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Quantitation of benzene in flavourings and liquid foods containing added cherry-type flavour by a careful work-up procedure followed by a stable isotope dilution assay

  • Stephanie FrankEmail author
  • Thomas Hofmann
  • Peter Schieberle
Original Paper

Abstract

The exposure of humans to the aromatic hydrocarbon benzene should be minimized due to its carcinogenicity. Previous studies have reported on the presence of benzene, in particular in foods with added cherry aroma compounds, in particular benzaldehyde. To allow a reliable quantitation of benzene, a stable isotope dilution assay using (2H3)benzene as the internal standard was developed and solid phase microextraction (SPME) was used for volatile isolation followed by GC × GC–TOFMS analysis. Care was taken to avoid any exposure to light and to use materials during work-up, which were free of benzene contamination. The method, applied on 22 liquid foods with added flavour showed that benzene did not exceed a concentration of 1 µg/L in any sample (i.e. the limit established for drinking water). Furthermore, flavourings containing benzaldehyde and the corresponding raw material were analysed. The major source of benzene in flavourings turned out to be benzaldehyde itself. First insights into parameters supporting the formation pathway of benzene from benzaldehyde were obtained indicating that the presence of light and either acidic or alkaline conditions favoured benzene formation.

Keywords

Benzene quantitation Stable isotope dilution assay Solid phase microextraction Liquid flavoured food Flavouring Light exposure 

Notes

Acknowledgements

The authors thank L. Romanski, I. Otte, and S. Kaviani-Nejad for excellent technical assistance.

Funding

This research project was supported by the German Ministry of Economics and Energy (via AiF) and the FEI (Forschungskreis der Ernährungsindustrie e.V., Bonn). Project AiF 18813 N.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Compliance with ethics requirements

This article does not contain any studies with human or animal subjects.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Stephanie Frank
    • 1
    Email author
  • Thomas Hofmann
    • 1
  • Peter Schieberle
    • 2
  1. 1.Leibniz-Institut für Lebensmittel-Systembiologie an der Technischen Universität München (formerly Deutsche Forschungsanstalt für Lebensmittelchemie)FreisingGermany
  2. 2.Fakultät für ChemieTechnische Universität MünchenGarchingGermany

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