Quality evaluation of sweet potato powder-enriched cereal products

The effects of wheat flour substitution by sweet potato powder on rheological parameters of wheat dough and physical parameters of cookies and crackers were analyzed. Wheat flour was substituted with sweet potato powder at level 2.5%, 5%, 7.5%, and 10%. Sweet potato powder was characterized by high water holding capacity (9.00 g/g) and swelling capacity (8.16 cm³/g). The addition of sweet potato powder significantly changed the rheological properties of wheat dough (water absorption and mixing tolerance index were increased, dough stability was reduced, and dough development time was prolonged). It was also found that volumes of cookies and crackers were decreased, and spread ratios were increased with the addition of sweet potato powder. Lightness of baked products decreased and yellowness increased with the addition of sweet potato powder. Incorporation of sweet potato powder significantly decreased the hardness of cookies and crackers. Sensory evaluation showed that the most acceptable cookies and crackers were the ones obtained after the addition of sweet potato powder at level 2.5% and 7.5%, respectively.