A simple method for preparation of pure 68 Ga-acetate precursor for formulation of radiopharmaceuticals: Physicochemical characteristics of the 68 Ga eluate of the SnO2 based-68 Ge/68 Ga column generator

Abstract

Gallium-68 radioisotope is an excellent source in clinical positron emission tomography application due to its ease of availability from germanium-68 (⁶⁸ Ge)/gallium-68 (⁶⁸ Ga) generator having a shelf life of 1 year. In this paper, a modified method for purification of the primary eluate of ⁶⁸ Ge-⁶⁸ Ga generator by using a small cation exchange resin (Dowex-50) column has been described. The breakthrough of ⁶⁸ Ge before and after purification of ⁶⁸ Ga eluate was 0.014% and 0.00027%, respectively. The average recovery yield of ⁶⁸ Ga after purification was 84% ± 8.6% (SD, n = 335). The results of the physiochemical studies confirmed that the ⁶⁸ Ga-acetate obtained is suitable for labeling of radiopharmaceuticals.

Keywords: 68Ga-acetate; 68Ge-68Ga generator; Dowex-50 resin; Post purification; SnO2 column.