This method is suitable to determine the starch content of cane raw sugar at levels between 300 µg/g and 1000 µg/g.
Any starch in the sugar solution is solubilised and iodide/iodate added to form a blue starch-iodine complex.
The absorbance of the solution is then measured by spectrophotometry at 600 nm and compared to a standard curve produced using soluble potato starch.
The absolute difference between two results obtained under repeatability conditions should not be greater than 7.4 µg/g and under reproducibility conditions not greater than 23 µg/g.
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Please click here to open ICUMSA Method GS1-17 (2013).