An ascorbate analog labeled with iodine-131, 6-deoxy- 6-[131I]iodo-L-ascorbic acid was prepared for evaluation as an in vivo tracer of L-ascorbic acid. The no-carrier-added radiosynthesis was conducted by nucleophilic bromine–iodine exchange between the brominated precursor and sodium [131I]iodide in 2-pentanone at 130–140°C. HPLC purification using a reverse-phase column gave 6-deoxy-6-[131I]iodo-L-ascorbic acid in radiochemical yield of 36–60% with high radiochemical purity and satisfactory-specific radioactivity in a total preparation time of 90 min. Biodistribution studies in fibrosarcoma-bearing mice showed a high uptake in the adrenal glands, accompanied by low activity of tumor accumulation, accumulation properties similar to previous results obtained with 14C-labeled ascorbic acid and 6-deoxy-6-[18F]fluoro-L-ascorbic acid, in spite of high level of deiodination. Copyright © 2009 John Wiley & Sons, Ltd.
制备了一种用
碘-131 标记的
抗坏血酸类似物--6-脱氧-6-[131I]
碘-L-
抗坏血酸,以作为 L-
抗坏血酸的体内示踪剂进行评估。在 130-140°C 的温度下,
溴化前体与 [131I]iodide
钠在 2-pentanone 中通过亲核
溴碘交换进行无载体放射性合成。使用反相色谱柱进行高效
液相色谱纯化,得到 6-脱氧-6-[131I]
碘-L-
抗坏血酸,其放射
化学收率为 36-60%,放射
化学纯度高,特异性放射性令人满意,总制备时间为 90 分钟。在罹患纤维肉瘤的小鼠体内进行的
生物分布研究表明,尽管脱
碘程度较高,但肾上腺对该物质的吸收率较高,肿瘤蓄积活性较低,蓄积特性与之前用 14C 标记的
抗坏血酸和 6-脱氧-6-[18F]
氟-L-
抗坏血酸得到的结果相似。Copyright © 2009 John Wiley & Sons, Ltd. All Rights Reserved.