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By means of laser microprobe mass analysis ( LAMMA ) platinum was detected in the renal proximal tubular cells of a dog that had been intravenously administered the antitumor drug cisplatin (5 mg per kg body weight). No definite subcellular localization of the heavy metal was obtained. Sample preparation and analytical features are examined to increase spatial resolution of analysis while maintaining sufficient detection efficiency. The LAMMA method is destructive, but the amount and type of evaporated material can readily be determined when using LAMMA in combination with transmission electron microscopy. Instrumental optimization and standardization of mass signals is possible by using platinum-loaded, ion-chelating resin beads embedded and sectioned with the tissue.
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