Abstract:In order to improve the stability and efficacy of shrimp bioactive peptides，microencapsulation was carried out with Arabic gum and β-cyclodextrin as wall materials through a spray-drying method，generating shrimp bioactive peptide microcapsules （SBPM）. The preparation process was optimized，and the physicochemical properties of SBPM were studied. The results showed that the prepared SBPM was a faint yellow powder with a spherical-like structure，no holes，cracks，or undesirable odors，a characteristic particle size of D90＜10 μm，and good flowability at the following conditions：wall material ratio （Arabic gum to β-cyclodextrin mass ratio） of 3∶1，the core-to-wall ratio of 1∶4 （mass ratio），the solid content of 15%，and the monoglyceride content of 0.4%. The encapsulation efficiency of shrimp bioactive peptides reached （90.11±0.23）%. The intermolecular interactions between the shrimp bioactive peptides and the wall materials facilitated the formation of microcapsules. Microencapsulation significantly reduced the hygroscopicity of the shrimp bioactive peptides. After 12 hours of digestion in simulated gastrointestinal fluid，the cumulative release of peptides from SBPM reached 89.82%，indicating good sustained-release performance.