Abstract
A practical and reliable HPLC method was used for the determination of 2-[4-N-(2-hydroxyethyl)-1-piperazinyl]-N′-ethanesulfonic acid (HEPES) content in the 68Ga-labeled [1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid]-1-Nal3-octreotide (DOTANOC). Linearity of this method was observed in a concentration range of 0.01–10 mg mL−1 and the quantitative limit (signal to noise = 11) was determined as 10 μg mL−1. The HEPES concentration in the final products of 68Ga-DOTANOC was typically lower than the detection limit. Pure water and HEPES buffer as reaction medium were investigated using various activities of gallium-68. It was demonstrated that the presence of HEPES buffer consistently furnished very high radiochemical purity of 68Ga-DOTANOC, which remained stable for several hours post-labeling. Evidence is provided that in addition to its role as a buffer, HEPES also functions as a radioprotectant agent.
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Acknowledgments
We thank Kobi Ben-Meir and Roni Michael for their assistance in the manufacture of the 68Ga-DOTANOC samples. R. Sasson and A. Bross gratefully acknowledge the IAEA for supporting their participation in the Gallium-68 workshop (2009) in Innsbruck, Austria.
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Sasson, R., Vaknin, D., Bross, A. et al. Determination of HEPES in 68Ga-labeled peptide solutions. J Radioanal Nucl Chem 283, 753–756 (2010). https://doi.org/10.1007/s10967-010-0449-0
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DOI: https://doi.org/10.1007/s10967-010-0449-0