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Heide, J.* ; Czech, H. ; Ehlert, S.* ; Koziorowski, T.* ; Zimmermann, R.

Towards smart online coffee roasting process control: Feasibility of real-time. prediction of coffee roast degree and brew antioxidant capacity by single-photon ionization mass spectrometric monitoring of roast gases.

J. Agric. Food Chem. 68, 4752-4759 (2020)
Verlagsversion Postprint Forschungsdaten DOI
Open Access Green
Precise controlling and monitoring the status of the coffee roasting process is essential for consistent product quality and optimization toward targeted coffee properties. In small-scale roasting experiments, the chemical composition of the roasting offgas was analyzed by online single-photon ionization time-of-flight mass spectrometry (SPI-TOFMS) at 118 nm with 5 s time resolution. Subsequently, mass spectra at the drop of the coffee beans were combined with off-line measurements of roast degree, described by color value "Colorette", and the antioxidant capacity, obtained from the Folin-Ciocalteu (FC) assay, in an explanatory projection on latent structure regression model. While the roast degree gives an indication of the coffee flavor, antioxidants in brewed coffee are regarded as beneficial for human health. Colorette and FC values could be derived from the SPI mass spectra with root-mean-square errors from Monte Carlo cross-validation of 6.0 and 139 mg of gallic acid equiv L-1, respectively, and explained covariance (R-2(CV)) better than 89%. Finally, the regression models were applied to the SPI mass spectra over the entire roast to demonstrate the predictive ability for online process control in real time.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Photoionization Mass Spectrometry ; Colorette ; Fc Assay ; Polyphenols ; Process Control; Near-infrared Spectroscopy; Enhanced Multiphoton Ionization; Maillard Reaction; Flavor Formation; Analytical Tool; Regression; Headspace; Ms; Quantification; Volatiles
ISSN (print) / ISBN 0021-8561
e-ISSN 1520-5118
Quellenangaben Band: 68, Heft: 17, Seiten: 4752-4759 Artikelnummer: , Supplement: ,
Verlag American Chemical Society (ACS)
Verlagsort 1155 16th St, Nw, Washington, Dc 20036 Usa
Begutachtungsstatus Peer reviewed