Oleic acid is a monounsaturated Ω9 fatty acid and a major component of membrane phospholipids that has been found in human plasma, cell membranes, and adipose tissue. It contributes approximately 17% of the total fatty acids esterified to phosphatidylcholine, the major phospholipid class in porcine platelets.High purity Oleic acid is a key raw material for Tween-80.