ISI 22-1e Determination of Starch in Fruitwater by Ewers
Return 1. Scope The method is applicable to potato and cassava fruitwater and fruitjuice (Effluent from the extraction of starch from tubers) LT 18. Dec. 64 Rev. LT 11. Dec. 98 2. Principle Granular starch is hydrolysed and determined by Ewers polarimetric method. 3. Apparatus 3.1 Analytical balance weighing to the nearest 1 mg. 3.2 Polarimeter with 2 dm tube 3.3 Shaking boiling water bath. 3.4 Volumetric flask, 100 ml with wide neck 3.5 Centrifuge 3.6 Conical glass beaker, 1500 ml with rack 4. Reagents 4.1 Dilute hydrochloric acid 0.12 N 4.2 Lead solution, satu