A simple Tracerlab module modification for automated on-column [11C]methylation and [11C]carboxylation

Area of Science:

• Radiochemistry
• Nuclear Medicine
• Organic Synthesis

Background:

• Automated synthesis of radiopharmaceuticals is crucial for clinical applications.
• Existing modules often lack versatility for multiple reaction types.
• Development of adaptable systems can improve efficiency and accessibility.

Purpose of the Study:

• To describe a modified commercial methylation module adaptable for both methylation and carboxylation.
• To demonstrate the module's utility in synthesizing key [11C]radiopharmaceuticals.
• To evaluate the efficiency and reliability of the automated system.

Main Methods:

• Modification of a commercial [11C]methylation module for dual functionality.
• Application of the module to solid-phase synthesis of N-[11C]methyl-choline ([11C]choline) and L-(S-methyl-[11C])methionine ([11C]methionine) using [11C]CH(3)I.
• Synthesis of [11C]acetate via [11C]carboxylation using [11C]CO2 and methylmagnesium chloride.

Main Results:

• The modified module successfully performed both on-column [11C]methylation and [11C]carboxylation.
• High and reproducible radiochemical yields were achieved for [11C]choline, [11C]methionine, and [11C]acetate.
• Short reaction times were consistently observed for all synthesized radiopharmaceuticals.

Conclusions:

• The described module modification offers a fast and reliable automated tool for radiopharmaceutical production.
• This versatile system enhances the capability for synthesizing multiple [11C]radiotracers.
• The system is suitable for the routine production of essential [11C]radiopharmaceuticals for clinical diagnostic use.