Polymer-Coated Virus Particles for Oral Vaccine Stability
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Solution Overview
Problem
Current oral virus vaccines are unstable in low pH environments of the gastrointestinal tract, leading to reduced effectiveness in delivering the vaccine to the intestines, where they are needed to prevent viral infections such as porcine epidemic diarrhea (PED) in pigs.
Innovation Solution
A polymer-coated virus particle formulation comprising a cationic polymer layer and a pH-sensitive polymer layer surrounding the virus particles, which can maintain stability and integrity at low pH conditions, allowing effective delivery to the intestines without destruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If oral virus vaccines are administered directly, then easy administration is achieved, but the vaccine becomes unstable in the low pH environment of the gastrointestinal tract
Solution Approach 1:
The vaccine is formulated as a composite material consisting of virus particles embedded in a polymer matrix. This composite structure provides both the biological activity of the virus and the protective properties of the polymer, resolving the contradiction between ease of administration and stability in low pH environment.
Solution Approach 2:
The polymer matrix changes its physical properties (such as swelling or degradation) in response to pH changes. At low pH in the stomach, the polymer remains intact to protect the virus, while at higher pH in the intestines, the polymer undergoes transformation to release the virus particles, thus adapting to different environmental conditions.
2Reliability
If the vaccine is protected from gastric acid, then delivery stability is improved, but the vaccine structure becomes more complex
Solution Approach 1:
A polymer matrix acts as a flexible protective shell surrounding the virus particles. This shell is simple in structure but effective in function, providing protection against gastric acid while allowing controlled release in the intestines, thus improving delivery stability without significantly increasing complexity.
Solution Approach 2:
The polymer matrix serves as an intermediary between the harsh gastric environment and the sensitive virus particles. It mediates the interaction by absorbing the shock of low pH and gradually releasing the virus in a controlled manner, simplifying the overall protection mechanism while maintaining high delivery stability.
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 polymer-coated virus particles remain stable and intact in the low pH environment of the gastrointestinal tract, enhancing the efficacy of vaccine delivery and prevention of viral infections by maintaining the integrity of the vaccine particles and facilitating their release at intestinal pH conditions.
Implementation Method 1
a cationic polymer layer; and a pH-sensitive polymer layer, wherein the cationic polymer layer and the pH-sensitive polymer layer are formed to surround one or more virus particles
Implementation Method 2
a pH-sensitive polymer layer, wherein the cationic polymer layer and the pH-sensitive polymer layer are formed to surround one or more virus particles
Data Source
AI summary
The present disclosure relates to a polymer-coated virus particle for an oral virus vaccine, a method of preparing the same, and a composition comprising the same. In accordance with the present disclosure, the oral virus vaccine can be effectively delivered to the intestines without being destroyed even in the low pH environment of the gastrointestinal tract, then the prevention efficacy against viral infections can be improved.