Final answer:
Polysaccharides are the nanocomposite materials used to increase the freshness and shelf life of food and beverages.
Step-by-step explanation:
The nanocomposite material classification used in the niche application of increasing the freshness and shelf life of food and beverages is polysaccharides. Polysaccharides are widely studied nanomaterials that can be used as nanocarriers for preserving and enhancing the quality of food and beverages. Different techniques such as spray drying, emulsification/solvent evaporation, and coacervation can be employed to prepare polymeric nanoparticles with a large surface area, improving the interaction between immune cells and the immunostimulative payload.