<b>Bn<sub>2</sub>DT3A</b>, a Chelator for <sup>68</sup>Ga Positron Emission Tomography: Hydroxide Coordination Increases Biological Stability of [<sup>68</sup>Ga][Ga(Bn<sub>2</sub>DT3A)(OH)]<sup>−</sup>
作者:Thomas W. Price、Isaline Renard、Timothy J. Prior、Vojtěch Kubíček、David M. Benoit、Stephen J. Archibald、Anne-Marie Seymour、Petr Hermann、Graeme J. Stasiuk
DOI:10.1021/acs.inorgchem.2c01992
日期:2022.10.31
The chelator Bn2DT3A was used to produce a novel 68Ga complex for positron emission tomography (PET). Unusually, this system is stabilized by a coordinated hydroxide in aqueous solutions above pH 5, which confers sufficient stability for it to be used for PET. Bn2DT3A complexes Ga3+ in a hexadentate manner, forming a mer-mer complex with log K([Ga(Bn2DT3A)]) = 18.25. Above pH 5, the hydroxide ion coordinates
螯合剂Bn 2 DT3A用于生产用于正电子发射断层扫描 (PET)的新型68 Ga 配合物。不同寻常的是,该系统在 pH 值高于 5 的水溶液中由配位氢氧化物稳定,这为其用于 PET 提供了足够的稳定性。Bn 2 DT3A以六齿方式与Ga 3+配合,形成log K ([Ga( Bn 2 DT3A )]) = 18.25的mer-mer配合物。pH 值高于 5 时,氢氧根离子与配位胺解离后的 Ga 3+离子配位。Bn 2 DT3A放射性标记显示出依赖于 pH 值的形态,其中 [ 68 Ga][Ga( Bn 2 DT3A )(OH)] -在 pH 5 以上形成并在 pH 7.4 时有效地进行放射性标记。令人惊讶的是,与[ 68 Ga][Ga( Bn 2 DT3A )(OH)] - 相比,[ 68 Ga ] [ Ga ( Bn 2 DT3A ) (OH)] -的体外稳定性(在胎牛血清中超过 2 小时)显示出增加的稳定性]。[