科研之友
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摘要
A new tridentate bifunctional chelator, N-(-2-picolyl)(-4-hydroxy)(-3-amino)benzoic acid (PHAB), was designed to efficiently coordinate the [Tc-99m(CO)(3)](+) core and facilitate coupling reactions to biomolecules. The chelator can be procured in the form of the corresponding benzotriazole ester (PHAB-OBT), which can be stored and used as a bioconjugation kit. PHAB-OBT reacts with modified carbohydrates with high selectivity and efficiency in a single step in both aqueous and organic media. As is desirable for a kit, no complicated chemical bench work is required. Glycoconjugate postlabeling resulted in neutral radiolabeled glycans with high radiochemical yields. Prelabeling approaches were assessed by successive reaction of PHAB-OBT with the [Tc-99m(CO)(3)](+) core and a modified galactose model. The radiolabeled galactose was obtained in 84% yield as defined by HPLC analysis. Biodistribution of the radioactive Tc-99m-labeled chelator, as well as the glycoconjugates, were examined in mice. Noticeably different biodistribution patterns were observed that reflect trends in the uptake of carbohydrate analogues by various organs.
- 出版日期2014-5-5
