Iron(II) PARACEST MRI contrast agents.
Iron(II) PARACEST MRI contrast agents.
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DOI:
10.1021/ja204297z
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发表时间:
2011-09-14
影响因子:
15
通讯作者:
Morrow JR
中科院分区:
文献类型:
--
作者:
Dorazio SJ;Tsitovich PB;Siters KE;Spernyak JA;Morrow JR
The first examples of Fe(II) PARACEST magnetic resonance contrast agents are reported (PARACEST = paramagnetic chemical exchange saturation transfer). The iron(II) complexes contain a macrocyclic ligand, either 1,4,7-tris(carbamoylmethyl)-1,4,7-triazacyclononane (L1) or 1,4,7-tris[(5-amino-6-methyl-2-pyridyl)methyl]-1,4,7-triazacyclononane (L2). The macrocycles bind Fe(II) in aqueous solution with formation constants of log K = 15.6 and 19.2, respectively and maintain the Fe(II) state in the presence of air. These complexes each contain six exchangeable protons for CEST which are amide protons in [Fe(L1)]2+ or amino protons in [Fe(L2)]2+. The CEST peak for the [Fe(L1)]2+ amide protons is at 69 ppm downfield of the bulk water resonance whereas the CEST peak for the [Fe(L2)]2+ amine protons is at 6 ppm downfield of bulk water. CEST imaging using a MRI scanner shows that the CEST effect can be observed in solutions containing low millimolar concentrations of complex at neutral pH, 100 mM NaCl, 20 mM buffer at 22 °C or 37 °C.
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