Thesis - Open Access
Master of Science (MS)
Department / School
Emulsions, Rheology, Soy lecithin, Stabilizer, Storage, Ultrasound
The ability of high intensity ultrasound to produce stable emulsions without the addition of surfactant was evaluated in a dairy-based formulation. The formulation consisted of protein (4.33 ± 0.05%, whey protein concentrates (WPC80), carbohydrates (21.52 ± 0.75%, sucrose and maltodextrin), oil (2.90 ± 0.05%, soybean oil), and surfactant (0-.05%). Pre-emulsions formulated with either 0, 0.025, and 0.05% of soy lecithin were treated for 5 min at an acoustic intensity of either 42.58 ± 2.98, 56.83 ± 3.01, or 70.48 ± 2.97 W cm-2. The stability of the emulsions was evaluated through particle size, dynamic rheology, gel electrophoresis, and microstructure. In general, the particle size decreased with the acoustic intensity (397 to 230 nm), regardless of the concentration of soy lecithin. Dynamic rheology (strain and frequency sweeps) showed an improved stability of the emulsions treated at 56.83 ± 3.01 and 70.48 ± 2.97 W cm-2 without the addition of soy lecithin, displaying a distinctive viscoelastic region and a behavior of weak gel. During 21 days of storage at 4°C, the particle size slightly increased (470-500 nm), while the mechanical spectra remained essentially unchanged. High intensity ultrasound offers opportunities for reducing surfactants in dairy-based formulations.
Library of Congress Subject Headings
Dairy products industry.
Number of Pages
South Dakota State University
Nyuydze, Collette Kernyuy, "Effect of Soy Lecithin Concentration on Formulating Dairy Emulsions Through Ultrasound Treatment" (2020). Electronic Theses and Dissertations. 4111.