No abstract

Whole wheat bread is poor in quality, and it is necessary to use certain methods to improve bread texture and glycaemic index, such as adding exogenous protein. This study evaluated the effects of adding different proportions of gluten (focus on exogenous protein enrichment) on dough structure, bread quality, and starch digestibility, focusing on mixing properties, rheological properties, pasting properties, microstructure, basic quality, and starch digestibility. Dough microstructure results showed that gluten addition helped to form a more complete gluten network. The bread quality results showed that gluten-enriched bread had larger specific volume, lower baking loss, and better textural quality. Starch digestibility results showed that gluten addition slowed down starch digestion to some extent. The experimental results indicated that 40% added gluten could produce bread samples with optimal quality. The subject systematically studied the effect of gluten enrichment on the quality of whole wheat bread, which is a guide to the application.

Background Whole wheat bread is high in nutritional value but poor in technological quality; therefore, research on how to improve its technological quality has attracted extensive attention. The effects of fermentation methods, including straight dough(STD), sourdough (SOD), sponge dough (SPD), and refrigerated SPD (RSD) methods, on the dough and bread quality of whole wheat bread were investigated, focusing on pasting properties, rheological properties, thermal properties, microstructure, basic quality, and starch digestibility. Results The rapid viscosity analysis and rheological results demonstrated that SOD had the highest pasting temperature and the lowest viscosity, indicating an inhibition of starch pasting and partial protein hydrolysis, whereas the opposite trend presented by SPD and RSD indicated a greater starch hydration and a stronger gluten network. Thermal gravimetric analysis and differential scanning calorimetry results indicated reduced starch thermal degradation and increased starch pasting enthalpy in SOD and RSD. Scanning electron microscopy images revealed that the starch granules of SOD and RSD were tightly wrapped by a gluten network. SOD and RSD breads had the largest specific volume, the softest texture, and the lowest glycemic index. Conclusion The effects of different fermentation methods on dough and bread structure can provide instructive information for future studies on their applications in whole wheat bread production. © 2023 Society of Chemical Industry.