The quality characteristics of dough and toast bread prepared with wheat flour containing different levels of Portulaca oleracea leaf powder

Abstract Rheological characteristics, i.e., farinograph and extensograph test in dough, specific-volume, hardness, sensory-properties, and the physicochemical-properties of toast-bread containing four levels (0-15%) of Portulaca oleracea leaf-powder (PLP) based on flour weight were determined. The water absorption and development-time of the dough sample increased with the addition of PLP. The increase in the PLP content in the dough sample from 10% to 15% showed significant differences in dough-stability. The energy and extensibility of dough increased for 5 and 10% and then decreased for 15% PLP substitution levels at dough resting time 45, 90, and 135 minutes after production. The specific-volume decreased and the pressure force reversely increased stepwise by 5 up to 15% dosage. Sensory-evaluation indicated that 10% of PLP in the bread is the most acceptable-level, more enriched-bread variants were less acceptable mainly owing to having less significant colour and sensory indices (p < 0.05), meanwhile dough water-absorption and specific-volume had no significant difference compared to less enriched bread samples (p > 0.05). As expected, the colour changed, too, from light brown (the control) to dark green (for 15% the PLP in bread). The moisture, dietary-fiber, protein, ash, and fat content significantly increased in the toast-bread, reflecting the enhancement levels.