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Foods

Title:		Yeast Strain Influences the Hop-Derived Sensory Properties and Volatile Composition of Beer
Author(s):		Kumar A; Warburton A; Silcock P; Bremer PJ; Eyres GT;
Address:		"Department of Food Science, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand"
Journal Title:		Foods
Year:		2023
Volume:		20230302
Issue:		5
Page Number:		-
DOI:		10.3390/foods12051064
ISSN/ISBN:		2304-8158 (Print) 2304-8158 (Electronic) 2304-8158 (Linking)
Abstract:		"The perception of hop-derived flavour in beer is not well understood, particularly regarding the effect that different yeast strains and fermentation parameters have on perceived hop aroma and the mechanisms responsible for these changes. To evaluate the influence of yeast strain on the sensory properties and volatile composition of beer, a standard wort, late-hopped with New Zealand Motueka hops (5 g.L(-1)), was fermented with one of twelve yeast strains under constant conditions (temperature and yeast inoculation rate). The bottled beers were evaluated using a free sorting sensory methodology, and their volatile organic compounds (VOC) were assessed using gas chromatography mass spectrometry (GC/MS) with headspace solid-phase microextraction (SPME) sampling. Beer fermented with SafLager W-34/70 yeast was associated with a hoppy flavour attribute, whereas WY1272 and OTA79 beers were sulfury, and WY1272 was also metallic. WB06 and WLP730 beers were perceived to be spicy, with WB06 beer also perceived as estery, whereas VIN13 beer was sour, and the WLP001 beer was astringent. Beers fermented using the twelve yeast strains had clearly distinct VOC profiles. Beer made with WLP730, OTA29, SPH, and WB06 yeasts had the highest 4-vinylguaiacol levels, which contributed to their spicy attribute. Beer made with W3470 had high levels of nerol, geraniol, and citronellol, which supported its sensory characterisation as being 'hoppy'. This research has illustrated the important role that yeast strain has on modulating hop flavour in beer"
Keywords:		beer fermentation hops sorting task terpene biotransformation yeast strains;
Notes:		"PubMed-not-MEDLINEKumar, Ashly Warburton, Andrea Silcock, Patrick Bremer, Phil J Eyres, Graham T eng JP Dufour Scholarship/Emerson's Brewery/ Switzerland 2023/03/12 Foods. 2023 Mar 2; 12(5):1064. doi: 10.3390/foods12051064"