Study to assess physical properties of different types of kidney beans (Phaseolus vulgaris)

Abstract

Three different varieties of kidney beans (White speckled kidney beans, Red small kidney beans and Black kidney beans) were analysed in this study for their physical properties viz. dimensions (length, width, thickness), arithmetic mean diameter, geometric mean diameter, square mean diameter, equivalent diameter, sphericity, aspect ratio, volume, surface area, shape factor, bulk density, true density, porosity, thousand kernel mass and angle of repose. It was observed that length, width, thickness varied between 1.04-1.7, 0.66-0.79, 0.49-0.58 cm for three varieties of kidney beans, respectively. While the arithmetic mean diameter, geometric mean diameter, square mean diameter and equivalent diameter were 0.73-1.00, 0.70-0.96, 1.23-1.62, and 0.88-1.19 cm2, respectively. Sphericity and aspect ratio ranged between 0.56-0.67 and 0.45-0.64, respectively for the three varieties of kidney beans. Porosity (%) as a function of bulk density and true density were 2.21-9.07(%) respectively. Volume, surface area and shape Factor varied between 0.20-0.58, 1.53-3.47 and 0.88-1.015 cm, respectively. M1000 was lowest for red small kidney beans (240g) and highest for black kidney beans (499g). The angle of repose of three varieties of kidney bean ranged between 21.74-23.790.