Enhanced viability of probiotics in composite hydrogel beads

Abstract

Composite hydrogel is common way to protect probiotics from harsh environment. The study designed and optimized double-saccharide composite hydrogel beads for the encapsulation of Companilactobacillus crustorum MN047 (C. crustorum MN047) by adjusting the combination ratios of low methoxyl pectin (LMP) and sodium alginate (SAG) and the concentrations of calcium chloride (CaCl2). Encapsulation efficiency of hydrogel beads ranged from 87.69% to 99.98%. Hydrogel beads significantly increased the viability of C. crustorum MN047 in the simulated gastrointestinal (the number of viable probiotics was more than 7 log CFU/g at simulated SIF for 4 h) and storage environments (the number of viable probiotics was more than 7 log CFU/g at 25 °C at day30). Rheological tests proved pectin-based hydrogel possessed stronger crosslinking degree than alginate-based hydrogel. FT-IR and SEM indicated C. crustorum MN047 was encapsulated successfully, and polyelectrolyte polymers along with Ca-crosslinking play an important role in the formation mechanism. These results are attributed to the design of probiotic encapsulation systems and the promotion of the exploitation of probiotic functional products.