Efeito da temperatura de secagem sobre as propriedades físicas de grãos de feijão Caupi

Abstract

The objective of this work was to evaluate the effect of drying temperature on some physical properties of Caupi beans (Vigna unguiculata) as a function of different drying temperatures. To evaluate the effect of temperature, samples of Caupi bean grains of the BRS Imposing variety with initial moisture content of 0.209 (db) were dried in a forced air circulation oven at temperatures of 40, 50, 60, 70, 80 and 90 ° C until the final moisture content 0.123 (db). At the end of drying were determined: angle of repouse, bulk and unit density, electrical conductivity of the solution of the exudates of the grains and thousand grains weight. In adittion, the color was measured by mean of the L *, a * and b * coordinates and the total color difference were evaluated in relation to the lower drying temperature. According to the results obtained, it was observed that, except for the unit density, the drying air temperature significantly influenced the physical properties of the Caupi beans, causing an increase in the angle of repouse and electrical conductivity of the exudate solution, besides. Reduction of the thousand grains weight and the bulk density. It was also observed that the coordinates a * and b * decreased while the L * coordinate and the total color difference increased as the drying temperature was increased. In general, it was concluded that the increase of drying air temperature influenced the physical properties of the Caupi bean grains.