In the first year of the project, we worked on the design of 3D printed food models for the elderly population, mostly the youngest-old (65 to 74 years) and middle-old (75-84 years). The target was to develop food formulations using 3D printing that was high in protein and contained key bioactive compounds to support healthy aging. The addition of bioactive substances to foods is often very challenging since they provide off-flavors, interact with other food components, or are chemically unstable in the food environment decreasing their bioactivity. Hence, we use electrospraying technology to develop an encapsulation system that allows the incorporation of the desired bioactive compounds into foods without affecting their quality properties.
Milk ingredients were selected to develop the food inks, which are not only rich in protein (>70% w/w) but also contain key amino acids and bioactive proteins that had been described to have a positive impact on muscle synthesis slowing down sarcopenia. DHA/EPA fatty acids are added at a recommended dose to support cardiovascular and brain health, and olive polyphenols (hydroxytyrosol and derivates) to support the protection of blood lipids from oxidative stress.
DHA/EPA was successfully encapsulated into a milk protein carrier. The oxidative stability of fatty acids during storage will be tested by the end of 2022.
About 12 different milk protein formulations have been tested for printability, in order to select the best candidates for the food prototypes that will include encapsulated bioactive compounds.