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International Starch Institute
Science Park Aarhus, Denmark
ISI 11-1e Determination of pH and Acid Factor of Starch
|1. Scope||The method is applicable to commercial native starch
|LT 02. Dec. 1964
Rev. LT 16. Dec. 1997
|2. Principle||Titration of 40 g starch in slurry with acid to pH 3.0.
|3. Apparatus||3.1 Analytical balance weighing to the nearest 0.1 mg.|
|3.2 pH meter
|4. Reagents||4.1 Hydrochloric acid 0.1 N
|5. Procedure||Weigh 40.0 g sample to the nearest 100 mg in a 250 ml beaker|
|Add 100 ml distilled water and stir.|
|Note pH of slurry|
|Titrate with burette and (4.1) to pH = 3.0
V = ml (4.2). N = normality of (4.2)
|6. Calculation||Calculate acid factor of sample by averaging results of two samples with
Acid factor = 10 N V
Report pH of starch slurry as pH of starch with one decimal.
|Eventually correct to value on sample dry matter.|
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Keywords: laboratory method determination pH acid factor starch