Preparation of technetium-99-DMS renal complex in solution and its chemical and biological characterization.

99Tc-DMS solution was prepared by double isotope labelling, purified by molecular sieving through Sepharose 2B column, and checked by chromatographic and spectrophotometric methods, as well as by assessment of its biodistribution in rats. The preparations, obtained in a series of nine experiments, showed high renal uptake (30-40% of injected dose per organ) and could be used for further investigations of Tc-DMS biochemical behaviour in kidney tissue at subcellular level. Radioactive concentrations of purified 99Tc-DNS preparations were 37-74 kBq/ml and absorption maxima at 412-425 nm (yellow complex). By application of 99mTc, 99Tc-DMS preparation in rats, good renal scans have been obtained.