A peptide glucuronide (Exorphin C glucuronide) was labeled with Tc-99m using glucoheptonate (GH) as a bifunctional chelating agent. Scintigraphic imaging was performed in male Albino rabbits. Exorphin C glucuronide showed rapid and efficient labeling with Tc-99m using glucoheptonate as a bifunctional chelate. Results demonstrated that Tc-99m-GEG may be a useful new type of glucuronide derivative of peptides for diagnosis of some cancer diseases. (c) 2006 Elsevier Ltd. All rights reserved.