Moisture sorption isotherm characteristics and Taguchi analysis of rice bran extraction parameters

Abstract

This work determined the moisture sorption isotherm of rice bran and investigated the effects of the pre‐treatment method, solvent type, solid–liquid ratio and soaping temperature on extract yield, total phenolic content, 2,2‐diphenyl‐1‐picrylhydrazyl radical‐scavenging activity assay and 2,2′‐azino‐bis antioxidant capacity assay of rice bran extract. The Taguchi method and L9 (34) orthogonal array were employed in this study. The sorption isotherms of rice bran showed a sigmoidal pattern and displayed type II of van der Waals adsorption. Adsorption and desorption data on rice bran were best fitted using the Henderson model among the six models tested at three temperatures. The net isosteric heat of desorption was higher than the net isosteric heat of adsorption. Based on the analysis of the signal‐to‐noise ratio, solvent selection effected the largest contribution to the overall performance. Confirmation experiments showed that the optimal combination that contained the four quality attributes was appropriate (error margin <5%) and reproducible. © 2016 Curtin University of Technology and John Wiley & Sons, Ltd.

Mathematical Modeling and Hysteresis of Sorption Isotherms for Paddy Rice Grains

“…These regions are the result of physicochemical processes, such as, the multilayers creation and the pores filling (0.2-0.4 region), followed by larger pores filling and solutes dissolution (0.6-0.7 region). Several researchers verified the same pattern in starchy products, including rice (Brett et al, 2009;Mousa et al, 2014;Chen et al, 2017;Purohit & Rao, 2017;Zhao et al, 2017).…”

Physical–chemical evaluation of flours from brewery and macauba residues and their uses in the elaboration of cookies

“…According to the European Pharmacopoeia classification, MC flour was categorized as a highly hygroscopic material due to its adsorption higher than 15% (w/w) at 25°C, meanwhile, MS and PM were considered as moderately hygroscopic as they reached adsorption values from 2% to 15% at a w = 0.80 at 25°C. due to its typical intermediate moisture (Brunauer et al, 1940;Chen et al, 2017;Galdeano et al, 2018) and is characteristic for nonporous materials or with pores that range from mesopores to macropores. The first inflection point of the isotherm, concave on the a w axis, represents the formation of the monolayer adsorbed on the surface, while the second point, convex on the a w axis, characterizes the adsorption of multiple layers on the surface (Gili et al, 2017;Rahman, 2009).…”