Rapid isocratic HPLC investigation of radiochemical purity for 90Y-DOTATATE

DOTA-conjugated peptides, such as [DOTA0, Tyr3]ocreotide (DOTATOC) and [DOTA0, Tyr3]octreotate (DOTATATE) can be labeled with radionuclides such as 90Y, 177Lu and 111In at high specific activities. These radiolabelled somatostatin analogues are used for peptide receptor radionuclide therapy (PRRT). Currently, radio-high performance liquid chromatography (radio-HPLC) and radio-thin layer chromatography (radio-TLC) are the methods of choice for the analysis of the labeled compounds. In literature, radiochemical purity of the radiolabelled DOTATATE was investigated using gradient reversed-phase radio-HPLC. However, these studies indicate long retention time of the radiolabelled compound of 14.52 min. In our study, a new simple and rapid reversed-phase isocratic system enables the radiochemical purity of the radiolabelled DOTATATE within a few minutes. (author)