Bifidobacterium animalis subsp. lactis was entrapped in alginate, alginate-chitosan, alginate-chitosan-Sureteric and alginate-chitosan-Acryl-Eze. Survival and in vitro release of bifidobacteria from the microparticles were investigated under conditions simulating gastrointestinal fluids covering the pH range from 1.5 to 7.5, with and without pepsin (3gL−1), pancreatin (1gL−1), and bile (10gL−1). All types of microcapsules protected B. animalis, but the use of chitosan and enteric polymers in the formulation of the beads, especially Acryl-Eze, enhanced the beneficial effects of the microencapsulation technique. Besides promoting the controlled release of bifidobacteria in simulated gastrointestinal juices, the microencapsulation with enteric polymers improved the survival rate of these microorganisms.
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Liserre et al. (2007) studied this question.
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