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Luff–Schoorl method

For determination of starch and sugars. Sugars are extracted using ethanol, then starch is hydrolysed using hydrochloric acid and the resultant glucose is extracted after neutralisation. Sugars are determined in the extracts after oxidation using copper reagent, linked to the reduction of potassium iodide to iodine, and titration of iodine with sodium thiosulphate.