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International Starch Institute
Science Park Aarhus, Denmark
ISI 39-1e Determination of Conductivity of Starch
|1. Scope||The method is applicable to native and modified starch.
Rev. LT 09 Sep. 1999
|2. Principle||Conductivity is measured in the water phase of a starch slurry
|3. Apparatus||3.1 Conductivity meter with probe and temperature correction||Properly calibrated|
|3.2 Laboratory scale
|4. Procedure||Weigh sample on (3.2) to the nearest g in a beaker||Ambient temperature|
|Add the equivalent quantity of distilled water and stir for minimum 10 minutes. The starch is allowed to settle. Measure conductivity of the water phase.||Approx. 22 oBé|
|The starch is allowed to settle. Measure conductivity of the water phase.
|5. Reporting||Report conductance as mS per cm (mScm-1)
with two decimals
|mS = milliSiemens
S = ohm-1
|6. Notes||It essential to measure in a clear water phase free of starch, foreign particles and air affecting conductivity. Filter if nessesary.|
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Keywords: laboratory method determination conductivity starch