ISI 13-2e Determination of Starch in Tubers by Under Water Weight
ISI 13-2e Determination of Starch in Tubers by Under Water Weight 1. Scope The method is applicable to potato and cassava. For cassava roots it is important to note that the results can easily be compromised by air taken up in the roots LT 1986 Rev. LT 31. Dec. 1997 Rev. LT 18. March 2019 2. Principle Determination of under water weight of 5050 g tuber & roots 3. Apparatus 3.1 Underhanging balance 3.2 Stainless steel rod with two hooks. Distance between hooks = height of basket + approx. 10 cm. 3.3 Weighing net basket in stainless steel 3.4 Vessel with clean water of maximum 18 o C 4. Procedure Suspend rod (3.2) in underhanging balance (3.1). Place basket (3.3) on upper hook of rod (3.2). Place vessel (3.4) below balance, rod and basket. Fill vessel with water a few cm below basket. TARA Weigh TARA HIGH (T o ) of rod and empty basket to the nearest 0.1 g. Move basket to lower hook and weigh TARA LOW (T u ) to the nearest 0.1 g of rod and empty basket. Adjust hooks so basket