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Q.

Which of the following is used in a colour test of amino acid ?

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a

Cyanogen bromide

b

Chymotrypsin

c

Trypsin

d

Ninhydrin

answer is A.

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Detailed Solution

  • The ninhydrin test is a chemical test which is used to check whether a given analyte contains amines or α-amino acids. 
  • In this test, ninhydrin (a chemical compound with the formula C9H6O4; IUPAC name: 2,2-dihydroxyindane-1,3-dione) is added to a test solution of the analyte. 
  • The development of a deep blue color indicates the presence of ammonia, primary/secondary amines, or amino acids in the analyte.
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