Influence of Substituting Regular and Waxy Barley Flour in Wheat Based Bread Quality

다국어 초록 (Multilingual Abstract)

Barley is a good source of dietary fiber, β-glucan, which confer a number of human health benefits. The properties of a white wheat bread could be changed by adding regular and waxy barley flour in small amounts to a white wheat bread recipe. The objectives were to replace wheat flour with different levels of regular and waxy barley flour, and to examine their effects on bread qualities. Barley grains, Sassal(SS) as regular andSachalssal(SCS) as waxy cultivars, were ground usinga hammer mill equipped with 0.8 mm screen. A commercial bread wheat flour (WF) was used as a base flour. The blends with three levels (10, 20, 30%) of barley flour substitution were prepared, and the baking process was followed by the AACC official 10-10A. When barley flour substitution increased, beta-glucan was significantly increased: the highest beta-glucan in the waxy barley flour blends (0.1% in WF, 1.91% in 30% SCS). While WF bread had the highest loaf volume, substituting 20% SS did not statistically (p<0.05) affect the loaf volume, however a significantly lower loaf volume at 30% barley flour. On the other hand, the loaf volume of SCS breads lowered significantly by substitution statistically. The hardness and chewiness increased by replacing barley flour from 10 to 30% progressively: a remarkable increase in adhesiveness at 30% SCS bread. From the results, substitution of 10% barley flour regardless of regular and waxy did not affect bread volume and firmness, being suitable to use 20% SS barley flour without a significant change in loaf volume. From the nutritional point of view, substituting barley flour up to 20% would be an effective way to increase the dietary fiber on white wheat based breads.