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Related Experiment Video

Updated: Jul 10, 2025

Enhancing Efficiency and Radiolabeling Yields of Carbon-11 Radioligands for Clinical Research Using the Loop Method
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Enhancing Efficiency and Radiolabeling Yields of Carbon-11 Radioligands for Clinical Research Using the Loop Method

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11C-Fixation Techniques.

Emily Murrell1, Anton Lindberg1, Armando Garcia1

  • 1Azrieli Centre for Neuro-Radiochemistry, Brain Health Imaging Centre, Centre for Addiction and Mental Health, Toronto, ON, Canada.

Methods in Molecular Biology (Clifton, N.J.)
|November 25, 2023
PubMed
Summary
This summary is machine-generated.

This study presents one-pot methods for radiolabeling small molecules using cyclotron-produced carbon-11 gas. These efficient carbon-11 fixation techniques enable the synthesis of various radiolabeled compounds for research and production.

Keywords:
Carbon dioxideCarbon monoxideCarbon-11CarbonylationCarboxylation

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Metabolic Pathway Confirmation and Discovery Through 13C-labeling of Proteinogenic Amino Acids
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Area of Science:

  • Radiochemistry
  • Nuclear Medicine
  • Organic Synthesis

Background:

  • Carbon-11 (11C) is a positron-emitting radionuclide crucial for Positron Emission Tomography (PET) imaging.
  • Efficient methods for incorporating 11C into target molecules are essential for developing new PET radiotracers.

Purpose of the Study:

  • To describe a protocol for direct 11C-carboxylation and 11C-carbonylation reactions.
  • To present one-pot methods for trapping cyclotron-generated [11C]CO2 and [11C]CO.

Main Methods:

  • Utilizing cyclotron-generated [11C]CO2 for carboxylation and [11C]CO for carbonylation.
  • Employing one-pot procedures with gas trapping at room temperature and atmospheric pressure.
  • Adapting the protocol for a commercial automated synthesis unit.

Main Results:

  • Demonstrated wide applicability to numerous small molecules.
  • Successful synthesis of various 11C-labeled compounds including carboxylic acids, amides, esters, ketones, oxazolidinones, carbamates, and ureas.
  • Established a robust method for routine radiopharmaceutical production.

Conclusions:

  • The described 11C-fixation techniques offer a versatile and efficient approach for radiolabeling.
  • The protocol is readily adaptable for automated synthesis and routine production of 11C-labeled radiopharmaceuticals.