Published: Journal of Analytical Toxicology, Volume 22, Number 5, September 1998, pp. 363–366.
A New, Specific Method to Detect
Cyanide in Body Fluids, Especially Whole Blood, by Fluorimetry
D. Felscher and M. Wulfmeyer
This study shows a simple, rapid, and specific method for the quantitative determination of cyanide ion in body fluids, especially blood, by fluorimetry. It is based upon the transformation of cyanide ion into hydrocyanic acid, which then reacts with 2,3-naphthalenedialdehyde and taurine in a self-contained system. The 1-cyano-2-benzoisoindole derivate thus formed is suitable for fluorimetric measurement (lEX = 418 nm; lEM = 460 nm). The fluorescence intensity can be determined by spectrophotometry or by high-performance liquid chromatography (HPLC) with fluorescence detection. The detection limit is 0.002 µg/mL. Linearity was excellent from 0.002 to 1 µg/mL for spectrophotometry and from 0.002 to 5 µg/mL for HPLC with fluorescence detection. The coefficient of variation for repeatability was 8% or less. Thiocyanate and sulfide did not interfere, even at high concentrations (200 µg/mL). The method was applicable to whole blood, so it should be suitable for both clinical and forensic purposes.
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