Quality of Residual Oil from Palm-Pressed Mesocarp Fiber(Elaeis guineensis)Using Supercritical CO_2 With and Without Ethanol

摘要

The qualities of oils extracted from fresh and dried palm-pressed mesocarp fiber were evaluated.The means of extraction included conventional solvent extraction and supercritical carbon dioxide(SC-CO_2)extraction with and without addition of ethanol.Extraction efficiency using pure SC-CO_2 and the effect of moisture content on efficiency were studied.Minor components,such as vitamin E,carotenoids,squalene and phytos-terols,obtained by different methods were compared.The quality of oil recovered from fresh palm-pressed fiber is generally better than that of oil recovered from dried fiber.The SC-CO_2 extraction rate was lower for fresh fiber than for dried fiber.The incorporation of ethanol with SC-CO_2 resulted in oil with higher oxidative stability than did SC-CO_2 alone.Concentrations of minor components and the acylglycerol compositions of the oils extracted from both types of fibers were similar.