Abstract
Contents and enantiomeric distributions of linalool (3,7-dimethyl-1,6-octadien-3-ol) were investigated in raw and roasted cocoa beans (seeds of Theobroma cacao) of defined origin as well as in commercial products, such as cocoa powders or chocolates. The stereodifferentiation of linalool was achieved by enantioselective multidimensional gas chromatography using heptakis (2,3-di-O-methyl-6-O-tert-butyldimethylsilyl)-β-cyclodextrin as chiral stationary phase. Simultaneous steam distillation–extraction at pH 7 allowed sample preparation without racemization of linalool. Cocoa beans contain linalool primarily as (S)-enantiomer. Model experiments and analyses of commercial products such as cocoa powders and chocolates revealed that technological procedures employed in the manufacturing of cocoa products do not result in significant changes of the original enantiomeric distribution of linalool.
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Acknowledgments
The authors gratefully acknowledge Claudia Preis, Carsten Stein, and Lilian Simões dos Santos for their contribution and technical assistance in this work. We also thank the “Fraunhofer Institut für Lebensmitteltechnologie und Verpackung” (Freising, Germany), the “Bundesverband der Deutschen Süßwarenindustrie e.V.” (Köln, Germany), HACHEZ (Bremen, Germany), Kraft Jacobs Suchard R&D, Inc. (München, Germany), as well as the “Verein der am Rohkakaohandel beteiligten Firmen e.V.” (Hamburg, Germany) for donating defined cocoa samples.
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This paper is dedicated to Prof. Dr. Armin Mosandl (Dettelbach) on the occasion of his 70th birthday.
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Schmarr, HG., Engel, KH. Analysis and stereodifferentiation of linalool in Theobroma cacao and cocoa products using enantioselective multidimensional gas chromatography. Eur Food Res Technol 235, 827–834 (2012). https://doi.org/10.1007/s00217-012-1812-x
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DOI: https://doi.org/10.1007/s00217-012-1812-x