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food tests, download - Coggle Diagram
food tests
reducing sugar
reagents
starts out aqua-blue. As it is heated in the presence of reducing sugars, it turns yellow to orange.
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observation
the reagent changes color: from green to dark red or rusty-brown, depending on the quantity and type of sugar.
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starch
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procedure
- by adding iodine onto the food
- check if the colour of the iodine changed
observation
if starch is present the brown iodine will turn into a blue black colour.
If there is no starch present, the iodine will remain brown
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proteins
reagents:To test for food contamination, a sample of the food item is taken and analyzed in a laboratory. Pathogen tests are used on the sample with results that quickly indicate if any forms of bacteria
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procedure: Biuret solution is used to identify the presence of protein. Biuret reagent is a blue solution that, when it reacts with protein, will change color to pink-purple.
fats
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observation
a cloudy white emulsion will form in the presence of the fats. in the absence of fats. the solution will remain clear.
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