| Popis: |
Four hull-less barley samples were milled on a Buhler MLU 202 laboratory mill and individual and combined milling fractions were characterized. The best milling performance was obtained when the samples were conditioned to 14.3% moisture. Yields were 37–48% for straight-run flour, 47–56% for shorts, and 5–8% for bran. The β-glucan contents of the straight-run white flours were 1.6–2.1%, of which ≈49% was water-extractable. The arabinoxylan contents were 1.2–1.5%, of which ≈17% was water-extractable. Shorts and bran fractions contained more β-glucan (4.2–5.8% and 3.0–4.7%, respectively) and arabinoxylan (6.1–7.7% and 8.1–11.8%, respectively) than the white flours. For those fractions, β-glucan extractability was high (58.5 and 52.3%, respectively), whereas arabinoxylan extractability was very low (≈6.5 and 2.0%, respectively). The straight-run white flours had low α-amylase, β-glucanase, and endoxylanase activities. The highest α-amylase activity was found in the shorts fractions and the highest β... |
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