Title: Laser mass spectrometry as on-line sensor for industrial process analysis : process control of coffee roasting
Authors : Dorfner, Ralph
Ferge, Thomas
Yeretzian, Chahan
Kettrup, Antonius
Zimmermann, Ralf
Published in : Analytical Chemistry
Volume(Issue) : 76
Issue : 5
Pages : 1386
Pages to: 1402
Publisher / Ed. Institution : American Chemical Society
Publisher / Ed. Institution: Columbus
Issue Date: 22-Jan-2004
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Roasting; Sensory; Coffee; Flavor
Subject (DDC) : 663: Beverage technology
Abstract: The objective of the project is to develop on-line, real-time, and noninvasive process control tools of coffee roasting that help deliver a consistent and high-quality coffee aroma. The coffee roasting process was analyzed by direct injection of the roaster gas into a time-of-flight mass spectrometer and ionized either by resonance enhanced multiphoton ionization (REMPI) at 266 and 248 nm or vacuum ultraviolet single-photon ionization (VUV-SPI) at 118 nm. The VUV ionization scheme allows detecting mainly the most volatile and abundant compounds of molecular mass below 100 m/z, while REMPI ionizes mainly aromatic compounds of molecular mass larger than 100 m/z. Combining the compounds ionized by resonant and single-photon ionization, approximately 30 volatile organic compounds are monitored in real time. Time-intensity profiles of 10 important volatile coffee compounds were discussed in connection with their formation chemistry during roasting. Applying multivariate statistics (principle component analysis) on time-intensity traces of nine volatile coffee compounds, the roasting degree could be traced as a consistent path in the score plot of the two most significant principle components (including 68% of the total variance), for a range of roasting temperatures (200-250 degrees C).
Departement: Life Sciences und Facility Management
Organisational Unit: Institute of Chemistry and Biotechnology (ICBT)
Publication type: Article in scientific Journal
DOI : 10.1021/ac034758n
ISSN: 1520-6882
URI: https://digitalcollection.zhaw.ch/handle/11475/5467
Appears in Collections:Publikationen Life Sciences und Facility Management

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