Radiolabeled biotin amides from triazenyl precursors: Synthesis, binding, and in‐vivo properties

Zbigniew P. Kortylewicz, Janina Baranowska‐Kortylewicz, S. James Adelstein, Alice D. Carmel, Amin I. Kassis

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


The synthesis of N‐(4‐[127/125/123l]iodobenzyl)biotin amides 4a — 4c performed by the direct decomposition of N‐[4‐(3′,3′‐dimethyltriazenyl)benzyl)biotin amide with sodium iodide in the presence of CF3COOH is described. Iodinated in this way biotin formed a stable complex with avidin (Kd = 2.84 ± 0.45 × 10−15 M, n = 3.9 ± 0.6) which dissociated in the presence of excess native biotin with a rate constant of 0.034 ± 0.006 hr1. Blood clearance studies and the lack of thyroid uptake indicated that this compound was not deiodinated in vivo and behaved in circulation much like native biotin. This aryltriazene precursor method is suitable for labeling with short‐lived radiohalides. It can be used to produce no‐carrier‐added derivatives of biotin for use in biologic studies and assays involving avidin or streptavidin.

Original languageEnglish (US)
Pages (from-to)1129-1146
Number of pages18
JournalJournal of Labelled Compounds and Radiopharmaceuticals
Issue number12
StatePublished - Dec 1994
Externally publishedYes


  • Biodistribution
  • Biotin
  • Iodobenzylbiotin Amides
  • Triazene
  • l‐radioiodination

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Radiology Nuclear Medicine and imaging
  • Drug Discovery
  • Spectroscopy
  • Organic Chemistry


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