Quinoa protein/polysaccharide electrostatic complex stabilized vegan high internal phase emulsions for 3D printing: Role of complex state and gelling-type polysaccharides

Rational selection of the complex state and polysaccharide type may enhance the performance of electrostatic complex stabilized high internal phase emulsions (HIPEs). Herein, quinoa proteins were extracted to form electrostatic complexes separately with three gelling-type polysaccharides to fabricate HIPEs. Results showed that the complexes in soluble state (pH 8.4-5.6) exhibited moderate size, high negative potential and enhanced protein hydrophobicity, and could achieve HIPEs with 84% oil phase upon acidification to pH 6 at low concentrations. Its excellent interfacial structure enhanced stability during heating, freeze-thawing and long-term storage, and exhibited promising 3D printing potential. Furthermore, the complexes formed by sulfated polysaccharide carrageenan had higher amphiphilicity than those formed by carboxylated polysaccharide pectin or sodium alginate, and their stabilized HIPE had preferable droplet size, stability and 3D printing resolution than its counterparts. This study may provide new insights into the performance enhancement of protein/polysaccharide electrostatic complex stabilized HIPEs.