Preparation and Analysis of 4-lodoantipyrine-(I131)
4-Iodoantipyrine was prepared from antipyrine according to the reaction equation:
The product was separated from the reaction mixture and purified by recrystallization. The iodoantipyrine was labeled with I131 by means of an exchange reaction with NaI131. It was separated from the unbound radioactivity by anion exchange chromatography.
The purity of the product was determined by cellulose thin layer chromatography using ethanol-chloroform-water (45:45:10) as the solvent system. The purity of the 4-iodoantipyrine-I131 decreased with time due to a splitting off of the I131 atom and subsequent formation of NaI131. This spontaneous deiodination was best minimized by storage in methanol at low temperatures.
- © 1972 American Heart Association, Inc.