Assessment of chromatography separation parameters in the quality control of copper-64-labeled neurotensin-like peptides

In recent years, research on the Cu-64 effects on malignant tumours has increased, leading to the development of radiopharmaceuticals with higher selectivity, aiming to target tumour cells while preserving healthy body cells. This work aims to assess the quality of two DOTA-derivatized neuropeptides, NMN and NT (8-13) radiolabelled with Cu-64. An improved analytical radio-HPLC method was developed to evaluate the radiochemical purity and stability. The radiochemical purity is > 99.95% for both 64 Cu-DOTA-NMN and 64 Cu-DOTA-NT (8-13), the radiolabelled molecules being stable for 72 h after synthesis.