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Published December 16, 2005 | Supplemental Material
Journal Article Open

Multistep Synthesis of a Radiolabeled Imaging Probe Using Integrated Microfluidics


Microreactor technology has shown potential for optimizing synthetic efficiency, particularly in preparing sensitive compounds. We achieved the synthesis of an [^(18)F]fluoride-radiolabeled molecular imaging probe, 2-deoxy-2-[18F]fluoro-d-glucose ([^(18)F]FDG), in an integrated microfluidic device. Five sequential processes—[^(18)F]fluoride concentration, water evaporation, radiofluorination, solvent exchange, and hydrolytic deprotection—proceeded with high radio-chemical yield and purity and with shorter synthesis time relative to conventional automated synthesis. Multiple doses of [^(18)F]FDG for positron emission tomography imaging studies in mice were prepared. These results, which constitute a proof of principle for automated multistep syntheses at the nanogram to microgram scale, could be generalized to a range of radiolabeled substrates.

Additional Information

© 2005 American Association for the Advancement of Science. 15 August 2005; accepted 15 November 2005. Supported by the U.S. Department of Energy–funded Institute for Molecular Medicine laboratory, the National Cancer Institute, the Norton Simon Research Foundation, the UCLA SOMI training program, NIH training grant 5T32-GM07616, and a collaboration between Molecular Imaging/Siemens and Fluidigm. We thank H. Padgett at Siemens for his contribution in radiochemical experiments.

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