Food tests

• During the biuret test if a protein is present, the substance will change to the colour purple, violet ,lilac or pink.
• Iodine is a yellow-orange liquid that can be used to test for the presence of starch. It changes colour to blue-black if starch is present in a test sample.
• Food tests include tests for certain nutrition types in food such as starch, lipids, protein, and sugars.
• The test for starch uses iodine solution, which turns to a blue-black color if starch is present.
• The test for lipids involves using filter paper, which becomes translucent if lipid is present.
• The solution will go cloudy if lipids are present, indicating their presence.
• A clarity appearance in the solution indicates the presence of lipids.
• A purple or lilac color in the solution indicates the presence of protein.
• A purple or lilac color in the solution indicates the presence of protein.
• A brick red color in the solution indicates the presence of sugars.
• Another way to test for lipids is to use ethanol and lipid, which results in a cloudy precipitate.
• A range of colors from blue to brick red may be observed as the solution changes from blue to brick red, indicating the presence of sugars.
• The test for protein involves using milk as an example, which can be tested by adding a few drops of iodine solution and observing if the iodine turns to a blue-black color, indicating the presence of protein.
• The test for sugars involves using a sugar solution, which can be tested by adding a few drops of iodine solution and observing if the iodine turns to a blue-black color, indicating the presence of sugar.