Influence of microenvironment on oxidative susceptibility of seafood lipids
1997
Erickson, M.C. | Sista, R.V.
Lipid microenvironment plays a critical role in dictating the susceptibility of lipids to oxidize with triacylglycerols and membrane lipids of channel catfish serving as the major site of oxidation in early and late stages of storage, respectively. Both mincing and abused storage temperatures (-6 degrees C) accelerate the contribution of triacylglycerols to the oxidative process through acceleration of phospholipase activity and subsequent inhibition of phospholipid oxidation. Furthermore, it has been shown that intercellularly distributed ascorbic acid will accelerate oxidation of triacylglycerols while protecting membrane phospholipids. In contrast, intracellularly distributed ascorbic acid did not accelerate oxidation of triacylglycerols but again protected membrane phospholipids. This relationship of antioxidant/lipid proximity to the efficacy of an applied antioxidant needs to be explored further in model systems where oxidant stress is varied. It is advocated that mathematical models of oxidative stability will be strengthened by incorporation of information pertaining to the lipid's microenvironment.
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