Title: Application of laser ionization mass spectrometry for on-line monitoring of volatiles in the headspace of food products : roasting and brewing of coffee
Authors : Zimmermann, Ralf
Heger, Hans Jörg
Yeretzian, Chahan
Nagel, Holger
Boesl, Ulrich
Published in : Rapid Communication in Mass Spetrometry
Volume(Issue) : 10
Issue : 15
Pages : 1975
Pages to: 1979
Publisher / Ed. Institution : Wiley
Publisher / Ed. Institution: New York
Issue Date: 1996
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Coffee; Mass spectrometry; Laser ionization
Subject (DDC) : 663: Beverage technology
Abstract: Resonance-enhanced multi-photon ionization time-of-flight mass spectrometry (REMPI/TOFMS) has been applied to the detection of volatiles in the headspace of brewed coffee and in the coffee roasting process-gas. A frequency quadrupled Nd:YAG laser (266 nm) was used for REMPI ionization (REMPI@266nm) of the volatiles in an effusive molecular beam inside the ion source of a linear TOF mass spectrometer. A special sampling system provided a time correlated sampling. Under these circumstances REMPI@266nm is highly selective for ionization of phenolic compounds. Several phenolic compounds, such as the flavour-active 4-vinylguaiacol, can be detected in the headspace of coffee brew as well as in the roast off-gas with the application of this approach. Moreover, the nitrogen heterocyclic compounds, indole and caffeine, were detected in both cases. During the roasting process the relative changes in concentration of some volatile components of coffee have been recorded by EMPI@266nm with a time resolution of 1 Hz. The different volatiles exhibit characteristic concentration profiles as a function of the roast time. These results demonstrate the applicability of REMPI-TOFMS for on-line monitoring of coffee processing technologies. Such an on-line monitoring technique is of particular interest for process-control purposes, e.g. quality-protection or feedback process control. For example, monitoring of off-gases from the coffee roast process or monitoring of certain unit operations during the instant-coffee manufacturing could be promising industrial applications.
Departement: Life Sciences und Facility Management
Publication type: Article in scientific Journal
DOI : 10.1002/(SICI)1097-0231(199612)10:15<1975::AID-RCM786>3.0.CO;2-X
ISSN: 1097-0231
URI: https://digitalcollection.zhaw.ch/handle/11475/5447
Appears in Collections:Publikationen Life Sciences und Facility Management

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