DefinePK

Abstract

The extraction of glucomannan from Porang flour was conducted simultaneously with starch hydrolysis using amylase. Only the extraction process is reported in this paper. The kinetic of the extraction was analyzed using second order kinetic model. The influence of two operating parameters, i.e. stirring speed and solid mass/volume ratio, were studied. The value of kinetic parameters, i.e. the initial extraction rate, h, extraction capacity, Ce, and the extraction rate constant, k, increased as stirring speed increased, i.e. 4.95 times, 2.5 times, and 1.4 times, respectively, as the stirring speed increased from 300 rpm to 600 rpm. The increase of solid mass/volume ratio from 2.67 to 10.7 g/L results in an increase in h (8.86 times) and Ce (3.26 times) but not in k, which decreased (by 0.833 times).