Physicochemical properties and rheological behavior of chrysanthemum powder made by superfine grinding and high pressure homogenization

Abstract

AbstractThe effects of superfine grinding on the properties of chrysanthemum powder (CP) and high pressure homogenization (HPH) on the rheological properties of CP suspensions were investigated. Superfine grinding reduced particle size to a D50 of 28.45 μm. Instantaneous flow function and wall friction tests demonstrated that superfine ground CP had poor flowability and was more cohesive than more coarsely ground samples. Superfine grinding increased thermal stability and reduced the crystallinity of CP. After HPH treatment, the apparent viscosity and consistency coefficient (k, from 0.027 ± 0.005 to 1.847 ± 0.472) of CP suspension was significantly improved (p <.05), indicating that HPH treatment increased the consistency and reduced the fluidity of CP suspensions. As the HPH pressure increased from 40 to 120 MPa, the storage modulus (G') and loss modulus (G") of the CP suspensions increased, which fitted well with the Power Law model (R2 >.961). The CP suspension is a non‐Newtonian fluid with shear thinning behavior. Flow and rheological characteristics are measured under different consolidation pressures and HPH pressures, respectively. These findings reveal the potential application of superfine grinding and high pressure homogenization in the development of CP.Practical applicationThe use of superfine grinding and high pressure homogenization to process CP has broad application prospects, such as the preparation of micronized Chinese medicinal powders in the pharmaceutical industry and functional foods and beverages in the food industry.