کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1206351 1493710 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Quantitative determination of epoxy acids, keto acids and hydroxy acids formed in fats and oils at frying temperatures
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Quantitative determination of epoxy acids, keto acids and hydroxy acids formed in fats and oils at frying temperatures
چکیده انگلیسی

A method based on derivatization to fatty acid methyl esters and GC is proposed for the quantitative analysis of hydroxy acids, keto acids and epoxy acids in fats and oils. Isolation of the analytes by solid-phase extraction is proposed to prevent analytical interferences caused by non-altered fatty acids naturally occurring in oils. In addition, hydrogenation is required before the GC analysis to improve repeatability. The analytical method was applied to thermoxidized samples of high linoleic sunflower oil, high oleic sunflower oil and high palmitic sunflower oil. Results showed total levels of these compounds in the order of mg/g of oil in samples with contents of polar compounds ranging from 6.7 to 25.7%. The compounds analyzed constituted major fractions of the oxidized fatty acids.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1211, Issues 1–2, 21 November 2008, Pages 129–134
نویسندگان
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