Zwitterionic Metal Chelators for Aqueous Solubility
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Solution Overview
Problem
Existing metal chelators lack solubility in aqueous environments, result in non-specific interactions, and are not efficiently cleared from the body, leading to high background and toxicity issues in medical, agricultural, and chemical processes.
Innovation Solution
Development of zwitterionic metal chelators with balanced formal charges and extended hydration spheres, minimizing non-specific interactions and facilitating rapid equilibration and clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common metal chelators (DOTA, PyC3A, macropa) are used, then metal binding capability is achieved, but solubility in aqueous environments is poor and non-specific interactions occur
Solution Approach 1:
The patent modifies the chemical parameters of metal chelators by introducing zwitterionic groups (containing both positive and negative charges) to alter the charge distribution and hydration properties of the chelator molecule, thereby improving solubility and reducing non-specific interactions while maintaining metal binding capability
Solution Approach 2:
The patent creates composite chelator structures by combining traditional metal-binding moieties with zwitterionic groups, forming a hybrid molecule that exhibits both strong metal chelation and improved aqueous solubility with reduced non-specific binding
2Reliability
If common metal chelators are used, then metal complex formation is achieved, but clearance from the body is inefficient leading to accumulation in off-target tissues
Solution Approach 1:
The patent optimizes pharmacokinetic parameters by incorporating zwitterionic groups that enhance renal filtration efficiency while maintaining metal complex stability, enabling the chelator to be cleared efficiently from the body without compromising its metal-binding function
3Adaptability or versatility
If carboxylic acid arms are replaced with targeting vectors, then targeting capability is improved, but chelating properties are compromised
Solution Approach 1:
The patent separates the targeting function from the chelating function by attaching targeting vectors to specific regions of the chelator molecule (such as pendant arms) while preserving the core metal-binding site, allowing both functions to operate independently and effectively
Solution Approach 2:
The patent applies different functional characteristics to different parts of the molecule: the core structure maintains strong metal chelation properties while peripheral regions are modified with targeting vectors or zwitterionic groups to provide targeting and solubility functions respectively
4Reliability
If conventional chelators are used in diagnostic imaging, then metal isotope binding is achieved, but background signal is high due to non-specific uptake
Solution Approach 1:
The patent modifies the physicochemical parameters of the chelator to reduce non-specific tissue uptake through zwitterionic group incorporation, which creates a more favorable charge distribution and hydration shell that minimizes interactions with non-target tissues, thereby improving the signal-to-background ratio in diagnostic imaging
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
Enhances signal-to-background ratio and therapeutic window in medical applications, improves solubility and reduces non-specific interactions in agricultural and chemical processes, and ensures efficient clearance from the body.
Implementation Method 1
whenever they are needed in a medical, agricultural, or chemical process they must be bound to, e.g. by coordination or chelation, to an organic compound that renders the complex soluble in aqueous environments
Data Source
AI summary
The present invention relates to zwitterionic metal chelators and their use as imaging, diagnostic, chemical processing, and treatment agents. These zwitterionic metal chelators have desirable properties that maximize solubility in aqueous environments, minimize non-specific interactions, and retain the ability to target thus resulting in an improved performance in a variety of medical, agricultural, and chemical processes. In in vivo and medical applications, zwitterionic metal chelators improve the signal-to-background ratio and therapeutic window as compared to other metal chelators while retaining high stability.