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Post-Digestion Stabilization of Osmium Enables Quantification by ICP-MS in Cell Culture and Tissue

Abstract

An orally active osmium anticancer compound was reliably quantified in organs of treated mice by inductively coupled plasma-mass spectrometry (ICP-MS) by adding a stabilizing solution consisting of ascorbic acid, thiourea and EDTA during sample preparation and avoiding oxidizing conditions. The limits of detection (LOD) and quantification (LOQ) of 189Os were determined in liver tissue to be 0.02 and 0.075 µg/kg, respectively. In spiked liver tissue, the internal precision showed a relative standard deviation (RSD) of 4%, a matrix recovery of 92% and a digestion recovery of 99%. A similar quantification protocol was developed for cellular accumulation studies in vitro. The cells were lysed with a non-oxidizing lysis buffer consisting of 150 mmol/L NaCl, 1.0% IGEPAL® CA-630, 0.1% SDS, and 50 mM Tris at pH 8.0 before adding the stabilizing solution. The osmium compound was compared to an isosteric ruthenium analogue and they displayed similar cellular accumulation and organ distribution profiles.

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Publication details

The article was received on 27 Feb 2017, accepted on 13 May 2017 and first published on 17 May 2017


Article type: Communication
DOI: 10.1039/C7AN00350A
Citation: Analyst, 2017, Accepted Manuscript
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    Post-Digestion Stabilization of Osmium Enables Quantification by ICP-MS in Cell Culture and Tissue

    M. H.M. Klose, M. Hejl, P. Heffeter, M. Jakupec, S. M. Meier, W. Berger and B. K. Keppler, Analyst, 2017, Accepted Manuscript , DOI: 10.1039/C7AN00350A

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