Interaction of gum acacia and natural deep eutectic solvents: Effect on conductivity, thermal stability, compression, and stress relaxation properties

Abstract

The present study discussed the structure-function relationships of gum acacia and natural deep eutectic solvents (NADES) through interactive effects on physical, chemical, and rheological properties. Lactic acid, malic acid, glucose, and fructose-based NADES were prepared using the heating and stirring method. These NADES were mixed with 5 and 7 % gum acacia to obtain dispersion. The NADES-gum acacia dispersion was analysed using FTIR, DSC, compression extrusion test and rheometer to measure the change in physical, thermal, and rheological characteristics. The gum acacia dispersion with lactic acid, and malic acid NADES showed low pH with high conductivity and density. The dispersion with sugar NADES showed higher thermal stability than dispersion with acid NADES. FTIR showed that there was a strong interaction between gum acacia and NADES. The dispersion having sugar NADES showed higher peak force and energy than acid NADES. The dispersion showed non-Newtonian and pseudo-plastic behaviour and experimental data well fitted with Carreau-Yasuda model. The gum acacia with sugar NADES dispersions exhibited high zero share viscosity and relaxation time. Therefore, the present study manifested a tailoring approach for gum acacia dispersion according to the purpose to use.