Title: Online monitoring of the roaster off-gas during coffee roasting using proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS) : towards a real-time process control for a consistent roast profile
Authors : Wieland, Flurin
Glöss, Alexia
Keller, Marco
Schenker, Stefan
Yeretzian, Chahan
Conference details: Fall Meeting of the Swiss Chemical Society, ETH Zurich, Zurich, September 13, 2012
Issue Date: 2012
License (according to publishing contract) : Licence according to publishing contract
Type of review: Not specified
Language : English
Subject (DDC) : 663: Beverage technology
Abstract: The flavour of a freshly prepared cup of coffee is the final expression of a long chain of transformations. Along this journey from the seed to the cup, roasting is without doubt the most significant processing step. Here we report on the development of a fast on-line process control technology for a consistent roast, batch after batch. It involves the on-line monitoring of the roaster off-gas using Proton-Transfer-Reaction Time-of-Flight Mass-Spectrometry (PTR-ToF-MS) and the analysis of the mass spectral profiles via principle component analysis (PCA). This allows predicting the roast degree in real time. The PCA was calibrated in advance with a large number of roasting trials, to develop the predictive model. The 3D space of the three first principal components allows to predict in real time the roast degree, based on PTR-ToF-MS profiles of the roast gas. This work demonstrates that time resolved analysis of roaster off-gas provides a detailed picture of the evolution of the roasting process.
Departement: Life Sciences und Facility Management
Publication type: Conference Other
URI: https://digitalcollection.zhaw.ch/handle/11475/5511
Appears in Collections:Publikationen Life Sciences und Facility Management

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