Protein Test

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AIM: To test the presence of protein in the given food sample.

PROCEDURE:

S. No. Experiment Observation  Inference
1

BIURET TEST

Food sample + few drops of NaOH + CuSO4 solution.

A violet colouration is obtained. Protein present.
OR
2

XANTHOPROTEIC TEST

Food sample + few drops of concentrated HNO3. Heat.

A yellow precipitate is obtained. Protein present.
OR
3

NINHYDRIN TEST

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.

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