The soy protein isolate-Octacosanol-polysaccharides nanocomplex for enhanced physical stability in neutral conditions: Fabrication, characterization, thermal stability

Abstract

This study investigated the effects of adding different polysaccharides (Arabic Gum (GA), Sodium Alginate (SA) and Soy-soluble polysaccharides (SSPS)) on the embedding properties and physical stability of soybean protein isolate (SPI). 1-Octacosanol (1-Octa) was encapsulated in SPI nanoparticles. The addition of GA, SA, SSPS not only increased the encapsulation efficiency of 1-Octa from 90.38% to 96.65%, 95.49%, 94.74%, respectively, but also increased the ζ-potential of nanoparticles from -29.05 mV to -38.77 mV, -41.50 mV, -38.00 mV, respectively. Through the changes of ζ-potential and the Fourier transform infrared spectroscopy (FT-IR), it can be known that anionic polysaccharides can also combine with positive charges of SPI by the electrostatic interaction under neutral conditions. The thermal stability of nanoparticles has been greatly improved, and SA has the best effect on denaturation temperature of nanoparticles in aqueous phase. Overall, The nanoparticles of SPI, 1-Octa and polysaccharides have the potential to be used in drinks.

Keywords: 1-Octacosanol; Nanoparticles; Polysaccharide; Soy protein isolate; Stability.