Effects of nano starch-lutein on 3D printing properties of functional surimi: Enhancement mechanism of printing effects and anti-oxidation

To improve the formability and function of 3D printed surimi, the printing effects and anti-oxidation of surimi with nano starch-lutein (NS-L) were determined. Results shown NS-L with ratio of 25:1 had stable particle size of 280 nm. The filling of NS-L and increased hydrophobic force, disulfide bond with short length of NS-L-surimi (0.5% lutein) promoted intramolecular polymerization to form denser structure, conducing to high hardness, elasticity, viscosity, which strengthened self-supporting ability and bonding ability. Decreased yield stress (τy) of NS-L-surimi reduced extrusion force to strengthen extrudability and flexibility, avoiding material breakage to promote printing ability. Moreover, NS-L also softened printed surimi texture after ripening to adapt patients with mastication difficulties. The electrostatic interaction changes and aggregation of NS-L-surimi affected charged groups to enhance electronic offering, significantly increasing anti-oxidation. Prolonged lutein release exhibited NS-L-surimi could exert function for longer-lasting. Thus, NS-L could promote the application of functional surimi in 3D printing. [Display omitted] •Shapes of printed NS-L-surimi before and after ripening were compared.•Texture, gel strength, structure, rheology, chemical bond were determined.•Material properties of NS-L-surimi were contrasted before and after printing.•Mechanism of NS-L on printing effects of surimi were analyzed.•Lutein release and anti-oxidation of NS-L-surimi were measured.