PubMed · 8917203
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C Decristoforo, G Riccabona. 1996. Problems with fractionated cold kits.. https://pubmed.ncbi.nlm.nih.gov/8917203/
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A method of quantitating Sn(II) suitable for the analysis of kits for 99mTc radiopharmaceuticals, based on a spectrophotometric determination using the Pd(II)-Sn(II) complex (yellow species) is described. The absorbance of the complex is measured at 410 nm and Beer's law is obeyed up to 250 micrograms Sn(II) in the aqueous phase. Several radiopharmaceutical kits were analyzed for their Sn(II) content. The investigation indicates that the procedure is simple, rapid and accurate for quantitative estimation of Sn(II) in various 99mTc-labelling kits during development, manufacture and storage.
Electronic structure calculations using the local-density functional method were shown to accurately reproduce the geometry of five oxo-Tc (V)-based radiopharmaceuticals containing a variety of donor ligands. Calculations were performed using the DGauss program on a Cray C90 supercomputer, requiring approximately 40 CPU h for each molecule. The predicted bond lengths were within +/- 0.04 A of the crystallographic coordinates, and bond angles within +/- 4 degrees. Root mean square (RMS) deviations between the predicted and crystallographic coordinates were less than 0.06, and visual inspection demonstrated nearly perfectly superimpossible structures.
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