Moisture sorption characteristics and modelling of babool (Acacia nilotica) gum

Abstract

Figure 1 shows the effect of change in relative humidity in the storage atmosphere on the colour of babool gum samples when kept at a temperature of 50 °C. Five models of isotherm were considered in this study to fit the sorption data as presented in Table 2. Moisture sorption behaviour of babool gum under different experimental temperatures is presented in Fig. 2a. The sorption isotherm model parameters and statistical goodness of fit constants were found out in this experiment which is presented in Table 3. The value of monolayer moisture content of babool gum is determined and reported in Table 3. The isoster graph of babool gum samples at different moisture content obtained in this study is shown in Fig. 3a. The changes in net isosteric heat of sorption of babool gum with moisture content are presented in Fig. 3b.