39. VOLATILE OILS VS FIXED OILS Low refractive index High refractive index Esters of fatty acid with glycerol Mixtures of oleoptenes and stereoptenes Can be saponified Cannot be saponified After evaporation, do leave spot Leave no spot after evaporation Obtained by extraction Obtained by distillation Don't get volatiles at room temperature Volatilize at room temperature Fixed oils Volatile oils
40. FATS VS FIXED OILS Contain unsaturated glycerides e.g. glyceryl oleate Contain saturated glycerides e.g. glyceryl stearate Liquid at room temperature Solid at room temperature Fixed oils Fats