food test

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Any of several types of simple test, easily performed in the laboratory, used to identify the main classes of food.

Starch–iodine test
Food is ground up in distilled water and iodine solution is added. A dense black colour indicates that starch is present.

Sugar–Benedict's test
Food is ground up in distilled water and placed in a test tube with Benedict's reagent. The tube is then heated in a boiling water bath. If glucose is present the colour changes from blue to brick-red.

Protein–Biuret test
Food is ground up in distilled water and a mixture of copper(II) sulphate and sodium hydroxide is added. If protein is present a mauve colour is seen.

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