Direct Elution of Reactive [18F] Fluoride Without Evaporation
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Solution Overview
Problem
Current methods for producing [18F]fluoride for radiolabelling require an evaporation step, which is difficult to implement in automated 'Lab-on-chip' devices and limits the preparation duration and radiochemical yield, and makes it challenging to label sensitive compounds at lower temperatures.
Innovation Solution
A method that prepares reactive [18F]fluoride without an evaporation step using an anion exchange resin and an organic solution containing a polar aprotic solvent and an organic base, allowing for efficient elution and radiolabelling at room temperature, suitable for 'Lab-on-chip' systems and sensitive compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an evaporation step is used to remove excess water after fluoride recovery, then the radiochemical yield is improved, but the preparation duration increases and the process becomes difficult to implement in automated Lab-on-chip devices
Solution Approach 1:
The patent extracts and removes the problematic evaporation step from the traditional radiolabelling process. By using an organic solvent-based elution medium that directly provides reactive fluoride ions without requiring water removal, the invention eliminates the time-consuming evaporation step while maintaining high radiochemical yields through direct nucleophilic substitution reactions in the organic medium.
Solution Approach 2:
The patent changes the physical and chemical parameters of the elution medium by using organic solvents (such as acetonitrile, dimethyl sulfoxide, or dimethylformamide) instead of aqueous solutions. This parameter change allows the fluoride ions to remain reactive without requiring evaporation, thereby reducing preparation time while maintaining reaction efficiency.
2Reliability
If an evaporation step is implemented to dry the fluoride solution, then the radiolabelling efficiency is improved, but the device complexity increases and automation becomes difficult
Solution Approach 1:
The invention removes the evaporation step and associated complex equipment from the radiolabelling process. By using organic solvent-based elution that directly yields reactive fluoride ions suitable for nucleophilic substitution, the patent simplifies the overall process and enables easier automation in Lab-on-chip devices without compromising radiolabelling efficiency.
Solution Approach 2:
The patent replaces the mechanical evaporation process with a chemical solution approach. Instead of using heat and mechanical removal of solvent, the invention uses chemically pre-prepared organic elution media that directly provide reactive fluoride ions, thereby eliminating the need for complex evaporation equipment and enabling simpler automated systems.
3Quantity of substance
If traditional aqueous elution methods are used, then the fluoride recovery yield is high, but the subsequent radiolabelling requires additional drying steps and cannot be performed at room temperature
Solution Approach 1:
The patent changes the composition parameters of the elution medium by using organic solvents instead of aqueous solutions. This parameter change maintains high fluoride recovery yield through anion exchange resin while simultaneously providing reactive fluoride ions that can directly participate in nucleophilic substitution reactions without requiring additional drying steps, thereby simplifying the overall operation.
Solution Approach 2:
The organic elution medium serves multiple functions simultaneously: it elutes the fluoride ions from the anion exchange resin with high efficiency, provides an anhydrous environment suitable for nucleophilic substitution, and acts as the reaction medium for the radiolabelling step. This multi-functionality eliminates the need for separate drying and reaction preparation steps.
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 eliminates the need for evaporation, reduces preparation time, increases radiochemical yield, simplifies automated equipment, and enables labelling of temperature-sensitive precursors, making the process more efficient and adaptable for microfluidic devices.
Implementation Method 1
fluoride recovery is based on the use of an anion-exchange resin. The recovery is carried out in two steps, extraction and elution: first the anions (not only fluoride) are separated from the enriched [18O]water and trapped on the said resin
Implementation Method 2
a second compound (B) that is an organic base sufficiently strong to be able to tear off the acidic hydrogen of first compound (A) in an acid-base reaction, which leads to the formation of an organic salt (S)
Data Source
Figure 1(A)~1(B)
AI summary
The present invention relates to a method to extract out of an aqueous solution, concentrate and/or reformulate [18F] fluorides without any evaporation step characterised in that the eluting solution is a organic solution having a water content <3%, containing at least: an organic solvent suitable for the subsequent radiolabelling reaction; a first compound (A) which is a molecule containing at least one acidic hydrogen and a second compound (B) which is an organic base sufficiently strong to be able to tear off the acidic hydrogen of first compound (A) in an acid-base reaction leading to the formation of an organic salt (S).