lower b-glucan and SDF contents. Furthermore, the bglucan contents of CDC-Candle and Phoenix (6.5 and 3.9%, respectively) were higher than SDF contents (5.6 and 2.4%, respectively). This suggests that barley bglucan contained water-soluble as well as insoluble fractions. The water-solubility of b-glucan in the native and extruded flours is given in Table 2. The solubility (determined at 100 C) of native b-glucan was 79% for CDC-Candle and 57% for Phoenix, which suggests that the SDF of native flour might contain a large amount of b-glucan (91% in CDC-Candle and 93% in Phoenix).
The b-glucan in extruded flours had higher solubility(determined at 25 C) than its native counterparts(Table 2), and, at each extrusion temperature, the solubilityincreased with an increase in the extrusion-moisture level. The solubility differences between native CDC-Candle and Phoenix b-glucans may be attributed to the variety-dependent molecular variations, while the