White precipitate is formed in

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(A) In Millon's test,the protein is first treated with $HNO_3$ to form nitrated derivatives. Upon addition of Millon's reagent (a solution of $Hg(NO_3

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Millon's test

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(A) In Millon's test,the protein is first treated with $HNO_3$ to form nitrated derivatives. Upon addition of Millon's reagent (a solution of $Hg(NO_3)_2$ and $Hg(NO_3)_2$ in $HNO_3$),a white precipitate is initially formed due to the coagulation of proteins. On heating,this precipitate turns red,which is a characteristic test for the presence of the phenolic group in the amino acid tyrosine.

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