Švec, Ivan, Petríková, Eliška, Klitschová, Blanka, Skřivan, Pavel, Sluková, Marcela, and Polednová, Petra
In the bakery branch, several types of wheat flour (white, bread, wholegrain) and rye flour (bread and wholegrain) could be considered as basic raw materials. Owing to the different chemical composition, dough is built on the basis of gluten proteins in the first and on a complex of non-starch arabinoxylans and rye protein secalins in the latter. At a stage of dough manufacturing, water absorption has a direct impact on dough consistency and its behaviour during kneading. The volume of water added depends on the reciprocal proportion of proteins and nonstarch polysaccharides dietary fibre, which competes with just developing gluten. Replacing stepwise 10 wt.% of commercial wheat white flour by rye bread flour or by the rye wholegrain counterpart (WW, RB and RW, respectively), two sets of nine bicomponent blends together with those three controls were tested by use of the standard Farinograph proof. For water absorption within both the WW-RB and WW-RW subsets, a concave course of the determined values was observed. The WW control demonstrated value 57.5%, blends 30:70RB and 40:60RW the maximum (67.3% and 66.0%), and the RB control level 61.7%. For both dough development time and consistency stability, optima were recorded for the 50:50 mixture. Within the second subset, revealed trends were similar. By cluster analysis of flour and blends, a statistical similarity greater than 85% was verified between their chemical composition and technological quality. Farinograph water absorption was dependent on protein and dietary fibre content, while stability of dough consistency on protein content only. Blends with rye bread flour up to 40% are commonly used in breadmaking; clustering confirmed their statistical closeness to the quality of basic white wheat flour, based on a dominance of gluten proteins in the rheological properties. [ABSTRACT FROM AUTHOR]