Labelling with reactor produced 18F—III.(1) Polymer supported 18F as a fluorinating agent

A historical perspective on the specific activity of radiopharmaceuticals: what have we learned in the 35 years of the ISRC?

Specific activity (SA), defined as the amount of radioactivity per unit mass of a compound, is arguably one of the most important parameters in radiopharmaceutical development, particularly in quality control of carbon-11- and fluorine-18-labeled compounds. This review article will outline the progression of improvements in SA over the last few decades. The International Symposium of Radiopharmaceutical Chemistry abstracts were an excellent source of materials for this review and will be referenced throughout.

Synthesis of 18F-labeled 6- and 7-fluoropalmitic acids

In order to investigate the uptake characteristics of palmitic (hexadecanoic) acid labeled with 18F at positions within the alkyl chain, [18F]6- and 7-fluoropalmitates were synthesized. A precursor synthesis of several steps was followed by no-carrier-added [18F] fluoride displacement of a methanesulfonate group and cleavage of the fatty acid benzyl ester. Preliminary myocardial uptake characteristics of the labeled compounds in rats were not markedly different from those of unsubstituted 11C labeled palmitic acid.