Extremely oxygen-sensitive next-generation probiotics: can current microcomposite formulations ensure effective...

Area of Science:

• Microbiology
• Biomaterials Science
• Pharmaceutical Sciences

Background:

• Next-generation probiotics (NGPs) offer therapeutic potential but often exhibit extreme oxygen sensitivity (EOS).
• Conventional microencapsulation techniques, developed for less sensitive probiotics, may not adequately protect EOS NGPs.
• A critical need exists to evaluate and adapt formulation strategies for these highly oxygen-sensitive bioactives.

Purpose of the Study:

• To review and assess the suitability of conventional biopolymer-based microencapsulation for protecting and delivering EOS NGPs.
• To identify microencapsulation materials and techniques that offer optimal oxygen protection for EOS bacterial viability.
• To highlight gaps in current formulation science for EOS NGPs and propose future directions.

Main Methods:

• Narrative review of existing literature on biopolymer-based microencapsulation for probiotics.
• Assessment of various microencapsulation materials (pectin, gellan gum, alginate, chitosan, xanthan gum) and techniques.
• Evaluation of hydrated versus dehydrated systems for preserving EOS bacterial viability.

Main Results:

• Hydrated pectin- and gellan-based microcomposite systems, especially with xanthan gum, showed superior oxygen protection.
• Alginate alone had inconsistent barrier properties, improved by chitosan blending or coating.
• Dehydrated systems offered no additional viability benefits over hydrated ones.
• No studies quantified oxygen exposure parameters or established protective thresholds for EOS strains.

Conclusions:

• Current microencapsulation approaches are insufficient for reliably protecting and delivering EOS NGPs.
• Tailored, bespoke delivery systems are essential, moving beyond conventional methods.
• Further research is needed to quantify oxygen sensitivity and develop advanced formulations for effective microbiome-based interventions.