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Highly efficient automated synthesis of [(11)C]choline for multi dose utilization
G Reischl1, C Bieg, O Schmiedl
1PET-Zentrum, Radiopharmazie, Universitätsklinikum Tübingen Röntgenweg 15, Tübingen D-72076, Germany. gerald.reischl@uni-tuebingen.de
Summary
An automated synthesis of [(11)C]Choline, a PET imaging agent for prostate cancer, was developed. This improved method yields high purity tracer rapidly, enabling better tumor imaging.
Area of Science:
- Nuclear Medicine
- Radiochemistry
- Oncology
Background:
- [(11)C]Choline is a positron emission tomography (PET) ligand investigated for imaging tumor tissues, particularly prostate cancer.
- Existing synthesis methods for [(11)C]Choline may require optimization for efficiency and yield.
Purpose of the Study:
- To establish an improved and automated synthesis process for [(11)C]Choline.
- To optimize reaction conditions for enhanced radiochemical yield, purity, and reduced synthesis time.
Main Methods:
- Automated radiosynthesis of [(11)C]Choline via methylation of 2-(dimethylamino)-ethanol (DMAE) using [(11)C]CH(3)I.
- Purification of the tracer using a cation exchange cartridge.
- Optimization of reaction parameters including synthesis time and DMAE quantity.
Main Results:
- Radiochemical yields exceeding 80% were achieved within 20 minutes using 60 microl of DMAE.
- Radiochemical purity of the final product was greater than 99%.
- Residual DMAE levels were consistently below 10 ppm, with final activities of 30.0+/-5.6 GBq (n=29) obtained.
Conclusions:
- An efficient, automated synthesis of [(11)C]Choline has been successfully established.
- The optimized method provides high yields and purity, suitable for clinical applications in PET imaging.
- This improved tracer production facilitates enhanced imaging of tumor tissues, especially prostate cancer.