The influence of steep regime and germination period on the malting properties of some hull‐less barley lines |
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Authors: | J S Swanston J E Middlefell‐Williams |
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Affiliation: | The James Hutton Institute, Invergowrie, , Dundee, DD2 5DA UK |
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Abstract: | Following field trials in 2008 and 2010, six lines, derived by mutation in the hull‐less barley cultivar Penthouse, were selected to provide a range in grain β‐glucan content. These lines, along with Penthouse and the hulled, malting variety Optic, were then malted, using four different steeping regimes, with samples kilned after 3, 4 and 5 days of germination. The longest steep regime provided samples with optimum modification after 5 days of germination. Samples from the other steep regimes were under‐modified to varying degrees. In particular, the steeps with a single immersion gave poorly modified samples with low extracts and alcohol yields. One line, with low grain β‐glucan, gave higher alcohol yields than either Penthouse or Optic, following a regime comprising two short immersions and a single air‐rest, but there was no clear association, within the lines, between β‐glucan content and malting properties. Copyright © 2012 The Institute of Brewing & Distilling |
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Keywords: | alcohol yield β ‐glucan hull‐less barley malting modification steeping |
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