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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.
|
LT 1989 Rev. LT 09 Sep. 1999 |
| 2. Principle | Conductivity is measured in the water phase of a starch slurry
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| 3. Apparatus | 3.1 Conductivity meter with probe and temperature correction | Properly calibrated |
| 3.2 Laboratory scale
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| 4. Procedure | Weigh sample on (3.2) to the nearest g in a beaker | Ambient temperature |
Commercial starch: |
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 |
Starch slurry: |
The starch is allowed to settle. Measure conductivity of the water phase.
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| 5. Reporting | Report conductance as mS per cm (mScm-1)
with two decimals
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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