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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Radiochemical plasma salicylamide assay using ring-labeled tritiated salicylamide.

A rat plasma salicylamide assay was developed using ring-labeled tritiated salicylamide, synthesized by reacting salicylamide with tritium oxide in the presence of heptafluorobutyric acid. The reaction yielded 3H-salicylamide of specific activity up to 8.41 mCi/mmole, 60% yield. Plasma containing 3H-salicylamide and its metabolites was extracted with a toluene-based scintillation fluid, which was subsequently counted. Specificity for free salicylamide was demonstrated by radio chemical and standard fluorescence plasma salicylamide level-time curves. Specificity resulted from nonextraction of the salicylamide sulfate and glucuronide metabolites. Sulfatase and beta-glucuronidase treatment allowed the analysis of plasma sulfate and glucuronide conjugates as free salicylamide. This procedure should be effective for the analysis of salicylamide and its metabolites in the presence of similar phenolic compounds.[1]


  1. Radiochemical plasma salicylamide assay using ring-labeled tritiated salicylamide. Stella, V.J., Varia, S.A., Riedy, M. Journal of pharmaceutical sciences. (1979) [Pubmed]
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