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  • Title: Evaluation of stannous oxidation in the preparation of ultrahigh-purity 99m Tc(V)-DMSA.
    Author: Kumar V.
    Journal: Nucl Med Commun; 2001 Nov; 22(11):1261-6. PubMed ID: 11606894.
    Abstract:
    It has been shown previously that renal kit, trivalent technetium-99m dimercaptosuccinic acid [99mTc(III)-DMSA], can be transformed into tumour imaging agent, pentavalent technetium-99m DMSA [99mTc(V)-DMSA], by adding sodium bicarbonate (NaHCO3) and subsequently bubbling with oxygen. However, the purity of this pentavalent preparation was reported to be in the range 83-94% at best. In this study, the preparation of ultrahigh-purity 99mTc(V)-DMSA is described, and the role of stannous oxidation in the conversion of 99mTc(III)-DMSA to 99mTc(V)-DMSA is evaluated in order to understand the underlying mechanism. The results show that controlled oxygen bubbling increases the 99mTc(V)-DMSA levels, with a concomitant decrease in the 99mTc(III)-DMSA levels, in a time-dependent pattern. The purity of the pentavalent DMSA is shown to be consistently very high (>99%), as estimated by chromatography, and this correlates very well with the minimal or no renal uptake of this compound in patient studies.
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