Food testing
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How do you test for sugar?
You can use a Benedict’s solution. You add it to the substance and boil in a water-bath. There are different colours to find out the concentration of sugar. Brown/red means that there is a high amount. Orange/yellow means there is a moderate amount. Green/blue means that there is little or no amount of sugar.
How do you test for starch?
You add iodine to the substance. it turns blue/black if starch is present otherwise it will appear as orange/brown
How do you test for protein?
You add biuret’s solution to the food. it turns purple if it is present otherwise it will appear as blue
How do you test for fat?
There are two ways to do this: -You rub the substance against baking paper, if there is grease the substance has fat -You add ethanol to the substance to dissolve it and add water. if fat is present, it will turn white otherwise it will appear colourless