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Syn/anti isomerization of 2,4-dinitrophenylhydrazones in the determination of airborne unsymmetrical aldehydes and ketones using 2,4-dinitrophenylhydrazine derivation

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Abstract

Aldehydes and ketones readily react with 2,4-dinitrophenylhydrazine (2,4-DNPH) to form the corresponding hydrazones. This reaction has been frequently used for the quantification of airborne carbonyl compounds. Since unsymmetrical aldehydes and ketones are known to form isomeric 2,4-dinitrophenylhydrazones (syn/ anti-isomers), the influence of isomerization on the practicability and accuracy of the 2,4-DNPH-method using 2,4-dinitrophenylhydrazine-coated solid sorbent samplers has been studied with three ketones (methyl ethyl ketone (MEK), methyl isopropyl ketone (MIPK), and methyl isobutyl ketone (MIBK)). With all three ketones the reaction with 2,4-DNPH resulted in mixtures of the isomeric hydrazones which were separated by HPLC and GC and identified by mass spectroscopy and 1H nuclear magnetic resonance spectroscopy. The isomers show similar Chromatographic behaviour in HPLC as well as in GC, thus leading to problems in quantification and interpretation of Chromatographic results.

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Authors and Affiliations

  1. Institut für Arbeitsmedizin, der Westfälischen Wilhelms-Universität Münster, Robert-Koch-Strasse 51, D-48149, Münster, Germany

    N. Binding, W. Müller & U. Witting

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  1. N. Binding
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  2. W. Müller
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  3. U. Witting
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Binding, N., Müller, W. & Witting, U. Syn/anti isomerization of 2,4-dinitrophenylhydrazones in the determination of airborne unsymmetrical aldehydes and ketones using 2,4-dinitrophenylhydrazine derivation. Fresenius J Anal Chem 356, 315–319 (1996). https://doi.org/10.1007/s0021663560315

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  • DOI: https://doi.org/10.1007/s0021663560315

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