乳清蛋白气凝胶的改性及对其装载性能的影响

Objective] Whey protein aerogel prepared by freeze drying has low compressive strength and is easily broken. With the aim to improve the compressive properties of whey protein aerogel and to broaden its application as an active compounds carrier in the food industry.[Method] Whey protein aerogel was modified with microcrystalline cellulose and Glutamine transaminase. A comparative study of microstructural properties as well as moisture absorption of the resulting aerogels was carried out. The linoleic acid was loaded in three aerogels to evaluate their oil loading capacity, protective properties and release profile of linoleic acid in the simulation gastrointestinal tract.[Result] The modified whey protein aerogel exhibited better compressive strength and active compounds loading capacity. The voids at the microstructural images of two modified aerogels were more uniformly sized compared to the non-modified sample. MCC blending augmented the pores size of the aerogel, while the pores on the surface of the Glutamine transaminase-modified aerogel were smaller than the non-modified aerogel. The linoleic acid loaded in all three types of aerogels can be selectively released in the intestinal environment. The Glutamine transaminase-modified aerogel has the lowest moisture absorption under high humidity condition, and the stronger ability to decrease the loaded linoleic acid susceptibility to oxidation. [Conclusion] Glutamine transaminase-modified aerogel had a better loading performance.