title: Synthesis of pyruvate-1-11C as a radiopharmaceutical for tumor imaging.
abstract: Pyruvate-1-11C was prepared enzymatically by the exchange reaction of 11CO2 with the carboxyl group of pyruvic acid using pyruvate-ferredoxin oxidoreductase from Clostridium butyricum. 11C-Labeled pyruvate was purified by sublimation in specially made glassware. The radiochemical yield of pure pyruvate-1-11C was 80% 35 min after the end of bombardment. The distribution of 11C in tumor-bearing rabbits after an i.v. injection of pyruvate-1-11C was observed using a gamma camera. In contrast to normal organs, the tumor was positively visualized. We also conducted a number of successful clinical studies. A case of brain tumor which exhibited a positive image on positron-emission tomography (PET) using pyruvate-1-11C is presented.
mesh_terms: D000818:Animals; D001932:Brain Neoplasms / Q000000981:diagnostic imaging*; D002250:Carbon Radioisotopes; D005260:Female; D006801:Humans; D007553:Isotope Labeling / Q000379:methods; D008297:Male; D008875:Middle Aged; D009368:Neoplasm Transplantation; D009369:Neoplasms / Q000000981:diagnostic imaging*; D011773:Pyruvates / Q000138:chemical synthesis; D019289:Pyruvic Acid; D011817:Rabbits; D011877:Radionuclide Imaging; D014018:Tissue Distribution
chemical_list: D002250:Carbon Radioisotopes; D011773:Pyruvates; D019289:Pyruvic Acid