High-oleic peanut oil

The percentage ranges of triacylglycerol species for Argentine and US samples often overlap however, origin identification was possible through trace element analysis. 

The concentration of phospholipids in peanut oil is only about 1%. This class of compounds has been shown to be synergistic with tocopherols in delaying onset of lipid oxidation. The major phospholipids of peanut oil are phospha-tidic acids (PA), phosphatidylglycerols (PG), phosphatidylethanolamines (PE), phosphatidylinositols (PI), and phosphatidylcholines (PC). The phospholipid content and concentrations have been shown to be affected by maturity and postharvest treatment as shown in Table 8.5 (Singleton and Stikeleather 1995). The higher concentrations of PA and PC in immature peanuts might be explained on the basis that these are precursors of other phospholipids. Both excessive heat 

PA = phosphatidic acid PG = phosphatidylglycerol PE = phosphatidylethanolamine PI = phosphati-dylinositol PC = phosphatidylcholine. 

Peanuts contain -sitosterol, campesterol, stigmasterol, A5-avenasterol, A7-stigmasterol, A7-avenasterol, andbrassicasterol (Table 8.6). These sterols, which are secondary alcohols with 27-29 carbon atoms, are crystalline solids at room temperature. (i-Sitosterol, the major component in peanut sterols, has been shown to inhibit cancer growth (Awad el al. 2000) and may offer protection from colon, prostate and breast cancer. Unrefined peanut oil contains approximately 

200 mg sitosterol/lOOg of oil and this value is comparable to soybean oil that contains approximately 220mg sitosterol/lOOg (Awad el al. 2000). 

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