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https://hdl.handle.net/2142/20147
Description
Title
Lipid oxidation in food and model system
Author(s)
Henson, Lulu Salvador
Issue Date
1990
Doctoral Committee Chair(s)
Siedler, Arthur J.
Department of Study
Food Science and Human Nutrition
Discipline
Food Science
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Food Science and Technology
Chemistry, Agricultural
Language
eng
Abstract
The effect of added iron on lipid oxidation in reheated cooked beef products and the thermal decomposition products of methyl arachidonate were examined. Ferrous acetate was added to beef roasts and steaks at 15 to 300 ppm of iron, cooked, and stored at 3.3$\sp\circ$C for 48 hrs. TBA values and off-flavor scores indicated that iron addition enhanced lipid oxidation. Vacuum packaging was effective in minimizing lipid oxidation in the cooked beef products. The thermal decomposition products of methyl arachidonate (oxidized 48 hrs at 37$\sp\circ$C) were separated by capillary GC and identified by GC/MS. Various aldehydes, ketones, aldehyde esters, hydrocarbons and alcohols were identified. The major products included hexanal, methyl 5-oxopentanoate, pentane, methyl butanoate, and 2,4-decadienal. Odor analysis of the oxidation products by GC effluent sniffing showed 22 regions wherein distinct odors could be detected which consisted of green/grassy, cheesy, mushroom, citrusy, floral, fishy, fatty, waxy, among others. These odors could be important to off-odors and off-flavors developed in oxidized food systems containing arachidonate.
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