代谢
在30-90分钟的成像窗口期间循环中的残留F 18主要是极性F 18代谢物。收集在尿液中的放射性物质基本上是florbetapir F 18的极性代谢物。已经发现并鉴定出三种代谢物,分别是[18F]AV-160(去甲基-[18F]AV-45)、[18F]AV-267(N-乙酰化-[18F]AV-160)和一个未确认身份的[18F]极性物种。此外,尽管代谢物可能对信号检测有一定贡献,尤其是非目标活性,但结论是这些放射性标记的代谢物对[18F]AV-45脑部PET图像中的淀粉样蛋白目标结合的干扰将是最小的(Wong等人,2010年)。
The residual F 18 in circulation during the 30-90 minute imaging window was principally in the form of polar F 18 metabolites. Essentially all radioactivity collected in the urine was present as polar metabolites of florbetapir F 18. Three metabolites have been discovered and identified as [18F]AV-160 (desmethyl-[18F]AV-45), [18F]AV-267 (N-acetyl–[18F]AV-160), and an [18F]-Polar species, the identity of which has not been confirmed. Additionally, although metabolites may make some contribution to signal detection, particularly to the nontarget activity, it is concluded that there will be minimal interference from these radiolabeled metabolites to the amyloid target binding in the [18F]AV-45 brain PET image (Wong et al, 2010).
来源:DrugBank