In the last decade, microfluidic techniques have been explored in radiochemistry, and some of them have been implemented in preclinical production. However, these are not suitable and reliable for preparing different types of radiotracers or dose-on-demand production. A fully automated iMiDEV™ microfluidic radiosynthesizer has been introduced and this study is aimed at using of the iMiDEV™ radiosynthesizer with a microfluidic cassette to produce [11C]flumazenil and [11C]L-deprenyl. These two are known PET radioligands for benzodiazepine receptors and monoamine oxidase-B (MAO-B), respectively. Methods were successfully developed to produce [11C]flumazenil and [11C]L-deprenyl using [11C]methyl iodide and [11C]methyl triflate, respectively. The final products 1644 ± 504 MBq (n = 7) and 533 ± 20 MBq (n = 3) of [11C]flumazenil and [11C]L-deprenyl were produced with radiochemical purities were over 98% and the molar activity for [11C]flumazenil and [11C]L-deprenyl was 1912 ± 552 GBq/µmol, and 1463 ± 439 GBq/µmol, respectively, at the end of synthesis. All the QC tests complied with the European Pharmacopeia. Different parameters, such as solvents, bases, methylating agents, precursor concentration, and different batches of cassettes, were explored to increase the radiochemical yield. Synthesis methods were developed using 3–5 times less precursor than conventional methods. The fully automated iMiDEV™ microfluidic radiosynthesizer was successfully applied to prepare [11C]flumazenil and [11C]L-deprenyl.
在过去十年中,微流控技术在放射化学领域得到了探索,其中一些已应用于临床前生产。然而,这些技术对于制备不同类型的放射性racer或按剂量生产并不适用,也不可靠。本研究的目的是利用 iMiDEV™ 辐射合成器和微流控盒生产[11C]氟马西尼和[11C]L-去甲肾上腺素。这两种药物分别是苯并二氮杂卓受体和单胺氧化酶-B(MAO-B)的已知 PET 放射性配体。利用[11C]甲基碘和[11C]甲基三酸酯分别制备[11C]氟马西尼和[11C]L-去甲肾上腺素的方法已成功开发出来。最终合成的[11C]氟马西尼和[11C]L-去甲肾上腺素的放射性纯度分别为 1644 ± 504 MBq(n = 7)和 533 ± 20 MBq(n = 3),纯度均超过 98%,摩尔活度分别为 1912 ± 552 GBq/µmol和 1463 ± 439 GBq/µmol。所有质量控制测试均符合《欧洲药典》的要求。为了提高放射化学收率,我们研究了不同的参数,如溶剂、碱、甲基化剂、前体浓度和不同批次的盒。所开发的合成方法使用的前体比传统方法少 3-5 倍。全自动 iMiDEV™ 微流控放射合成仪已成功用于制备 [11C]flumazenil 和 [11C]L-deprenyl 。