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Food tests (Benedict's test (Method (Prepare a food sample and…
Food tests
Benedict's test
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Method
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If the food sample contains a reducing sugar, the solution in the test tube will change from normal blue to green, yellow or brick red - it depends on the amount of sugar that is in the food
Iodine solution
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Foods like pasta, rice and potatoes contain a lot of starch
Method
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If the sample contains starch, the colour of the solution will change from browny-orange to black or bluey-black
Biuret test
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Method
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Add a set amount (2cm^3) of biuret solution to the sample and mix the contents of the tube by gently shaking it.
If the food sample contains protein, the solution will change from blue to pink, or purple
Sudan III test
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Found in foods such as olive oil, margarine and milk.
Method
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Sudan III stain solution contains stain lipids. If the sample contains lipids, the mixture will separate out into 2 layers. The top layer will be bright late. If no lipids are present, no separate layer will form.