รายละเอียดเอกสาร

The saponification value is calculated from the normalized fatty acid composition determined by gas-liquid chromatography. The method may be applied to all normal fats and oils, including linseed oil, provided they contain low concentrations of free fatty acids (= 0.1%) and mono- and diglycerides (= 0.1%). To meet this specification a freshly deodorized oil would have to be chromatographically fractionated over 5% water-deactivated silica gel to isolate the pure triglyceride fraction. The method is not directly applicable to fats and oils having a large unsaponifiable fraction.