Investigation of the impact of Lupinus angustifolius L. flour on the rheological properties of wheat flour dough

Abstract

Purpose. To investigate the patterns of changing the rheological properties of the dough and laboratory baking, depending on the amount of flour from different varieties of lupine added to wheat flour. Methods. The baking quality was analyzed using an alveograph and farinograph. Results. Based on the evaluation of alveograph, farinograph and laboratory bread baking, the patterns of changing the rheological properties of the dough when adding lupine flour to wheat flour were determined. The share of lupine variety’s influenced on flour strength, elasticity and stretchability of the dough, elasticity index ranged from 1 to 4%, with flour concentration – 82–98%. On the basis of the obtained data of the regression equation for the dependencies between the alveographer parameters and the amount of lupine flour added to wheat one were determined. A linear relationship was established between the physical characteristics of dough and the concentration of lupine flour. The proportion of the lupine variety impact on the time of dough formation, rate of dough fluidizing, valorimetric estimation of the flour mixture was 4–18%, the concentration of lupine flour was 57–76%. The bread loaf volume was for 86% determined by the concentration of lupine flour and for 6% by lupine variety. Based on the regression equations between the physical properties of the dough and the concentration of lupine flour, an exponential, linear, and polynomial dependence were found. The linear dependence was revealed between the bread loaf volume and the concentration of lupine flour in a lupine-wheat mixture. Conclusions. The rheological properties of the dough, as well as the bread loaf volume, were most influenced by the concentration of lupine flour in lupine-wheat flour mixture (57–98%). The share of influence on these indicators of lupine varieties used in the study did not exceed 18%. The revealed regression equations between the concentration of lupine flour and the physical characteristics of the dough allow predic­ting their changes depending on the amount of lupine flour added to wheat flour.