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[en] The standard high pressure liquid chromatography (HPLC) method for determining radiochemical purity (RCP) of [131I]m-iodobenzylguanidine ([131I]m IBG) is cumbersome and time-consuming. A simplified and rapid separation method with the use of a reverse-phase extraction chromatography technique (i.e. Sep-Pak[reg] C18 [SPC] cartridge) is described. The new SPC system closely correlates (r = 0.99) to the standard HPLC method, and the time to complete the SPC analysis is less than 5 min
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