Preparation of tritium labelled L‐phenylalanine

Abstract
Tritiated N‐chloracetyl‐DL‐phenylalanine, obtained by reduction of the N‐chloracetyl‐dehydrophenylalanine with tritiated hydrogen, is hydrolysed by carboxypeptidase A. The method gives L‐phenyl‐alanine‐2,3‐3H of high optical purity and with any specific activity up to 60 curies per millimole.

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