[18F]Fluoroacetaldehyde is a biocompatible prosthetic group that has been implemented pre-clinically using a semi-automated remotely controlled system. Automation of radiosyntheses permits use of higher levels of [18F]fluoride whilst minimising radiochemist exposure and enhancing reproducibility. In order to achieve full-automation of [18F]fluoroacetaldehyde peptide radiolabelling, a customised GE Tracerlab FX-FN with fully programmed automated synthesis was developed. The automated synthesis of [18F]fluoroacetaldehyde is carried out using a commercially available precursor, with reproducible yields of 26% ± 3 (decay-corrected, n = 10) within 45 min. Fully automated radiolabelling of a protein, recombinant human interleukin-1 receptor antagonist (rhIL-1RA), with [18F]fluoroacetaldehyde was achieved within 2 h. Radiolabelling efficiency of rhIL-1RA with [18F]fluoroacetaldehyde was confirmed using HPLC and reached 20% ± 10 (n = 5). Overall RCY of [18F]rhIL-1RA was 5% ± 2 (decay-corrected, n = 5) within 2 h starting from 35 to 40 GBq of [18F]fluoride. Specific activity measurements of 8.11–13.5 GBq/µmol were attained (n = 5), a near three-fold improvement of those achieved using the semi-automated approach. The strategy can be applied to radiolabelling a range of peptides and proteins with [18F]fluoroacetaldehyde analogous to other aldehyde-bearing prosthetic groups, yet automation of the method provides reproducibility thereby aiding translation to Good Manufacturing Practice manufacture and the transformation from pre-clinical to clinical production.
[18F]
氟乙醛是一种
生物相容性修复基团,已通过半自动遥控系统在临床前实施。放射合成的自动化允许使用更高
水平的[18F]
氟化物,同时最大限度地减少放射
化学家的暴露,并提高可重复性。为了实现[18F]
氟乙醛肽放射性标记的全自动化,我们开发了一套定制的通用电气 TRAcerlab FX-FN 全程序自动化合成系统。 [18F]
氟乙醛的自动合成是使用市售前体进行的,45 分钟内可重复产率为 26% ± 3(衰变校正,n = 10)。用[18F]
氟乙醛对
重组人白细胞介素-1 受体拮抗剂(rhIL-1RA)蛋白质进行全自动放射性标记的过程在 2 小时内完成。使用 HPLC 确认了 rhIL-1RA 与[18F]
氟乙醛的放射性标记效率,达到 20% ± 10(n = 5)。 从 35 到 40 GBq 的[18F]
氟化物开始,2 小时内[18F]rhIL-1RA 的总体 RCY 为 5% ± 2(衰变校正,n = 5)。比活度测量值为 8.11-13.5 GBq/µmol(n = 5),比使用半自动方法时提高了近三倍。 该策略可用于用[18F]
氟乙醛对一系列肽和蛋白质进行放射性标记,类似于其他含醛的修复基团,但该方法的自动化可提供可重复性,从而有助于转化为良好生产规范生产,并实现从临床前生产到临床生产的转变。