18F Radiolabeling via Solid Support Resin and Metal Chelation
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Solution Overview
Problem
Current methods for labeling peptides with 18F for PET imaging are time-consuming, require specialized equipment, and involve complex multi-step syntheses, including HPLC purification, which is not suitable for rapid kit formulations or use in clinical settings, especially for temperature-sensitive molecules.
Innovation Solution
The method involves binding 18F to a metal, such as aluminum, using a chelating moiety like NOTA or DOTA, which can be covalently linked to peptides or proteins, allowing for rapid labeling at lower temperatures and stability under physiological conditions, enabling efficient preparation of 18F-labeled molecules suitable for PET imaging without the need for HPLC purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional HPLC purification methods are used for 18F-labeled peptides, then purification precision is improved, but processing time increases and equipment complexity increases
Solution Approach 1:
The invention extracts and removes the HPLC purification step from the conventional radiolabeling process. By using a solid support resin that enables direct labeling and simplifies purification through filtration alone, the complex HPLC system is taken out of the workflow, reducing both equipment complexity and processing time while maintaining adequate purification precision for PET imaging applications.
Solution Approach 2:
The invention introduces a solid support resin as an intermediary medium that facilitates the labeling reaction and simplifies purification. The resin acts as a mediator that captures the 18F-labeled peptide while allowing impurities to be washed away, replacing the need for complex HPLC purification systems with a simple filtration step.
2Manufacturing precision
If conventional multi-step synthesis methods are used, then labeling precision is improved, but device complexity increases and processing time increases
Solution Approach 1:
The invention merges multiple conventional steps (labeling reaction, purification, and product formulation) into a single integrated process occurring on the solid support resin. The labeling reaction, previously requiring separate synthesis and purification steps, is combined into one step where the resin simultaneously facilitates reaction and enables simplified purification through filtration, thereby reducing equipment complexity while maintaining labeling precision.
Solution Approach 2:
The invention segments the labeling process into discrete stages on the solid support resin, allowing each step to be optimized independently. The resin provides a controlled environment for the labeling reaction while enabling separate, simplified purification steps, reducing the need for complex integrated systems while maintaining high labeling precision.
3Productivity
If high temperature labeling is used, then labeling efficiency is improved, but molecule stability deteriorates for temperature-sensitive molecules
Solution Approach 1:
The invention changes the physical parameters of the labeling environment by using a solid support resin system that enables effective labeling at lower temperatures. The resin provides a concentrated local environment that enhances reaction efficiency without requiring high temperatures, thereby maintaining molecule stability for temperature-sensitive peptides and proteins while still achieving high labeling efficiency.
4Productivity
If rapid labeling methods are used, then productivity is improved, but purification precision may deteriorate
Solution Approach 1:
The solid support resin acts as an intermediary that enables rapid labeling while maintaining purification precision. The resin captures the labeled product selectively during the brief reaction time, allowing fast processing without sacrificing purification quality. Impurities are efficiently removed through simple filtration of the resin-bound product, maintaining adequate precision for PET imaging despite the reduced processing time.
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
This approach enables the rapid preparation of 18F-labeled peptides with high specific activity in under 30 minutes, suitable for in vivo imaging, reducing the need for specialized equipment and personnel exposure to radiation, and allowing for stable, efficient labeling of temperature-sensitive molecules.
Implementation Method 1
binding 18F to a metal, such as aluminum, using a chelating moiety like NOTA or DOTA
Data Source
AI summary
The present application discloses compositions and methods of synthesis and use of 18F or 19F-labeled molecules of use in PET, SPECT and/or MR imaging. Preferably, the 18F or 19F is conjugated to a targeting molecule by formation of a complex with a group IIIA metal and binding of the complex to a bifunctional chelating agent, which may be directly or indirectly attached to the targeting molecule. In other embodiments, the 18F or 19F labeled moiety may comprise a targetable construct used in combination with a bispecific antibody to target a disease-associated antigen. The disclosed methods and compositions allow the simple and reproducible labeling of molecules at very high efficiency and specific activity in 30 minutes or less. In preferred embodiments, the labeled molecule may be used for imaging in a subject without purification after labeling.