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Food Res Int

Title:		Evaluation of PTR-ToF-MS as a tool to track the behavior of hop-derived compounds during the fermentation of beer
Author(s):		Richter TM; Silcock P; Algarra A; Eyres GT; Capozzi V; Bremer PJ; Biasioli F;
Address:		"Department of Food Science, University of Otago, PO Box 56, Dunedin 9054, New Zealand. Department of Food Science, University of Otago, PO Box 56, Dunedin 9054, New Zealand. Electronic address: pat.silcock@otago.ac.nz. Department of Food Quality and Nutrition, Fondazione Edmund Mach, Instituto Agrario San Michele All'Adige, Via E. Mach, 1, 38010 S. Michele a/A, Italy. Department of the Sciences of Agriculture, Food and Environment, University of Foggia, Foggia, Italy"
Journal Title:		Food Res Int
Year:		2018
Volume:		20180523
Issue:
Page Number:		582 - 589
DOI:		10.1016/j.foodres.2018.05.056
ISSN/ISBN:		1873-7145 (Electronic) 0963-9969 (Linking)
Abstract:		"Hop-derived volatile organic compounds (VOCs) play an important role in the flavor and aroma of beer, despite making up a small percentage of the overall profile. To understand the changes happening during fermentation, proton transfer reaction-time of flight-mass spectrometry (PTR-ToF-MS) was applied for the first time in brewing science to directly measure the changes in hop-derived VOCs during the fermentation of four different worts containing one of two aroma hops in combination with one of two yeast biotypes. PTR-ToF-MS successfully detected and tracked mass-to-charge ratios (m/z) arising from interactions between the different yeast strains and the hop cultivars. Differences were observed in the dynamic VOC profiles between different beer treatments for m/z such as m/z 145.121 (ethyl hexanoate) and m/z 173.153 (isoamyl isovalerate or ethyl octanoate). The ability to monitor changes in VOCs during fermentation provides valuable information on the priority of production and transformation reactions by yeast"
Keywords:		Beer/*analysis Biomass Caprylates/analysis Carbon Dioxide/analysis Ethanol/analysis *Fermentation Food Handling Gas Chromatography-Mass Spectrometry/*methods Humulus/chemistry Mass Spectrometry/*methods Multivariate Analysis Odorants *Protons Reproducibil;
Notes:		"MedlineRichter, T M Silcock, P Algarra, A Eyres, G T Capozzi, V Bremer, P J Biasioli, F eng Canada 2018/07/17 Food Res Int. 2018 Sep; 111:582-589. doi: 10.1016/j.foodres.2018.05.056. Epub 2018 May 23"