A fully automated synthesis of [<sup>18</sup>F]-FEAU and [<sup>18</sup>F]-FMAU using a novel dual reactor radiosynthesis module
作者:Vincenzo Paolillo、Stefan Riese、Juri G. Gelovani、Mian M. Alauddin
DOI:10.1002/jlcr.1674
日期:2009.11
2′-Deoxy-2′-[18F]fluoro-5-substituted-1-β-D-arabinofuranosyluracils, including 2′-deoxy-2′-[18F]fluoro-5-methyl-1-β-D-arabinofuranosyluracil [18F]FMAU and [18F]FEAU are established radiolabeled probes to monitor cellular proliferation and herpes simplex virus type 1 thymidine kinase (HSV1-tk) reporter gene expression with positron emission tomography. For clinical applications, a fully automated CGMP-compliant radiosynthesis is necessary for production of these probes. However, due to multiple steps in the synthesis, no such automated synthetic protocols have been developed. We report here a fully automated synthesis of [18F]-FEAU and [18F]-FMAU on a prototype dual reactor module TRACERlab FX FN. The synthesis was performed by using a computer-programmed standard operating procedure, and the product was purified on a semipreparative high-performance liquid chromatography (HPLC) integrated with the synthesis module using 12% EtOH in 50 mM Na2HPO4. Finally, the percentage of alcohol was adjusted to 7% by adding Na2HPO4 and filtered through a Millipore filter to make dose for human. The radiochemical yield on the fluorination was 40±10% (n=10), and the overall yields were 4±1% (d. c.), from the end of the bombardment; [18F]FEAU (n=7) and [18F]FMAU (n=3). The radiochemical purity was >99%, specific activity was 1200–1300 mCi/µmol. The synthesis time was 2.5 h. This automated synthesis should be suitable for production of [18F]FIAU, [18F]FFAU, [18F]FCAU, [18F]FBAU and other 5-substitued thymidine analogues. Copyright © 2009 John Wiley & Sons, Ltd.
2′-脱氧-2′-[18F]氟-5-取代-1-β-D-阿拉伯呋喃糖基尿嘧啶、包括 2′-脱氧-2′-[18F]氟-5-甲基-1-β-D-阿拉伯呋喃糖基尿嘧啶 [18F]FMAU 和 [18F]FEAU 是成熟的放射性标记探针,可通过正电子发射断层扫描监测细胞增殖和单纯疱疹病毒 1 型胸苷激酶(HSV1-tk)报告基因的表达。在临床应用中,生产这些探针需要符合 CGMP 标准的全自动放射合成工艺。然而,由于合成过程中存在多个步骤,目前尚未开发出此类自动合成方案。我们在此报告在双反应器原型模块 TRACERlab FX FN 上全自动合成 [18F]-FEAU 和 [18F]-FMAU 的情况。合成是通过计算机编程的标准操作程序进行的,产物在与合成模块集成的半分离高效液相色谱(HPLC)上用 12% EtOH 在 50 mM Na2HPO4 中进行纯化。最后,通过添加 Na2HPO4 将酒精比例调整为 7%,并通过密理博滤器过滤,以制成人体剂量。从轰击结束算起,[18F]FEAU(n=7)和[18F]FMAU(n=3)的氟化放射化学收率为 40±10%(n=10),总收率为 4±1%(d.c.)。放射性纯度大于 99%,比活度为 1200-1300 mCi/µmol。这种自动合成方法适用于生产[18F]FIAU、[18F]FFAU、[18F]FCAU、[18F]FBAU和其他5-取代胸苷类似物。版权所有 © 2009 John Wiley & Sons, Ltd. 保留所有权利。