Europium(III) DOTA-tetraamide Complexes as Redox-Active MRI Sensors
摘要:
PARACEST redox sensors containing the NAD(+)/NADH mimic N-methylquinolinium moiety as a redox-active functional group have been designed and synthesized. The Eu3+ complex with two quinolinium moieties was nearly completely CEST-silent in the oxidized form but was "turned on" upon reduction with beta-NADH. The CEST effect of the Eu3+ complex containing only one quinolinium group was much less redox-responsive but showed an unexpected sensitivity to pH in the physiologically relevant pH range.
Chemical exchange saturation transfer contrast agents
申请人:Caravan D. Peter
公开号:US20060275217A1
公开(公告)日:2006-12-07
Chelating ligands and metal chelates useful as CEST MR contrast agents are disclosed. The CEST agents can be used to evaluate blood volume changes in the heart and brain.
[EN] CHEMICAL EXCHANGE SATURATION TRANSFER CONTRAST AGENTS<br/>[FR] AGENTS DE CONTRASTE UTILISES POUR LE TRANSFERT DE SATURATION PAR ECHANGE CHIMIQUE (CEST)
申请人:EPIX PHARM INC
公开号:WO2006121889A2
公开(公告)日:2006-11-16
[EN] Chelating ligands and metal chelates useful as CEST MR contrast agents are disclosed. The CEST agents can be used to evaluate blood volume changes in the heart and brain. [FR] L'invention concerne des ligands de chélation et des chélates métalliques pouvant être utilisés en tant qu'agents de contraste pour l'imagerie par résonance magnétique selon la technique de transfert de saturation par échange chimique (CEST). Ces agents de contraste peuvent être utilisés pour évaluer les modifications de volume sanguin dans le coeur et dans le cerveau.
Amphiphilic EuDOTA‐Tetraamide Complexes Form Micelles with Enhanced CEST Sensitivity
作者:Osasere M. Evbuomwan、Garry Kiefer、A. Dean Sherry
DOI:10.1002/ejic.201101369
日期:2012.4
equations increased in parallel with an increase in alkyl carbon chain-length. By comparisons with the monomethylamide complex, which served as control, the data illustrate that micelle formation serves to slow the rate of water exchange in these systems. The complex having the largest CEST effect per unit Eu(III) concentration (the C(16) analog) had a detection limit of 5.3 μM. This represents an approximate
报道了四种具有可变烷基链长度(C(1)、C(12)、C(14) 和 C(16))的新型 DOTA-四酰胺配体及其各自的铕 (III) 配合物的合成和表征。三个具有长烷基链的 EuL 复合物自发形成不同大小的胶束。每种复合物的临界胶束浓度不同(C(16) 复合物低于 C(12) 复合物),而胶束尺寸随着烷基链长度的增加而增加。化学交换饱和转移 (CEST) 实验表明,所有四种 Eu(III) 配合物均表现出慢至中等的水交换动力学。正如预期的那样,由于水交换速度加快,这些复合物中的 CEST 信号随着温度的升高而降低,但有趣的是,C(14) 和 C(16) 复合物的 CEST 信号在 25°C 附近达到最大值,与交换限制的 CEST 一致。或接近室温。通过将 CEST 光谱拟合到 Bloch 方程获得的水停留寿命随着烷基碳链长度的增加而增加。通过与作为对照的单甲酰胺复合物进行比较,数据表明胶束
Europium(III) DOTA-tetraamide Complexes as Redox-Active MRI Sensors
作者:S. James Ratnakar、Subha Viswanathan、Zoltan Kovacs、Ashish K. Jindal、Kayla N. Green、A. Dean Sherry
DOI:10.1021/ja211601k
日期:2012.4.4
PARACEST redox sensors containing the NAD(+)/NADH mimic N-methylquinolinium moiety as a redox-active functional group have been designed and synthesized. The Eu3+ complex with two quinolinium moieties was nearly completely CEST-silent in the oxidized form but was "turned on" upon reduction with beta-NADH. The CEST effect of the Eu3+ complex containing only one quinolinium group was much less redox-responsive but showed an unexpected sensitivity to pH in the physiologically relevant pH range.