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Responsive Emulsion Gels with Tunable Properties Formed by Self-Assembled Nanofibrils of Natural Saponin Glycyrrhizic Acid for Oil Structuring.
Journal of Agricultural and Food Chemistry 2017 March 23
Saponin nanofibrils assembled from natural glycyrrhizic acid (GA) have been recently shown to be an effective structurant for edible oil structuring. This work showed that the microstructure and mechanical properties of the novel emulsion gels formed by GA fibrils could be well tuned by oil phase polarity. For more polar oils (algal oil), the GA fibrils had a higher affinity to the oil-water interface, showing a faster adsorption kinetics, thus leading to the formation of fine multilayer emulsion droplets with smaller droplet size. Accordingly, the emulsion gels had a denser network microstructure and higher mechanical strength, which should be attributed to the fact that the smaller emulsion droplets could be packed more tightly within the continuous network, providing stronger interdroplet interactions, and thereby contribute to reinforcing the gel matrix. In addition, all emulsion gels had interesting thermoresponsive behavior, independent of oil phase, which is probably due to the thermoreversibility of the hydrogen-bond fibrillar network in the continuous phase.
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