Food tests

How do you test for sugar in a solution?

Prepare a food sample to a test tube, then prepare a water bath set to 75 degrees. Then add some benedicts solution in the test tube using a pipette. Place the tube in the water bath and leave for 5 minutes. If food sample contains sugar, test tube will turn from blue to green, yellow or red, depending on how much sugar is in the food.

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How do you test for starch in a solution?

Make a food sample and transfer 5cm (cubed) of your sample to a test tube, then add a few jobs of iodine solution and gently shake the tube to mix contents. If the solution contains starch, the colour of the solution will change from orange to black or dark blue.

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How do you test for proteins?

Prepare a sample of your food and transfer 2cm (cubed) of your sample to a test tube. Add 2 cm(cubed) of biruet solution to the sample and mix contents, shake tube. If the food sample contains protein, the solution will chane from blue to pink or purple. If no protein, solution will stay blue.

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How do you test for lipids?

Prepare a sample of food, transfer about 5cm (Cubed) into a test tube. Use a pipette to add 3 drops of Sudan III stain solution to the test tube and gently shake. The sudan III solution stains lipids, therefore, if the sample contains lipids, the mixture will seprate out into two layers. The top layer will be bright red. If no lipids are present, no seperate red layer will form.

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