Effect of homogenization process on the structure and physical and chemical properties of fish oil microcapsules

Abstract

Abstract: Fish oil nanoemulsions and microcapsules were stabilized by soy protein isolate and phosphatidylcholine were prepared by three types of homogenization methods including high-pressure homogenization, cavitation jet homogenization and ultrasonic treatment, respectively. The effects of homogeneous process on the physicochemical properties of fish oil nanoemulsion and microcapsule were studied by comparing and analyzing the particle size, ζ-potential, stability, viscosity and emulsification yield, microcapsule morphology, physicochemical properties and stability of nanoemulsion. The study found that the nanoemulsion prepared by the cavitation jet process had a small average particle size, high emulsion yield and high emulsion stability. The embedding rate of the microcapsule prepared by the cavitation jet wass 87.44%, and its solubility was high. The surface of this microcapsule particle was full, dense, free of cracks and voids. The microcapsule prepared by the cavitation jet homogenization had good oxidation and thermal stability. Nanoemulsion prepared by high-pressure homogenization and ultrasonic crushing had larger average particle size, lower emulsion yield and lower emulsion stability. The embedding rates of the microcapsules obtained by high-pressure homogenization and ultrasonic crushing were 80.55% and 78.64%, respectively. The solubility of these microcapsules were lower than cavitation jet. In addition, microcapsules and larger pores appeared on the surface of the microcapsule particles, respectively, which had poor oxidation stability and thermal stability. The results obtained by infrared spectroscopy showed that all three homogeneous processes had high embedding efficiency. It can be seen that the fish oil nanoemulsion and microcapsule prepared by the cavitation jet homogenization was superior to the other two methods in product performance. This study can provide a theoretical basis for the selection of homogeneous processes of fish oil nanoemulsion and microcapsule products and the construction of an application evaluation system.

Key words: fish oil, nanoemulsion, microcapsule, homogeneous process, structure, product characteristics

CLC Number:

TS214.9

References

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