Abstract
It has previously been reported that the malting quality of barley is related to the amount of β-glucan dissolved at low pH under defined conditions. An infra red reflectance instrument, the ‘InfraAlyzer’, can be used to estimate this ‘acid-soluble’ β-glucan content of barley. This is a rapid test (approximately one min/sample) and is therefore suitable when screening for low soluble β-glucan in the early generations of malting quality breeding programmes. The relationship between predicted and measured values for soluble β-glucan differs from comparisons made for other quality components in forages, in that it is curvilinear rather than linear. A logarithmic transformation of the soluble β-glucan values, however, allows the current ‘InfraAlyzer’, which produces linear regressions only, to predict values for soluble β-glucan that correlate well (r = 0.87) with the measured results.
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