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L-[1-11C]leucine: routine synthesis by enzymatic resolution.
A new method synthesizes L-[1-11C]leucine for brain protein synthesis studies. Immobilized enzymes efficiently resolve enantiomers, yielding a pure, sterile product for positron emission tomography (PET) scans.
Area of Science:
- Biochemistry
- Radiochemistry
- Neuroscience
Background:
- Cerebral protein synthesis is crucial for brain function.
- Positron emission tomography (PET) requires radiolabeled tracers like L-[1-11C]leucine.
- Accurate determination of protein synthesis rates necessitates enantiomerically pure tracers.
Purpose of the Study:
- To develop a synthesis method for enantiomerically pure L-[1-11C]leucine.
- To enable precise measurement of cerebral protein synthesis rates using PET.
- To ensure a high-purity, sterile radiotracer suitable for human studies.
Main Methods:
- Modified Bucherer-Strecker reaction for initial synthesis.
- Immobilized D-amino acid oxidase/catalase enzyme complex on Sepharose for enantiomeric resolution.
- Semiautomated synthesis system for rapid production.
Main Results:
- Achieved radiochemical purity greater than 99% for L-[1-11C]leucine.
- Obtained a radiochemical yield of 25%.
- Production time of 30-40 minutes after H11CN preparation.
Conclusions:
- The developed method provides a reliable and efficient synthesis of enantiomerically pure L-[1-11C]leucine.
- Immobilized enzyme technology ensures a sterile, pyrogen-free product, suitable for PET imaging.
- This tracer facilitates accurate assessment of cerebral protein synthesis in humans.
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