Interfacial behavior and emulsion stability of a neutral polysaccharide extracted from Mesona chinensis Benth

Previous studies have shown that Mesona chinensis Benth polysaccharide (MP) has a variety of physiological activities, including anti-inflammation, anti-oxidation, immune regulation, etc. In addition, MP can also enhance the gel properties of starch. However, there are few reports about the interfacial properties and long-term emulsion stability of MP. In this study, we measured adsorption kinetics of MP molecules on the oil-water interface, interfacial viscoelasticity and adsorption mass, interfacial film thickness, the resistance of the interfacial film to external perturbations, and droplet size, zeta-potential, viscosity and long-term stability of MP-stabilized emulsion under different pH values. The results represented that MP could form much thicker and more elastic interfacial films on the oil-water interface under pH7 and pH9 conditions than that under pH5 condition. Besides, this interfacial film has stronger resistance to external perturbations, which is very significant for the long-term emulsion stability. This study explores the stability mechanism and application of MP in emulsion, which has a positive effect on expanding the application scene and scope of MP.