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Determination of cyanide in blood by electrospray ionization tandem mass spectrometry after direct injection of dicyanogold

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Abstract

An electrospray ionization tandem mass spectrometric (ESI-MS-MS) method has been developed for the determination of cyanide (CN) in blood. Five microliters of blood was hemolyzed with 50 μL of water, then 5 μL of 1 M tetramethylammonium hydroxide solution was added to raise the pH of the hemolysate and to liberate CN from methemoglobin. CN was then reacted with NaAuCl4 to produce dicyanogold, Au(CN) 2 , that was extracted with 75 μL of methyl isobutyl ketone. Ten microliters of the extract was injected directly into an ESI-MS-MS instrument and quantification of CN was performed by selected reaction monitoring of the product ion CN at m/z 26, derived from the precursor ion Au(CN) 2 at m/z 249. CN could be measured in the quantification range of 2.60 to 260 μg/L with the limit of detection at 0.56 μg/L in blood. This method was applied to the analysis of clinical samples and the concentrations of CN in the blood were as follows: 7.13 ± 2.41 μg/L for six healthy non-smokers, 3.08 ± 1.12 μg/L for six CO gas victims, 730 ± 867 μg for 21 house fire victims, and 3,030 ± 97 μg/L for a victim who ingested NaCN. The increase of CN in the blood of a victim who ingested NaN3 was confirmed using MS-MS for the first time, and the concentrations of CN in the blood, gastric content and urine were 78.5 ± 5.5, 11.8 ± 0.5, and 11.4 ± 0.8 μg/L, respectively.

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Acknowledgments

This work was supported by a Grant-in-Aid for Scientific Research (number 22590631) from the Ministry of Education, Science, Sports and Culture of Japan.

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Correspondence to Kayoko Minakata.

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Published in the special issue Biomedical Mass Spectrometry with Guest Editors Hisao Oka and Mitsutoshi Setou.

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Minakata, K., Nozawa, H., Gonmori, K. et al. Determination of cyanide in blood by electrospray ionization tandem mass spectrometry after direct injection of dicyanogold. Anal Bioanal Chem 400, 1945–1951 (2011). https://doi.org/10.1007/s00216-011-4824-7

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  • DOI: https://doi.org/10.1007/s00216-011-4824-7

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