Background and objectives Black bean seed contains antinutritional factors that can be reduced or eliminated by seed treatments such as soaking and cooking. This study was carried out to determine the effect of cooked‐dried (cooking for 5–20 min; dried 50°C) and soaked‐dried (soaking for 6–24 hr; dried 50°C) treatments on the physical, milling, and flour qualities of black beans. Findings Feed rate was reduced up to 31% and 25% by cooked‐dried and soaked‐dried treatments, respectively. The decline in feed rate was attributed to increased seed size and decreased seed weight caused by cooked‐dried or soaked‐dried processes. Force needed to fracture the black bean seed decreased for both cooked‐dried and soaked‐dried seeds as treatment time increased. Fine‐particle flour yield declined with seed treatment. Cooked‐dried treatment was found to have the greatest impact on starch damage. However, cooking and soaking had little or no effect on total starch, protein, and ash contents. Conclusions Cooked‐dried and soaked‐dried treatments affected the size, weight, and fracture force of black bean seeds which subsequently affected milling and flour properties. Significance and novelty Limited research has been published, concerning the effect of cooking and soaking pretreatments on milling quality of black beans. Cooked‐dried and soaked‐dried pretreatments caused physical change in grain that must be considered when milling black beans into flour.
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