Soy protein isolate–guar gum–goose liver oil O/W Pickering emulsions that remain stable under accelerated oxidation at high temperatures

Abstract

BackgroundGoose liver oil (GLO) is a solid‐liquid mixture, rich in polyunsaturated fatty acids and high in nutritional value, but poor in fluidity and easily oxidized. Therefore, O/W Pickering emulsions of three polysaccharides and soy protein isolate (SPI) with GLO were prepared to improve the stability of it.ResultsSDS‐PAGE, Fourier transform infrared spectroscopy, and zeta potential revealed that the SPI and complexes with konjac glucomannan, pectin, and guar gum (GG) ranged from 17‐75 KDa, with the site of action being the ‐OH stretch and the amide group, and bound by hydrogen bonding. Adding konjac glucomannan and GG significantly increased the water contact angle of the SPI to 74.1° and 59.0°, respectively. Therefore, the polysaccharide‐protein complexes could enhance the emulsion stability. In addition, the oil‐in‐water (O/W) Pickering emulsions with GLO had near‐Newtonian fluid rheological properties with a significant increase in apparent viscosity and viscoelasticity, forming a dual network structure consisting of a ductile and flexible protein network and a rigid and brittle polysaccharide network. The microstructure observation indicated that the O/W emulsions were spherical and homogeneous. The highest emulsification activity was observed for the GG‐SPI‐GLO emulsions, without significant delamination or flocculation and high oxidative stability after 7 days in storage.ConclusionThese results demonstrate that the construction of SPI‐GG‐GLO O/W Pickering emulsions can stabilize GLO even at high temperatures that promote oxidation.This article is protected by copyright. All rights reserved.