-spectrometry. Reaction velocities and turnover (velocity per unit substrate) of FFA, and free and TAG-bound (esterified) oxylipins were determined. FFA hydrolysis rate and turnover were orders of magnitude greater (16-4217 fold) than that of esterified and free oxylipin formation. The velocity and turnover of TAG-bound oxylipins was significantly greater than free oxylipins by 282- and 3-fold, respectively. The results suggest that during heating, TAGs are preferentially oxidized over FFAs, despite the rapid hydrolysis and availability of individual FFAs as substrates for oxidation. TAG-bound oxylipins may serve as better markers of lipid oxidation.

Funder

U.S. Department of Agriculture

Center for Advanced Processing and Packaging Studies

Doctoral Student Joint Training Program Scholarship by Zhejiang University

Publisher

Springer Science and Business Media LLC

Subject

Public Health, Environmental and Occupational Health,Food Science

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