Viability of Microencapsulated Probiotics in Cross-Linked Alginate Matrices and Chia Seed or Flaxseed Mucilage During...

Interest in probiotics has not diminished, and techniques to protect them from the environment in which they are found are constantly being innovated. Spray-drying is the most studied and industrially used technique to encapsulate probiotics. Recently, a new process has been developed in which particle formation, alginate cross-linking, and drying are carried out in a single step. In this study, Bifidobacterium infantis, Bifidobacterium longum, Lactobacillus plantarum, and Lactobacillus rhamnosus were microencapsulated by spray-drying using a cross-linked alginate matrix supplemented with chia seed mucilage (CM) or flaxseed mucilage (FM) as the coating material. All formulations evaluated, supplemented with 0.4% (w/v) of CM or FM, including the control formulation showed high survival rates, varying between 87% and 97%. The viability of microencapsulated probiotics was affected by storage temperature. At 4 °C, viability decreased slightly, and after 90 days, the viable probiotic count ranged from 7 to 11 Log CFU/g of dry powder. Meanwhile, viability did not exceed 4 Log CFU/g of dry powder at 37 °C. Probiotic microencapsulation in cross-linked alginate matrices and chia or flaxseed mucilage by spray-drying is presented as a promising alternative for their protection, potentially improving the long-term stability and efficacy of the probiotic product.