Gadolinium Chelation
Gadolinium Chelation - Related Videos
05:15
An Aptamer-based Sensor for Unchelated Gadolinium(III)
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2017
The use of polydeoxynucleotide (44-mer aptamer) molecules for sensing unchelated gadolinium(III) ion in an aqueous solution is described. The presence of the ion is detected via an increase in the fluorescence emission of the sensor.
01:19
Complexation Equilibria: The Chelate Effect
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2024
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
09:01
High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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2017
Europium thenoyltrifluoroacetonate (EuTFC) has an optical luminescence line at 612 nm, whose activation efficiency decreases strongly with temperature. If a sample coated with a thin film of this material is micro-imaged, the 612 nm luminescent response intensity may be converted into a direct map of sample surface temperature.
05:36
Quantifiable and Inexpensive Cell-Free Fluorescent Method to Confirm the Ability of Novel Compounds to Chelate Iron
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Cited by 1 •
2024
We describe a fluorescent assay that can quickly and inexpensively confirm the ability of novel compounds to chelate iron. The assay measures the ability of compounds to outcompete the iron binding activity of the weak iron chelating fluorescent probe Calcein, resulting in a quantifiable increase in fluorescence when chelation occurs.
10:54
Preparation and Evaluation of 99mTc-labeled Tridentate Chelates for Pre-targeting Using Bioorthogonal Chemistry
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Cited by 7 •
2017
Here, we describe a protocol for radiolabeling and in vivo testing of tridentate 99mTc(I) chelate-tetrazine derivatives for pre-targeting and bioorthogonal chemistry.
FAQs
Stability depends on how ligand structure positions electron-donor atoms around Gd3+ and how many such interactions the multidentate framework can provide. Oxygen- and nitrogen-containing donor sites form coordinate bonds, while the surrounding molecular architecture affects solubility and resistance to metal release. Consequently, ligand design must be considered together with the solution conditions in which the complex will exist.
A gadolinium complex does not have a fixed behavior independent of its surroundings. Solution conditions can influence complex stability, solubility, and resistance to release of the metal ion. These variables therefore help determine whether coordination remains effective under the intended setting. In chemistry studies, controlling or comparing such conditions is essential for interpreting how reliably the ligand retains gadolinium.
The chelated complex combines two relevant chemical outcomes: it keeps gadolinium in a molecular form that limits exposure to unbound metal, and it uses the ion’s paramagnetic influence on water-proton relaxation. That relaxation change is the basis for MRI contrast. Useful agent design therefore requires balancing molecular stability with the complex’s ability to produce the intended magnetic effect.
Assessment can focus on several linked properties: how effectively the ligand binds gadolinium, how stable the resulting molecule remains, how readily it stays soluble, and how resistant it is to metal release. Examining these properties under relevant solution conditions helps chemistry researchers characterize molecular stability rather than relying on binding alone. The same analysis can inform biological or environmental studies.
Design requires attention to both coordination chemistry and magnetic function. The molecular complex should limit exposure to free gadolinium by resisting metal release, while the paramagnetic gadolinium still alters water-proton relaxation in a useful way. Solubility also matters because it is one of the properties influenced by ligand structure and solution conditions. These criteria connect molecular design with imaging performance.
These complexes provide a way to study how gadolinium binding and molecular stability relate to behavior beyond a purely structural description. Researchers can examine how ligand structure and solution conditions affect complex stability, solubility, or metal release, and then consider the resulting biological or environmental behavior. This extends chelation research beyond MRI contrast-agent development.