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dc.contributor.authorZimmermann, Ralf-
dc.contributor.authorHeger, Hans Jörg-
dc.contributor.authorYeretzian, Chahan-
dc.contributor.authorNagel, Holger-
dc.contributor.authorBoesl, Ulrich-
dc.date.accessioned2018-04-23T08:35:46Z-
dc.date.available2018-04-23T08:35:46Z-
dc.date.issued1996-
dc.identifier.issn0951-4198de_CH
dc.identifier.issn1097-0231de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/5447-
dc.description.abstractResonance-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.de_CH
dc.language.isoende_CH
dc.publisherWileyde_CH
dc.relation.ispartofRapid Communications in Mass Spectrometryde_CH
dc.rightsLicence according to publishing contractde_CH
dc.subjectCoffeede_CH
dc.subjectMass spectrometryde_CH
dc.subjectLaser ionizationde_CH
dc.subject.ddc663: Getränketechnologiede_CH
dc.titleApplication of laser ionization mass spectrometry for on-line monitoring of volatiles in the headspace of food products : roasting and brewing of coffeede_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementLife Sciences und Facility Managementde_CH
zhaw.publisher.placeNew Yorkde_CH
dc.identifier.doi10.1002/(SICI)1097-0231(199612)10:15<1975::AID-RCM786>3.0.CO;2-Xde_CH
zhaw.funding.euNode_CH
zhaw.issue15de_CH
zhaw.originated.zhawYesde_CH
zhaw.pages.end1979de_CH
zhaw.pages.start1975de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume10de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
Appears in collections:Publikationen Life Sciences und Facility Management

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Zimmermann, R., Heger, H. J., Yeretzian, C., Nagel, H., & Boesl, U. (1996). Application of laser ionization mass spectrometry for on-line monitoring of volatiles in the headspace of food products : roasting and brewing of coffee. Rapid Communications in Mass Spectrometry, 10(15), 1975–1979. https://doi.org/10.1002/(SICI)1097-0231(199612)10:15<1975::AID-RCM786>3.0.CO;2-X
Zimmermann, R. et al. (1996) ‘Application of laser ionization mass spectrometry for on-line monitoring of volatiles in the headspace of food products : roasting and brewing of coffee’, Rapid Communications in Mass Spectrometry, 10(15), pp. 1975–1979. Available at: https://doi.org/10.1002/(SICI)1097-0231(199612)10:15<1975::AID-RCM786>3.0.CO;2-X.
R. Zimmermann, H. J. Heger, C. Yeretzian, H. Nagel, and U. Boesl, “Application of laser ionization mass spectrometry for on-line monitoring of volatiles in the headspace of food products : roasting and brewing of coffee,” Rapid Communications in Mass Spectrometry, vol. 10, no. 15, pp. 1975–1979, 1996, doi: 10.1002/(SICI)1097-0231(199612)10:15<1975::AID-RCM786>3.0.CO;2-X.
ZIMMERMANN, Ralf, Hans Jörg HEGER, Chahan YERETZIAN, Holger NAGEL und Ulrich BOESL, 1996. Application of laser ionization mass spectrometry for on-line monitoring of volatiles in the headspace of food products : roasting and brewing of coffee. Rapid Communications in Mass Spectrometry. 1996. Bd. 10, Nr. 15, S. 1975–1979. DOI 10.1002/(SICI)1097-0231(199612)10:15<1975::AID-RCM786>3.0.CO;2-X
Zimmermann, Ralf, Hans Jörg Heger, Chahan Yeretzian, Holger Nagel, and Ulrich Boesl. 1996. “Application of Laser Ionization Mass Spectrometry for On-Line Monitoring of Volatiles in the Headspace of Food Products : Roasting and Brewing of Coffee.” Rapid Communications in Mass Spectrometry 10 (15): 1975–79. https://doi.org/10.1002/(SICI)1097-0231(199612)10:15<1975::AID-RCM786>3.0.CO;2-X.
Zimmermann, Ralf, et al. “Application of Laser Ionization Mass Spectrometry for On-Line Monitoring of Volatiles in the Headspace of Food Products : Roasting and Brewing of Coffee.” Rapid Communications in Mass Spectrometry, vol. 10, no. 15, 1996, pp. 1975–79, https://doi.org/10.1002/(SICI)1097-0231(199612)10:15<1975::AID-RCM786>3.0.CO;2-X.


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