High denticity oxinate-linear-backbone chelating ligand for diagnostic radiometal ions [<sup>111</sup>In]In<sup>3+</sup> and [<sup>89</sup>Zr]Zr<sup>4+</sup>
[111In]In(decaox) complex remained 91% intact after 24 hours while the [89Zr]Zr(decaox) complex was 86% intact over the same time, comparable to other chelating ligands previously assessed with the same methods. The high radiolabeling yields, limited serum protein transchelation and structural insight of the [89Zr]Zr(decaox) complex suggest a promising fit between the oxinate-containing ligand and the Zr4+
Cyclen-based chelators for the inhibition of Aβ aggregation: Synthesis, anti-oxidant and aggregation evaluation
作者:Mahmoud El Safadi、Mohan Bhadbhade、Ronald Shimmon、Anthony T. Baker、Andrew M. McDonagh
DOI:10.1016/j.ica.2017.07.060
日期:2017.10
The aggregation of the protein amyloid-beta in the brain has been associated with neurodegenerative diseases such as Alzheimer's disease. Such aggregation of amyloid-b can be induced by misregulated metal ions such as Cu2+ and Zn2+. Here we present four metal chelating compounds based on the cyclen macrocycle that each bear a pendant arm to provide additional anti-oxidant activity. The corresponding Cu2+, Zn2+ and Ni2+ complexes have been synthesized and characterized to examine the ability of the chelators to bind to the metal centres. A beta(40) de-aggregation by the cyclen compounds was assessed using turbidometry and the re-solubilization of the A beta(40) was also examined. Our results show that the cyclen compounds have the ability to effectively chelate Cu2+ and Zn2+ metal ions and thus de-aggregate A beta(40) that has been aggregated due to the presence of these ions. The antioxidant properties of the cyclen compounds were tested by using the DPPH scavenging assay and the results show that some of the compounds can decrease oxidative stress. (C) 2017 Elsevier B.V. All rights reserved.
US5082666A
申请人:——
公开号:US5082666A
公开(公告)日:1992-01-21
Metal ion size profoundly affects H<sub>3</sub>glyox chelate chemistry
作者:Neha Choudhary、Kendall E. Barrett、Manja Kubeil、Valery Radchenko、Jonathan W. Engle、Holger Stephan、María de Guadalupe Jaraquemada-Peláez、Chris Orvig
DOI:10.1039/d1ra01793d
日期:——
bisoxine hexadentate chelating ligand, H3glyox was investigated for its affinity for Mn2+, Cu2+ and Lu3+ ions; all three metalions are relevant with applications in nuclear medicine and medicinal inorganic chemistry. The aqueous coordination chemistry and thermodynamic stability of all three metal complexes were thoroughly investigated by detailed DFT structure calculations and stability constant determination
Trastuzumab for a proof-of-concept study with 89Zr. H4neunox was synthesized from the tris(2-aminoethyl)amine backbone, decorated with 8-hydroxyquinoline moieties, and utilizes a primary amine for functionalization. A maleimide moiety extends the chelator to create H4neunox-mal for antibody conjugation via maleimide-thiol click chemistry. Preliminary 89Zr radiolabeling of H4neunox indicated quantitative radiolabeling