title: Effect of High Pressure Homogenization on the Physicochemical Properties of Natural Plant-based Model Emulsion Applicable for Dairy Products.
abstract: In the dairy industry, natural plant-based powders are widely used to develop flavor and functionality. However, most of these ingredients are water-insoluble; therefore, emulsification is essential. In this study, the efficacy of high pressure homogenization (HPH) on natural plant (chocolate or vanilla)-based model emulsions was investigated. The particle size, electrical conductivity, Brix, pH, and color were analyzed after HPH. HPH significantly decreased the particle size of chocolate-based emulsions as a function of elevated pressures (20-100 MPa). HPH decreased the mean particle size of chocolate-based emulsions from 29.01 μm to 5.12 μm, and that of vanilla-based emulsions from 4.18 μm to 2.44 μm. Electrical conductivity increased as a function of the elevated pressures after HPH, for both chocolate- and vanilla-based model emulsions. HPH at 100 MPa increased the electrical conductivity of chocolate-based model emulsions from 0.570 S/m to 0.680 S/m, and that of vanilla-based model emulsions from 0.573 S/m to 0.601 S/m. Increased electrical conductivity would be attributed to colloidal phase modification and dispersion of oil globules. Brix of both chocolate- and vanilla-based model emulsions gradually increased as a function of the HPH pressure. Thus, HPH increased the solubility of plant-based powders by decreasing the particle size. This study demonstrated the potential use of HPH for enhancing the emulsification process and stability of the natural plant powders for applications with dairy products.
authors.affiliation: Department of Marine Food Science and Technology, Gangneung-Wonju National University, Gangneung 25457, Korea.
authors.forename: Sung Hee
authors.initials: SH
authors.lastname: Park
authors.affiliation: Department of Bioindustrial Technologies, Konkuk University, Seoul 05029, Korea.
authors.forename: Sang-Gi
authors.initials: SG
authors.lastname: Min
authors.affiliation: Department of Bioindustrial Technologies, Konkuk University, Seoul 05029, Korea.
authors.forename: Yeon-Ji
authors.initials: YJ
authors.lastname: Jo
authors.affiliation: Department of Food Bioengineering, Jeju National University, Jeju 63243, Korea.
authors.forename: Ji-Yeon
authors.initials: JY
authors.lastname: Chun
keywords: dairy products; emulsion; high pressure homogenization; natural plant powder; particle size