Effects of Grain and Malt β-Glucan on Distilling Quality in a Population of Hull-less Barley
2011
Swanston, J.S. | Middlefell-Williams, J.E. | Forster, B.P. | Thomas, W.T.B.
A population of barley lines, derived by mutation in the hull-less variety, Penthouse, was included in a replicated trial, along with Penthouse and the hulled malting cultivar, Optic. Samples were assessed for a range of grain quality traits, then malted, with germination for either 4 or 5 days, prior to kilning. Most lines had grain beta-glucan contents lower than that of Penthouse, but there was no significant correlation between grain and malt beta-glucan content. Malt beta-glucan levels were indicative of differences in cell wall breakdown between 4 and 5 days germination, but negative associations with distilling parameters Extract and Alcohol Yield, were not statistically significant. It was concluded that the lines differed in the rate and extent of cell wall breakdown and that grain shape may influence modification in distal parts of the grain. However, a malting regime, optimized to suit Optic may be less suited to discriminating between hullless lines of reasonable quality.
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