The current model of lipid oxidation was established in the mid 1900's.  Since then, improved refining that produces much cleaner oils combined with significant advances in instrumentation that detect products with greater sensitivity and resolution have shown that lipid oxidation mechanisms are more complex than previously proposed.  This study focuses on elucidating alternate pathways beyond hydrogen abstraction in lipid oxidation, using a methyl linoleate model system.  Volatile products were monitored utilizing GC-MS and a variety of sampling techniques including static and dynamic headspace and SPME.  In early oxidation, pentane and products derived from C-13 were the dominant products; hexanal was detected at low levels. C-9 products grew in only with extended secondary oxidation.  Product concentrations cycled rather than continuously accumulating, emphasizing that lipid oxidation is dynamic and products continue to react.  A new integrated scheme showing how multiple pathways are constantly active and competing with one another will be presented.

Alternate pathways beyond hydrogen abstraction in lipid oxidation:   GC studies of volatile products from methyl linoleate

243rd National Meeting (2012)

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