pH-Responsive Mucoadhesive Microbial Encapsulation
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Solution Overview
Problem
Current technologies lack effective methods for controlled and direct modulation of the gastrointestinal microbiome, particularly in delivering microbes to specific sites within the GI tract due to challenges such as low pH and high bile salt concentrations, leading to poor survival and targeting of microorganisms.
Innovation Solution
Development of compositions involving encapsulated single-cell microorganisms coated with mucoadhesive polymers and a pH-responsive outer layer, specifically using EUDRAGIT® E PO and EUDRAGIT® L100, to enhance survival, retention, and targeted release at specific pH sites within the GI tract.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microorganisms are delivered through the stomach to target areas in the GI tract, then site-specific delivery is achieved, but survival is reduced due to low pH and high bile salt concentration
Solution Approach 1:
The patent uses pH-responsive polymers as intermediary protective layers that dissolve at specific pH thresholds to release microorganisms. Eudragit L100 dissolves at pH≥6.0 (intestinal conditions) while Eudragit E PO dissolves at pH≤3.0 (gastric conditions), acting as pH-dependent mediators that protect microbes in the stomach and enable targeted release in the intestines or colon
Solution Approach 2:
The patent exploits pH parameter changes along the GI tract to control polymer dissolution and microorganism release. By selecting polymers with specific dissolution pH thresholds (Eudragit L100 at pH≥6.0, Eudragit E PO at pH≤3.0), the system responds to physiological pH variations to achieve site-specific delivery while protecting microbes from harmful gastric conditions
2Reliability
If microorganisms are encapsulated with mucoadhesive polymers, then retention and adherence to target tissue is improved, but device complexity increases
Solution Approach 1:
The patent employs composite polymer coatings combining mucoadhesive polymers (chitosan, alginate, carbomer) with pH-responsive polymers (Eudragit L100, E PO). This composite structure integrates multiple functions: chitosan and alginate provide mucoadhesion and protection, while Eudragit polymers provide pH-responsive dissolution for targeted release, achieving enhanced retention without excessive complexity through synergistic material combination
Solution Approach 2:
The patent designs polymer coatings that perform multiple functions simultaneously: mucoadhesion to GI tract tissues, protection from gastric insults, and pH-responsive dissolution for targeted release. Materials like chitosan and Eudragit polymers exhibit multi-functionality, serving as both protective barriers and controlled-release mechanisms, thereby improving retention while managing system complexity
3Reliability
If encapsulated microorganisms are delivered to specific sites, then targeted treatment is achieved, but delivery control precision is reduced
Solution Approach 1:
The patent applies different polymer properties to different regions of the GI tract by selecting pH-responsive polymers with specific dissolution thresholds. Eudragit L100 targets the small intestine (pH≥6.0) while E PO targets the stomach (pH≤3.0), creating location-specific delivery through pH-dependent polymer dissolution characteristics that match physiological pH gradients in different GI segments
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures prolonged survival and targeted delivery of microorganisms to specific sites in the GI tract, improving their viability and adherence, thereby facilitating effective treatment or prevention of gastrointestinal-related diseases.
Implementation Method 1
The pH-responsive polymers dissolve at a specific pH or range of pHs. For example, the pH or range of pH can correspond with the local pH of a specific target site which allows the release of the encapsulated microorganism at the site.
Implementation Method 2
The layer-by-layer mucoadhesive polymeric coating prolongs viability and enhances the retention of the encapsulated microorganism so that it will not be eliminated before it has had a chance to exert an effect.
Data Source
AI summary
Methods of encapsulating microorganisms, or components thereof, for targeted enteric delivery to an animal host have been developed. In particular, the encapsulation provides a prolonged survival, extended retention and a pH-sensitive release of the encapsulated microorganisms or antigenic components thereof at targeted sites within the gastrointestinal tract. The formulations are useful for diagnostic, therapeutic and prophylactic purposes and can alter a host's microbial composition associated with a condition or a disease state.