USING TOTAL DOUBLE-BOND VALUE OF AN EDIBLE OIL TO PREDICT ITS EFFECT ON PLASMA-LIPIDS

The objective of this study was to investigate the accuracy of using t he total double-bond value (TDV) of edible oil to predict its effect o n the plasma lipid level of rats. The test oils used included fish oil , squid visceral oil (high long chain n-3 PUFA, corn oil, soybean oil (high n-6 PUFA), olive oil, lard (high MUFA) and hydrogenated beef tal low (high SFA, S). Test diets contained 15% of each test oil with the cholesterol level made up to 1%. The results demonstrated that the sum of the percents of each MUFA and PUFA in an oil, multiplied by the nu mber of double bonds in each compound (TDV), may be a better indicator to predict the effects of the oils on plasma lipid metabolism. There was a negative correlation between TDV and plasma total lipids and cho lesterol levels, but the lard group was slightly lower than expected. Using TDV as an indicator for plasma lipid metabolism may not be perfe ct, but is much better than the PIS or P+M/S ratio.