Background
The growing consumer interest in personalized food and nutrition is fueling the expansion of food 3D-printing. Color, a key factor in personalized food design, remains a major challenge for 3D-printing in the food industry. Printed food color typically comes from natural pigments. Structural color also appears in printed products and shows great potential in food coloring.
Scope and approach
A timely summary of 3D-printed color quality derived from natural pigments and structural colors is systematically presented. 3D-printing materials and systems for encapsulating natural pigments, printing properties, printing methods, stimulus response characteristics and applications are discussed. In addition, the article summarizes the recent achievements in 3D-printing structural color from cellulose-based cholesteric liquid crystals, including cellulose nanocrystal and hydroxypropyl cellulose (HPC) photonic materials along with the faced challenges and trends.
Key findings and conclusions
Natural pigments need to be encapsulated within suitable carrier systems before or during the 3D-printing process to enhance their stability and bioaccessibility. Encapsulation systems for 3D-printing need exhibit shear-thinning properties and sufficient mechanical strength. HPC is an ideal candidate for introducing structural color into food 3D-printing, and the structural color can be adjusted by changing concentrations, processing conditions and additives. Stimulus response characteristics of natural pigments and cellulose-based liquid crystal after 3D-printing can be applied to intelligent food packaging. Key aspects for future food color 3D-printing technology include developing novel food-grade printing materials and encapsulation systems, enhancing cellulose-based liquid crystal structural color with natural pigments, advancing structural color and full-color food 3D-printing, and promoting composite color modes.
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