Food tests (multiple correct answers)

What steps should be taken to test for the presence of proteins in a food sample?

• Add a few drops of Biuret solution to the food sample.

• Mix the food sample with iodine solution.

• Observe for a violet or purple color change.

• Heat the mixture in a water bath.

What steps should be taken to test for the presence of lipids in a food sample using the emulsion test?

• Mix the food sample with ethanol.

• Add water to the mixture.

• Look for a cloudy white emulsion.

• Add Biuret solution and observe for a violet color change.

Which solution is used to test for the presence of proteins in a food sample?

• Iodine solution

• Biuret solution

• Ethanol

• Hydrochloric acid

What color change indicates the presence of proteins when using the Biuret test?

• Blue-black

• Cloudy white

• Violet or purple

• No color change

Which reagent is used to test for the presence of starch in a food sample?

• Iodine solution

• Biuret solution

• Ethanol

• Benedict's solution

What color change indicates the presence of starch when using iodine solution?

• Blue-black

• Cloudy white

• Violet or purple

• No color change

Which solution is used to test for the presence of reducing sugars in a food sample?

• Iodine solution

• Biuret solution

• Benedict's solution

• Hydrochloric acid