Optimizing oral delivery of next generation probiotics

Background: Probiotic microbes may confer a variety of positive health effects on the host. Until now, development of probiotic products has mainly focused on Lactobacillus and Bifidobacterium species, which generally tolerate the stresses encountered during processing, storage and delivery well. In recent years, newly-discovered gut microbes have gained attention due to their association with healthy host conditions. However, these microbes, designated next generation probiotics, are often oxygen-sensitive, do not tolerate the established product processing techniques, and need protection during delivery and gastric transit.Scope and approach: Here, we review the challenges related to development of next generation probiotic products. The applications of current microbial processing and delivery techniques for the oxygen-sensitive next generation probiotics are assessed, and putative process optimizations are discussed.Key findings and conclusions: Current microbial product processing techniques are not suited for next generation probiotics, thus optimizations or entirely novel processing approaches are needed. Freeze-drying is currently the only method that keeps cells viable during processing and storage, but optimization of the process for individual strains is required, e.g. by adding antioxidants to the drying solution.Oral delivery of live next generation probiotics is poorly investigated. The strains in question are often known to colonize primarily in the colon, and carriers, such as microparticles and microdevices, which have been verified for colon-targeted delivery of drugs, may represent a novel choice as delivery vehicle for next generation probiotics.

Automated summary

This article reviews the challenges in developing next generation probiotic products, evaluates the current microbial processing and delivery techniques for oxygen-sensitive probiotics, and discusses possible process optimizations. The current microbial processing techniques are not suitable for next generation probiotics, necessitating the need for optimization or entirely novel approaches. Oral delivery of live next generation probiotics is poorly studied, suggesting the potential for novel delivery vehicles such as microparticles and microdevices.