H]-phenylalanine was prepared by catalytic halogen-tritium exchange method The labelled T was removed by repeated equilibration with methanol and water. Finally the product was purified by paper chromatograph. The specific radioactivity of DL-[4-
3
H]-phenylalanine is 16.6 Ci/mmol. The radiochemical purity is more than 95%.
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references
Ch. Gerday and W. G. Verly , J. Label, comp ., 4 , 4 , 334 ( 1968 ).
范国平 等 , 标记化合物 , 原子能出版社 , 1979 年,第 63 页。
E. Evans , Tritium and its compounds , second Edition , 1974 , p. 318 .