A rapid and simple Sep Pak method for purification of radioiodinated IQNP,a high affinity ligand for the muscarinic receptor

A simplified procedure for the purification of 1-azabicyclo[2.2.2]oct-3-yl alpha-hydroxy-alpha- (1-iodo-1-propen-3-yl)-alpha-phenylacetate (IQNP) ster eoisomers utilizing a silica Sep Pak (SSP) is described. Iodine-131-E- and iodine-125-Z-(R,R)-IQNP were isolated after SSP purification in 80% and 75% radiochemical yields, respectively. The biodistribution of iodine-131-E-/i odine-125-Z-(R,R)-IQNP, purified either by SSP or high performance liquid c hromatography (HPLC), was evaluated in female rats and demonstrated no sign ificant differences in the uptake in various organs and cerebral regions, T he utilization of SSP thus affords a simple and rapid method for the purifi cation of IQNP for use in a variety of animal studies. NUCL MED BIOL 26;7:8 59-863, 1999. (C) 1999 Elsevier Science Inc. All rights reserved.