Preparation of Decaglycerol Monooleate-sodium Caseinate Complex and Stabilization for Citral
Article
Figures
Metrics
Preview PDF
Reference
Related
Cited by
Materials
Abstract:
Decaglycerol monooleate (DGMO)-sodium caseinate (NaCas) complex was prepared by the self-assembly method. The particle size, polydispersity index (PDI), and zeta potential were used as indexes to investigate the effect of mass ratio of NaCas-to-DGMO on the complex. Furthermore, fluorescence spectroscopy, UV-Vis spectrophotometry, and Fourier transform infrared spectroscopy (FTIR) were used to characterize the NaCas-DGMO complex. The properties of the NaCas-DGMO complex, such as stability against pH and salts, and emulsifying property of soybean oil-in-water (O/W) emulsion, were also investigated. A stable complex with a particle size of 238.10 nm and a PDI of 0.27 was obtained with a NaCas-DGMO mass ratio of 1:2 and 80 ℃ for one hour. The fluorescence and FT-IR spectra showed that the NaCas-DGMO complex could exist stably, and hydrophobic interaction promoted the formation of the NaCas-DGMO complex, which enhanced the surface hydrophobicity of NaCas (319.46 to 596.45). The NaCas-DGMO complex had better stability against acid and salts, and showed the ability to improve the dispersity of NaCas. The NaCas-DGMO complex had excellent properties of stable O/W emulsions, which could form a stable interfacial layer on the surface of oil droplets to prevent them from coagulating. The constructed O/W emulsion had better stability after encapsulation of citral with a particle size of 208~225 nm and PDI of 0.18~0.27. The citral retention rate was 78.83% after storage for 28 days, which could effectively protect the citral. Therefore, the NaCas-DGMO complex could stabilize O/W emulsions and be used as a good delivery system for lipophilic bioactive compounds.
