再与氢碘酸(HI)发生取代反应生成碘甲烷(11CH3I)。11CH3I与前体D-半胱氨酸(D-CYS)在Sep Pak Plus C18柱上发生烷基化反应生成11C-D-MCYS。用NaH2PO4缓冲液将柱上的11C-D-MCYS淋洗到无菌瓶中。11C-D-MCYS未校正放化产率为(51±4)%(从11CH3I计算
n=4)
放化纯度
>
99%
总合成时间
1
2 min。PET显像结果显示
S180肉瘤组织高度摄取11C-D-MCYS
而炎症组织摄取11C-D-MCYS低
表明11C-D-MCYS在肿瘤显像方面具有一定潜力。
Abstract
In this work
we investigated the feasibility of automated synthesis of(S-[11C]-methyl)-D-cysteine(11C-D-MCYS) as positron emission tomography tracer for tumor imaging.11CH3I was prepared by substitution reaction of HI with 11CH3OH
which was obtained from the reaction of LiAlH4 with 11CO2.11C-D-MCYS was produced by 11C-methylation of the precursor D-cysteine with 11CH3I and purification on commercial Sep Pak C18 cartridges.The uncorrected radiochemical yield of 11C-D-MCYS from 11CH3I was over(51±4)%
the radiochemical purity of 11C-D-MCYS was more than 99%
and the total synthesis time was about 12 min.PET imaging studies showed that 11C-D-MCYS had high uptake in the S180 sarcoma-bearing tissues
but low uptake in inflammatory tissues.It seems that 11C-D-MCYS is a potential PET tracer for tumor imaging.