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In-target produced [11C]methane: Increased specific radioactivity.

Jan Andersson1, Phong Truong, Christer Halldin

  • 1Department of Clinical Neuroscience, Psychiatry Section, Karolinska Institutet, Karolinska University Hospital, S-17176 Stockholm, Sweden.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|November 18, 2008
PubMed
Summary

Producing carbon-11 methane ((11)C)CH(4) via proton bombardment offers a new pathway for high specific radioactivity (SA) radiopharmaceuticals. This method significantly enhances SA for compounds like (11)C-raclopride by over 30-fold.

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Technical Aspect of the Automated Synthesis and Real-Time Kinetic Evaluation of [11C]SNAP-7941

Published on: April 28, 2019

Area of Science:

  • Nuclear Chemistry
  • Radiopharmaceutical Production
  • Medical Imaging

Background:

  • The (14)N(rho, alpha)(11)C reaction is a known method for producing carbon-11 ((11)C) labeled compounds.
  • Traditional methods using [(11)C]CO(2) as a precursor limit the specific radioactivity (SA) of downstream radiopharmaceuticals.
  • High specific radioactivity is crucial for sensitive molecular imaging applications.

Purpose of the Study:

  • To report the production of [(11)C]methane ((11)C)CH(4) as a target material.
  • To evaluate the synthesis of [(11)C]methyl iodide ((11)C)CH(3)I from [(11)C]CH(4).
  • To assess the impact of using [(11)C]CH(4) versus [(11)C]CO(2) on the specific radioactivity of various radiopharmaceuticals.

Main Methods:

  • Proton bombardment of N(2)-O(2) or N(2)-H(2) gaseous systems to produce [(11)C]CH(4).
  • Gas-phase iodination of [(11)C]CH(4) to yield [(11)C]CH(3)I.
  • Calculation of specific radioactivity (SA) for four different radiopharmaceuticals synthesized using both [(11)C]CO(2) and [(11)C]CH(4) precursors.

Main Results:

  • Successful production of [(11)C]CH(4) with high specific radioactivity.
  • Efficient gas-phase iodination of [(11)C]CH(4) to produce [(11)C]CH(3)I.
  • For [(11)C]raclopride, an average SA of 3908 GBq/μmol was achieved using the [(11)C]CH(4) precursor, representing a 32-fold increase compared to using [(11)C]CO(2).

Conclusions:

  • The production of [(11)C]CH(4) provides a superior precursor for radiopharmaceutical synthesis.
  • This new method significantly enhances the specific radioactivity of (11)C-labeled compounds, particularly [(11)C]raclopride.
  • The enhanced SA has profound implications for improving the sensitivity and efficacy of PET imaging agents.