Orthogonal synthesis of a heterodimeric ligand for the development of the GdIII–GaIII ditopic complex as a potential pH-sensitive MRI/PET probe
作者:Nikolay Vologdin、Gabriele A. Rolla、Mauro Botta、Lorenzo Tei
DOI:10.1039/c2ob27200h
日期:——
A heterodimeric polyaminocarboxylate ligand based on a DO3A-sulfonamide linked to AAZTA (6-amino-6-methylperhydro-1,4-diazepinetetracarboxylic acid) was synthesised via an orthogonal pathway in order to differentiate the two chelating cages and allow the formation of a GdIIIâGaIII heteroditopic complex. The goal is to create a smart MRI/PET probe with pH dependent relaxivity and with the bimodal imaging approach that enables direct quantification of the stimulus, in this case pH. A 1H NMR relaxometric study of the GdâGa heteroditopic complex addressed the pH modulation of the relaxivity and thus its possible use as an MRI pH sensitive probe.
我们通过正交途径合成了一种基于 DO3A 磺酰胺与 AAZTA(6-氨基-6-甲基全氢-1,4-二氮杂环庚烷四羧酸)的异二聚体多氨基羧酸配体,以区分两种螯合笼,并形成 GdIIIâGaIII 异二聚体复合物。我们的目标是研制出一种智能 MRI/PET 探针,它具有与 pH 值相关的弛豫性,并采用双模成像方法,能够直接量化刺激因素(在本例中为 pH 值)。对 GdâGa 异二价复合物进行的 1H NMR 驰豫度研究解决了驰豫度的 pH 值调制问题,因此可以将其用作 MRI pH 值敏感探针。