Isostructural Re and 99mTc complexes of biotin derivatives for fluorescence and radioimaging studies

Shelly James, Kevin P. Maresca, John W. Babich, John F. Valliant, Laurie Doering, Jon Zubieta

Research output: Contribution to journalArticlepeer-review

59 Scopus citations


The reaction of biotinamine with two equivalents of 2-quinoline aldehyde in the presence of Na(OAc)3BH in dichloroethane provides N,N-bis(methylquinoline)biotinamine (L1), a molecule displaying a tridentate donor terminus which has proven effective in coordinating to the (M(CO) 3}+ core (M = Tc, Re). Reaction of L1 with (NEt 4)2[Re(CO)3Br3] yields [Re(CO) 3(L1)]Br, a compound with an absorbance at 350 nm and luminescence emission maxima at 425 and 580 nm. The luminescence lifetime of 11.4 μs, which is associated with the 580 nm emission, is sufficiently prolonged to enable time-gating techniques to be used during in vitro imaging studies and to overcome interference from endogenous fluorescence. Exposure of avidin beads to (Re(CO)3(L1)]Br resulted in binding, which was qualitatively imaged using fluorescence microscopy. The 99mTc analogue [ 99mTc(CO)3(L1)]+1 was prepared by reacting L1 with [99mTc(CO)3(H2O)3]+1 and purified by HPLC. The 99mTc complex is chemically robust and resistant to cysteine and histidine challenges. This study demonstrates that complementary fluorescent and radioactive biotin-derived probes may be readily prepared to allow direct correlation of in vitro and in vivo molecular imaging studies.

Original languageEnglish (US)
Pages (from-to)590-596
Number of pages7
JournalBioconjugate Chemistry
Issue number3
StatePublished - May 2006

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering
  • Pharmacology
  • Pharmaceutical Science
  • Organic Chemistry

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