Define procedure for testing the presence of urea in milk, Biology

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Define Procedure for Testing the Presence of Urea in Milk?

1. To 0.5 ml of milk add 0.5 ml of DMAB solution (prepared by dissolving 0.4 gm of p-dimethyl amino benzaldehyde powder in 250 ml of alcohol and 23 ml of concentrated HCl).

2. Observe for the colour change.

3. Change of colour from white to yellow shows adulteration in the sample.

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