Effects of Partial Replacement of Durum Wheat Re-Milled Semolina with Bean Flour on Physico-Chemical and Technological Features of Doughs and Breads during Storage

The 'Signuredda' bean is a local genotype of pulse with particular technological characteristics, cultivated in Sicily, Italy. This paper presents the results of a study to evaluate the effects of partial substitutions of durum wheat semolina with 5%, 7.5%, and 10% of bean flour to prepare durum wheat functional breads. The physico-chemical properties and the technological quality of flours, doughs, and breads were investigated, as well as their storage process up to six days after baking. With the addition of bean flour, the proteins increased, as did the brown index, while the yellow index decreased. The water absorption and dough stability according to the farinograph increased from 1.45 in FBS 7.5%, to 1.65 in FBS 10%, for both 2020 and 2021, and from 5% to 10% supplementation for water absorption. Dough stability increased from 4.30 in FBS 5%-2021 to 4.75 in FBS 10%-2021. According to the mixograph, the mixing time also increased. The absorption of water and oil, as well as the leavening capacity, were also examined, and results highlighted an increase in the amount of water absorbed and a greater fermentation capacity. The greatest oil uptake was shown with bean flour at 10% supplementation (3.40%), while all bean flour mixes showed a water absorption of approximately 1.70%. The fermentation test showed the addition of 10% bean flour significantly increased the fermentative capacity of the dough. The color of the crumb was darker, while the crust became lighter. During the staling process, compared with the control sample, loaves with greater moisture and volume, and better internal porosity were obtained. Moreover, the loaves were extremely soft at T0 (8.0 versus 12.0 N of the control). In conclusion, the results showed an interesting potential of 'Signuredda' bean flour as a bread-making ingredient to obtain softer breads, which are better able to resist becoming stale.