ABSTRACT
Flour samples from seven different barleys, including covered and naked barleys and barleys with normal, waxy, and high-amylose starches, as well as the high fiber barley Prowashonupana, were impact-milled and air-classified in a pilot unit. Six fractions (F1–F5 and C5) with increasing particle size were obtained from each barley. All fractions were analyzed for ash, protein, starch, dietary fiber, and total and unextractable β-glucan. Ash was enriched in C5; covered barleys (4.3–5.7% of dry matter) had a higher ash content than naked barleys (2.1–3.2%). Starch was enriched in F4 for normal and waxy barleys (72–79%) and in F3 for high-amylose barleys (72–75%). Protein was enriched in F1 (14–26%) for the different barleys. β-glucan was enriched in F5 and C5 (7–23%), Prowashonupana had the highest value. The extractability of β-glucan decreased with increasing particle size, probably because of lower amounts of endogenous β-glucanase and poorer availability of the substrate in larger particles.
