Radiosynthesis and preliminary biodistribution in mice of 6‐deoxy‐6‐[131I]iodo‐L‐ascorbic acid |
| |
Authors: | Jintaek Kim Fumihiko Yamamoto Satoru Karasawa Takahiro Mukai Minoru Maeda |
| |
Institution: | Graduate School of Pharmaceutical Sciences, Kyushu University, 3‐1‐1 Maidashi, Higashi‐ku, Fukuoka 812‐8582, Japan |
| |
Abstract: | 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. |
| |
Keywords: | 6‐deoxy‐6‐[131I]iodo‐L‐ascorbic acid nucleophilic bromine– iodine exchange mice adrenal glands fibrosarcoma |
|
|