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001035303 1001_ $$0P:(DE-Juel1)169356$$aKrapf, Philipp$$b0$$ufzj
001035303 245__ $$aFully automated production of (((S)-1-carboxy-5-(6-([18F]fluoro)-2-methoxynicotinamido)pentyl)carbamoyl)-l-glutamic acid ([18F]JKPSMA-7
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001035303 520__ $$aThe radiotracer [18F]JK-PSMA-7, a prostate cancer imaging agent for positron emission tomography (PET), was previously synthesized by indirect radiofluorination using an 18F-labeled active ester as a prosthetic group, which had to be isolated and purified before it could be linked to the pharmacologically active Lys-urea-Glu motif. Although this procedure could be automated on two-reactor modules like the GE TRACERLab FX2N (FXN) to afford the tracer in modest radiochemical yields (RCY) of 18–25%, it is unsuitable for cassette-based systems with a single reactor. Methods: To simplify implementation on an automated synthesis module, the radiosynthesis of [18F]JK-PSMA-7 was devised as a one-pot, two-step reaction. The new method is based on direct (“late-stage”) radiofluorination of an appropriate onium triflate precursor and subsequent deprotection with ortho-phosphoric acid. It was successfully established on the cassette-based Trasis AllInOne (AIO) module. Results: Overall, the new protocol enabled the production of [18F]JK-PSMA-7 in activity yields of 39 ± 4%(RCY = 58%) with an overall synthesis time of about 1 h. In a single production run with an initial activity of 36-43 GBq, 13-19 GBq of [18F]JK-PSMA-7 with a radiochemical purity of >99%was obtained. Conclusions: We have established a highly reliable, GMP-compliant process for the automated radiosynthesis of [18F]JK-PSMA-7 on the Trasis AllinOne (AIO) synthesizer, ensuring consistent and efficient production of this radioligand.
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001035303 7001_ $$0P:(DE-Juel1)131853$$aWicher, Thomas$$b1
001035303 7001_ $$0P:(DE-Juel1)185610$$aZlatopolskiy, Boris$$b2$$ufzj
001035303 7001_ $$0P:(DE-Juel1)131818$$aErmert, Johannes$$b3$$ufzj
001035303 7001_ $$0P:(DE-Juel1)166419$$aNeumaier, Bernd$$b4$$eCorresponding author$$ufzj
001035303 773__ $$0PERI:(DE-600)2193542-7$$a10.3390/ph18010119$$gVol. 18, no. 1, p. 119 -$$n1$$p119 -$$tPharmaceuticals$$v18$$x1424-8247$$y2025
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