Molecular migration of konjac glucomannan and gum Arabic phase separation and its application in oil-water interfaces

摘要: Abstract Molecular migration of gum Arabic (GA) fragments was investigated, when thermodynamic phase separation occurred in mixtures konjac glucomannan (KGM) and GA at different concentrations. It has been quantitatively analyzed by GPC-MALLS. After reaching equilibrium, with the small molecular weight migrated into KGM-rich phase, resulting a decrease its relative content (from 13.58% to 0.05%) GA-rich phase. dyed fluorochrome, aggregations separated were recorded using fluorescence microscopy. When KGM fixed 0.4 wt%, increasing concentration led simultaneous formation larger aggregates GA. In process separation, amount coexisted decreased as function time. To collect phases, fractionated named FGA. FGA showed better interfacial properties than original GA, decreasing oil-water tension moduli adsorption layer. The proposed reason that fractions maintained which proved possess weight, contributed emulsifying capacity. So concentrated sample large high Optimized FGA-stabilized emulsions presented droplet size (around 20 μm), surface charge neutral pH (about −30 mV) stabilities under various range or NaCl concentration. Taken together, this paper provides flexible method for separating concentrating capability great potentials be applied developing new food ingredients.