Substitution of wheat flour with hom nil rice flour affects physicochemical characteristics, antioxidant activities, and sensory acceptance of chinese steamed bread (mantou)

Abstract

This study investigated the effects of partial replacement of wheat flours with Hom Nil rice flour on the physicochemical characteristics, antioxidant activities, and sensory acceptance of chinese steam bread (Mantou). Mantou was made with wheat flours partially substituted with Hom Nil rice flour at the level of 0%, 10%, 20% and 30%. Colour parameters (lightness (L*), redness (a*) and yellowness (b*)) of Mantou were measured using a Hunter colorimeter and found that L* andb* values of Mantou decreased while a* value increased with increase in level of Hom Nil rice flour from 0 to 30%. Physical characteristics, including hardness, springiness, and cohesiveness, of Mantou were significantly affected with substitution due to the disruption of dough structure. The hardness of Mantou increased with the increasing of the Hom Nil rice flour substitution (0%-30%), in contrast with springiness and cohesiveness. The total phenolic/anthocyanin contents and antioxidant activities (DPPH, FRAP and ABTS) of Mantou increased with increasing Hom Nil rice flour level up to 30%. These results suggested that the substitution of 20 % Hom Nil rice flour would produce healthy and acceptable Mantou with higher total phenolic/anthocyanin contents and antioxidant activities.