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Radiosynthesis of [18F]-flumazenil Using an Isotopic Approach.

Riptee Thakur¹, Aishwarya Kumar¹, Raman Kumar Joshi¹

¹Department of Neuroimaging and Interventional Radiology, National Institute of Mental Health and Neurosciences, Bengaluru, Karnataka, India.

Indian Journal of Nuclear Medicine : IJNM : the Official Journal of the Society of Nuclear Medicine, India

|January 10, 2025

Summary

Fluorine-18 flumazenil (¹⁸F) FMZ was synthesized using an isotopic approach. This method offers a more affordable alternative for producing this radiotracer for imaging Gamma-aminobutyric acid-A receptors.

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Area of Science:

Radiochemistry
Nuclear Medicine
Molecular Imaging

Background:

Fluorine-18 (¹⁸F) flumazenil (FMZ) is a radiotracer used in positron emission tomography (PET) imaging.
Its primary application involves visualizing and quantifying Gamma-aminobutyric acid-A receptors in the brain.

Purpose of the Study:

To synthesize ¹⁸F-FMZ utilizing an isotopic substitution method.
To establish a cost-effective synthesis route for ¹⁸F-FMZ.

Main Methods:

Radiolabeling of the FMZ precursor with ¹⁸F was performed at temperatures ranging from 110°C to 160°C for 10-30 minutes.
Purification was achieved using both cartridge-based and high-performance liquid chromatography (HPLC) methods.
Product stability was assessed in various solutions over a 4-hour period.

Keywords:

Flumazenil fluorine-18 gabba receptors isotopic exchange

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Main Results:

Radiolabeling efficiency was 16 ± 4% with cartridge purification and 10 ± 4% with HPLC purification.
High radiochemical purity was achieved, with 96.5 ± 1.8% for cartridge and 97.3 ± 1.4% for HPLC.
The specific activity of the synthesized ¹⁸F-FMZ was 120 ± 20 GBq/μmol.

Conclusions:

Successful synthesis of ¹⁸F-FMZ was demonstrated through an isotopic approach.
This method presents a viable and potentially cheaper alternative for the production of ¹⁸F-FMZ.
The synthesized tracer is suitable for imaging Gamma-aminobutyric acid-A receptors.