AIM: To test the presence of protein in the given food sample.
Food sample + few drops of NaOH + CuSO4 solution.
|A violet colouration is obtained.||Protein present.|
Food sample + few drops of concentrated HNO3. Heat.
|A yellow precipitate is obtained.||Protein present.|
Food sample + few drops of 0.15 ninhydrin solution. Boil the contents.
|A blue colour is obtained.||Protein present.|
RESULT: (ON RULED SIDE ) The food sample has been tested for proteins.