title: NMR investigation of acrolein stability in hydroalcoholic solution as a foundation for the valid HS-SPME/GC-MS quantification of the unsaturated aldehyde in beverages.
abstract: Acrolein (propenal) is found in many foods and beverages and may pose a health hazard due to its cytotoxicity. Considerable knowledge gaps regarding human exposure to acrolein exist, and there is a lack of reliable analytical methods. Hydroalcoholic dilutions prepared for calibration purposes from pure acrolein show considerable degradation of the compound and nuclear magnetic resonance (NMR) spectroscopy showed that 1,3,3-propanetriol and 3-hydroxypropionaldehyde are formed. The degradation can be prevented by addition of hydroquinone as stabilizer to the calibration solutions, which then show linear concentration-response behaviour required for quantitative analysis. The stabilized calibration solutions were used for quantitative headspace solid-phase microextraction/gas chromatography-mass spectrometry (HS-SPME/GC-MS) determination of acrolein in alcoholic beverages with a detection limit of 14 μg L(-1). Of 117 tested alcoholic beverages, 64 were tested positive with the highest incidence in grape marc spirits and whiskey (100%, mean 252 μg L(-1)), followed by fruit spirits (86%, mean 591 μg/L(-1)), tequila (86%, mean 404 μg L(-1)), Asian spirits (43%, mean 54 μg L(-1)) and wine (9%, mean 0.7 μg L(-1)). Acrolein could not be detected in beer, vodka, absinthe and bottled water. Six of the fruit and grape marc spirits had acrolein levels above the World Health Organization (WHO) provisional tolerable concentration of 1.5 mg L(-1).
authors.affiliation: Chemisches und Veterinäruntersuchungsamt (CVUA) Karlsruhe, Weissenburger Strasse 3, D-76187 Karlsruhe, Germany; Hochschule Mannheim, Paul-Wittsack-Strasse 10, D-68163 Mannheim, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Kächele
authors.affiliation: Chemisches und Veterinäruntersuchungsamt (CVUA) Karlsruhe, Weissenburger Strasse 3, D-76187 Karlsruhe, Germany; Bruker Biospin GmbH, Silbersteifen, 76287 Rheinstetten, Germany; Department of Chemistry, Saratov State University, Astrakhanskaya Street 83, 410012 Saratov, Russia.
authors.forename: Yulia B
authors.initials: YB
authors.lastname: Monakhova
authors.affiliation: Chemisches und Veterinäruntersuchungsamt (CVUA) Karlsruhe, Weissenburger Strasse 3, D-76187 Karlsruhe, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Kuballa
authors.affiliation: Chemisches und Veterinäruntersuchungsamt (CVUA) Karlsruhe, Weissenburger Strasse 3, D-76187 Karlsruhe, Germany; Ministry of Rural Affairs and Consumer Protection, Kernerplatz 10, 70182 Stuttgart, Germany. Electronic address: lachenmeier@web.de.
authors.forename: Dirk W
authors.initials: DW
authors.lastname: Lachenmeier
mesh_terms: D000171:Acrolein / Q000032:analysis* / Q000737:chemistry* / Q000302:isolation & purification; D000434:Alcoholic Beverages / Q000032:analysis*; D002138:Calibration; D004355:Drug Stability; D008401:Gas Chromatography-Mass Spectrometry; D009682:Magnetic Resonance Spectroscopy; D052617:Solid Phase Microextraction; D012996:Solutions
chemical_list: D012996:Solutions; D000171:Acrolein
keywords: Acrolein; Beverages; Equilibrium; GC–MS; NMR; SPME