title: Novel approach to evaluate the oxidation state of vegetable oils using characteristic oxidation indicators.
abstract: Four vegetable oils with typical fatty acid compositions were chosen to determine their indicators of lipid oxidation under the conditions of accelerated oxidation. Good linear correlations were observed between the total nonpolar carbonyl amount and the total oxidation value (TOTOX, R(2) = 0.89-0.97) or peroxide value (POV, R(2) = 0.92-0.97) during 35 days of accelerated oxidation. Additionally, nonanal in camellia oil (oleic acid mainly) increased significantly, and correlated linearly with TOTOX (21.6 TOTOX - 595, R(2) = 0.92); propanal increased significantly in perilla oil (linolenic acid mainly) and correlated linearly with TOTOX (8.10 TOTOX + 75.0, R(2) = 0.90). Hexanal (9.56 TOTOX + 913, R(2) = 0.90, and 7.10 TOTOX + 342, R(2) = 0.78, respectively) and nonenal (10.5 TOTOX + 691, R(2) = 0.95, and 6.65 TOTOX + 276, R(2) = 0.84, respectively) in sunflower oil (linoleic acid mainly) and palm oil (palmitic and oleic acids mainly) also had good linear correlations with TOTOX. Considering the change patterns of these four aldehydes, it was found that the oxidation stability was in the order sunflower oil < camellia oil < perilla oil < palm oil, which was same as POV, TOTOX, and total nonpolar carbonyls. It was concluded that the four aldehydes nonanal, propanal, hexanal, and nonenal could be used as oxidation indicators for the four types of oils.
authors.affiliation: State Key Laboratory of Food Science and Technology and Institute for Advanced Study, Nanchang University , Nanchang 330047, Jiangxi Province, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Cao
authors.forename: Long
authors.initials: L
authors.lastname: Deng
authors.forename: Xue-Mei
authors.initials: XM
authors.lastname: Zhu
authors.forename: Yawei
authors.initials: Y
authors.lastname: Fan
authors.forename: Jiang-Ning
authors.initials: JN
authors.lastname: Hu
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Ze-Yuan
authors.initials: ZY
authors.lastname: Deng
mesh_terms: D000447:Aldehydes / Q000032:analysis*; D015394:Molecular Structure; D010084:Oxidation-Reduction; D010938:Plant Oils / Q000737:chemistry*
chemical_list: D000447:Aldehydes; D010938:Plant Oils; C008664:nonanal; C010463:n-hexanal; C005556:propionaldehyde
keywords: HPLC-QqQ-MS; fatty acid; nonpolar aldehydes/ketones; oil oxidation; oxidation indicator; total oxidation value