In the food industry, cyclodextrins, as unique food additives, are playing a crucial role. They have a special cyclic three-dimensional structure, with a hydrophobic inner cavity capable of encapsulating specific molecules and a hydrophilic outer shell that allows them to blend well into aqueous systems.
Cyclodextrins demonstrate remarkable efficacy in food preservation. For instance, β-cyclodextrin can prevent the volatilization of volatile substances such as spices and oils, enabling foods to maintain their aroma over an extended period. It also stabilizes nutrients like pigments, amino acids, and vitamins that are prone to oxidation and sensitive to light and heat, protecting them from degradation. When added to pre-baked frozen bread, cyclodextrins slow down the staling process. By binding with small molecules in the bread, cyclodextrins reduce the water activity. Moreover, their antioxidant properties help reduce free radicals and improve the bread's microstructure, thereby enhancing its water-holding capacity and minimizing quality loss during freezing. Additionally, cyclodextrins can facilitate the slow release of food preservatives and freshness agents, enhancing the preservation effect and effectively extending the shelf life of food products.
Cyclodextrins also excel in flavor regulation. They can eliminate unpleasant odors in fish and meat, as well as those arising from added nutrients in foods, improving the palatability of the products. For example, adding a small amount of cyclodextrin to Kuding tea can significantly reduce its bitter taste. Furthermore, they can enhance the taste of sweeteners such as saccharin and cyclamate. In high-fat beverages like ice cream and coffee drinks, cyclodextrins help form long-term stable emulsions. Additionally, cyclodextrins can encapsulate substances like curcumin. When curcumin encapsulated by cyclodextrins is dissolved in beverages, not only does the original flavor of turmeric disappear, but its utilization rate also increases.
With the continuous advancement of research, the application of cyclodextrins in food preservation and flavor regulation is expected to have an even broader future, bringing more innovations and development opportunities to the food industry.
