Cyclodextrin-Linked Polyvalent Ligands for Gadolinium Complexation
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Solution Overview
Problem
Current MRI contrast agents based on gadolinium complexes face issues such as toxicity, stability problems, and adverse reactions, leading to reduced use and regulatory challenges, necessitating the development of alternative compounds with improved affinity and stability for lanthanide ions.
Innovation Solution
Development of cyclodextrin-based compounds with iminodiacetate and 1,2,3-triazole moieties linked to the cyclodextrin scaffold, providing an octavalent coordination sphere for lanthanide ions, enhancing binding affinity and stability while allowing for dynamic water coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If gadolinium complexes are used as MRI contrast agents, then imaging contrast is improved, but toxicity and adverse reactions increase
Solution Approach 1:
The patent introduces cyclodextrin-based ligands as intermediary compounds that selectively bind gadolinium ions, forming stable complexes that reduce free gadolinium toxicity while maintaining MRI contrast properties. The ligand acts as a mediator between the gadolinium ion and the biological system, providing both imaging functionality and safety.
Solution Approach 2:
The patent modifies the chemical parameters of gadolinium complexes by introducing cyclodextrin-based ligands with specific steric and electronic properties. These parameter changes result in altered complex stability, hydrophobicity, and binding characteristics that simultaneously improve imaging contrast and reduce toxicity.
2Object-affected harmful factors
If polyaminocarboxylate-based ligands are used to form stable Gd(III) complexes, then toxicity is reduced, but availability of contrast agents is limited
Solution Approach 1:
The patent segments the contrast agent system into modular components: cyclodextrin-based ligands that can be independently designed and synthesized. This segmentation enables diverse ligand variations with different steric configurations and binding modes, expanding the availability of safe contrast agents while maintaining low toxicity through the common cyclodextrin scaffold.
Solution Approach 2:
The patent creates composite contrast agent systems combining cyclodextrin-based organic ligands with gadolinium ions. These composite complexes leverage the stability of the ligand-metal interaction to provide both low toxicity and high imaging contrast, overcoming the limitations of existing single-class contrast agents.
3Reliability
If cyclodextrin-based compounds are designed with iminodiacetate and 1,2,3-triazole moieties, then binding affinity for lanthanide ions is improved, but structural complexity increases
Solution Approach 1:
The patent merges multiple functional moieties (iminodiacetate and 1,2,3-triazole) onto a single cyclodextrin-based scaffold. This combining approach creates a unified ligand structure that achieves high binding affinity through cooperative interactions of multiple groups while avoiding the complexity of separate, unconnected binding elements.
Solution Approach 2:
The patent applies local quality by positioning specific functional groups (iminodiacetate and 1,2,3-triazole) at particular locations on the cyclodextrin scaffold. This localized arrangement optimizes binding affinity for lanthanide ions by creating specific coordination geometries while keeping the overall structure manageable and synthesizable.
4Stability of the object's composition
If cyclodextrin-based compounds form multinuclear complexes, then stability constants are improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs preliminary action by designing cyclodextrin-based ligands with pre-organized functional groups that are positioned to facilitate multinuclear complex formation. The ligand structure is prepared in advance with built-in coordination sites that guide the assembly of stable multinuclear complexes, reducing the complexity of the manufacturing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cyclodextrin-based compounds demonstrate high stability constants comparable to commercial DOTA-Gd(III) complexes, forming multinuclear complexes and significantly improving water relaxation times, offering potential as effective MRI contrast agents and for heavy metal detoxification.
Implementation Method 1
The compounds exhibit strong binding affinities for lanthanides... forming an octavalent coordination sphere for lanthanide ions
Implementation Method 2
favorable characteristics with respect to altering the relaxation time of coordinated water molecules... catalytic alteration of relaxivities of proton nuclei of water
Data Source
AI summary
Compounds are described which include polyvalent ligands linked to a cyclodextrin scaffold which exhibit strong binding affinities for lanthanides and favorable characteristics with respect to altering the relaxation time of coordinated water molecules. The compounds are useful as contrast agents in applications such as magnetic resonance imaging. The polyvalent ligands are also useful in applications requiring chelation of metal ions in other applications such as water treatment, sequestration of metal ions and treatment of diseases or conditions caused by exposure to toxic or radioactive metal ions.