ISI 18-1e Determination of Hydroxyethyl Content in Starch
Return 1. Scope The method is applicable to hydroxyethylated starch LT 20.06.1966 Rev. 17.03.1998 2. Principle The hydroxyethyl ether is cleaved in boiling HJ-solution. The ethylene is distilled and titrated. 3. Apparatus 3.1 Analytical balance weighing to the nearest 0.1 mg. 3.2 Oil bath, thermostatic 3.3 Distilling apparatus with five collection flasks 4. Reagents 4.1 Iodine hydrogen solution (HJ) for alkoxide determination; density 1.70; boiling point 126 -127 o C 4.2 Alcoholic silver nitrate solution: 15.0 g AgNO 3 is dissolved in 28 ml distilled