Charge-Balanced Zwitterionic Metal Chelators for Rapid Clearance
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Solution Overview
Problem
Current metal chelators lack solubility in aqueous environments, result in non-specific interactions, and are not efficiently cleared from the body, leading to higher background and toxicity in medical 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
1Quantity of substance
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 increase
Solution Approach 1:
The patent introduces zwitterionic groups with balanced formal charges to change the electrostatic parameters of the chelator molecule. This charge balancing creates an extended hydration sphere that improves aqueous solubility while the zwitterionic nature minimizes non-specific electrostatic interactions with biological tissues.
Solution Approach 2:
The invention combines traditional metal-chelating moieties with zwitterionic groups to create a composite chelator structure. This composite design integrates the metal-binding capability of conventional chelators with the solubility-enhancing and interaction-minimizing properties of zwitterionic groups.
2Productivity
If common metal chelators are used, then metal complex formation is achieved, but clearance from the body is slow leading to accumulation in off-target tissues
Solution Approach 1:
The zwitterionic modification changes the hydrodynamic and electrostatic parameters of the chelator, creating an extended hydration sphere that facilitates renal filtration and rapid clearance from the body, reducing accumulation in off-target tissues and lowering background signal.
3Adaptability or versatility
If targeting vectors are conjugated to chelators by replacing carboxylic acid arms, then targeting capability is achieved, but chelating properties are compromised
Solution Approach 1:
The patent segments the chelator structure by introducing zwitterionic groups at positions that do not interfere with the metal-chelating core. This allows the chelating moiety to maintain its integrity and binding stability while the zwitterionic segments provide solubility and minimize non-specific interactions, and additional targeting vectors can be attached without compromising the chelating function.
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 off-target interactions in chemical and agricultural processes.
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 and less toxic
Implementation Method 2
pay little attention to the polyionicity and sphere of hydration that is required to fully isolate the metal
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.