Chemistry · Components of Food
During the test for proteins in a food sample using copper sulphate and caustic soda, the solution turns violet primarily due to:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1The oxidation of O-peptide bonds present in the lipid layer of food.
- 2The presence of peptide bonds in the food which form a coordination complex with copper ions.✓
- 3The alkaline nature of methyl orange changing its color to violet.
- 4The reaction of copper sulphate with carbohydrates to form a violet complex.
Correct answer
The presence of peptide bonds in the food which form a coordination complex with copper ions.
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