A direct method of radioiodination of biotin derivatives is presented
whereby radiolabeled sodium iodide is exchanged with a tributylstannyl
group under oxidative conditions. The in vitro binding of each radioi
odinated biotin derivative to streptavidin is saturable acid three of
the compounds exhibit a strong affinity for streptavidin. All the biot
in-streptavidin complexes are rapidly catabolized in human serum. Copy
right (C) 1996 Elsevier Science Ltd