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Validation and application of a solid phase chemistry method for preparation of high effective specific activity
C H Kao1, K E Baidoo, S Z Lever
1Department of Environmental Health Sciences, Johns Hopkins University, School of Hygiene and Public Health, Baltimore, MD 21205-2179, USA.
Abstract:
Solid phase chemistry with UltraLink Iodoacetyl gel was investigated as a method for removing excess ligand present in preparations of diaminedithiol (DADT) 99mTc radiopharmaceuticals. The process was optimized and tested under 99mTc labeling conditions with 2,2,4,9,9-pentamethyl-4,7-diaza-1,10-decanedithiol (N-methyl-DADT), 1, and 4-(1-(2'-methoxyphenyl) piperazinylbutyl)-2,2,9,9-tetramethyl-4,7-diaza-1,10 -decanedithiol (DADT-4C-MPP), 2, a serotonin receptor-binding ligand. The results illustrated that this gel removed > or = 99.9% excess ligand used in labeling reactions, and was comparable to the level of purification usually obtained by the more labor intensive method of HPLC.