Physico-chemical, hydration, cooking, textural and pasting properties of different adzuki bean (Vigna angularis) accessions

Abstract

Physico-chemical, hydration, cooking, textural and pasting properties of thirteen adzuki bean (Vigna angularis) accessions were studied. Protein and ash content ranged from 18.82 to 24.52% and 2.02 to 7.03%, respectively. Bulk density and seed weight of the adzuki seed ranged from 0.76 to 1.00 g/mL and 74.87 to 148.20 g/1000 seeds, respectively. Hydration capacity, swelling capacity and cooking time ranged from 0.05 to 0.12 g/seed, 0.04 to 0.15 mL/seed and 48.67 to 74.33 min, respectively. Different accessions showed significant variations in their physicochemical, cooking, hydration and texture properties. Swelling capacity showed significantly positive correlation with L* value. Hardness of soaked grain varied ranged between 68.67 and 120.25 N and had significant positive correlation with gumminess and chewiness. The springiness and chewiness of cooked seeds showed highly significant positive correlation. Peak viscosity, breakdown viscosity, final viscosity, setback viscosity and pasting temperature of adzuki bean flour ranged from 1979 to 2373 cP, 45 to 183 cP, 2954 to 4004 cP, 931 to 1666 cP and 75.02 to 78.27 °C, respectively. Peak viscosity and breakdown viscosity were negatively correlated to amylose content while setback viscosity showed positive correlation.