title: Kinetics of Forming Aldehydes in Frying Oils and Their Distribution in French Fries Revealed by LC-MS-Based Chemometrics.
abstract: In this study, the kinetics of aldehyde formation in heated frying oils was characterized by 2-hydrazinoquinoline derivatization, liquid chromatography-mass spectrometry (LC-MS) analysis, principal component analysis (PCA), and hierarchical cluster analysis (HCA). The aldehydes contributing to time-dependent separation of heated soybean oil (HSO) in a PCA model were grouped by the HCA into three clusters (A1, A2, and B) on the basis of their kinetics and fatty acid precursors. The increases of 4-hydroxynonenal (4-HNE) and the A2-to-B ratio in HSO were well-correlated with the duration of thermal stress. Chemometric and quantitative analysis of three frying oils (soybean, corn, and canola oils) and French fry extracts further supported the associations between aldehyde profiles and fatty acid precursors and also revealed that the concentrations of pentanal, hexanal, acrolein, and the A2-to-B ratio in French fry extracts were more comparable to their values in the frying oils than other unsaturated aldehydes. All of these results suggest the roles of specific aldehydes or aldehyde clusters as novel markers of the lipid oxidation status for frying oils or fried foods.
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: A Saari
authors.initials: AS
authors.lastname: Csallany
authors.affiliation: National Laboratory for Agriculture and the Environment, USDA , Ames, Iowa 50011, United States.
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Kerr
authors.forename: Gerald C
authors.initials: GC
authors.lastname: Shurson
authors.forename: Chi
authors.initials: C
authors.lastname: Chen
mesh_terms: D000447:Aldehydes / Q000138:chemical synthesis*; D002853:Chromatography, Liquid / Q000379:methods*; D007700:Kinetics; D013058:Mass Spectrometry / Q000379:methods*; D009821:Oils / Q000737:chemistry*; D011198:Solanum tuberosum / Q000737:chemistry*
chemical_list: D000447:Aldehydes; D009821:Oils
keywords: French fries; LC−MS; aldehydes; chemometrics; frying oil