Cyclodextrin Squalene Inclusion Complex Vaccine Adjuvant
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Solution Overview
Problem
Existing adjuvant compositions, such as squalene-containing oil-in-water emulsions, face challenges with storage stability due to oxidation and hydrolysis of components, requiring refrigerated storage and limiting their application in diverse vaccine formulations.
Innovation Solution
The development of an adjuvant composition that incorporates adjuvants into microparticles of biodegradable polymers or encapsulates them in cyclodextrin, allowing for improved stability, ease of dispersion in aqueous solutions, and enhanced adjuvant activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If squalene-containing oil-in-water emulsion is used as adjuvant, then adjuvant efficacy is enhanced, but storage stability deteriorates due to oxidation and hydrolysis
Solution Approach 1:
The patent introduces cyclodextrin as an intermediary substance that forms an inclusion complex with squalene. The cyclodextrin cavity encapsulates the squalene molecule, protecting it from oxidation and hydrolysis while maintaining its adjuvant properties. This mediator approach resolves the contradiction by shielding the reactive adjuvant component without eliminating its functionality.
Solution Approach 2:
The patent creates a composite adjuvant system consisting of cyclodextrin-squalene inclusion complexes. This composite structure combines the protective characteristics of cyclodextrin with the immunostimulating properties of squalene, achieving both stability and efficacy simultaneously through material composition rather than relying on refrigeration alone.
2Stability of the object's composition
If refrigerated storage is required for adjuvant stability, then storage stability is maintained, but device complexity and logistics increase
Solution Approach 1:
The patent fundamentally changes the stability parameter of the adjuvant system by forming cyclodextrin inclusion complexes. This chemical parameter change enables the adjuvant to maintain stability at higher temperatures without refrigeration, thereby simplifying logistics and eliminating the need for complex cold chain infrastructure while preserving composition stability.
3Ease of operation
If surfactants are used for emulsion formation, then adjuvant component disperses in aqueous solution, but hydrolysis susceptibility increases
Solution Approach 1:
The patent replaces conventional surfactants with cyclodextrin as the dispersing agent. Cyclodextrin forms inclusion complexes with the adjuvant component, providing steric stabilization and preventing aggregation without the hydrolytic instability of traditional surfactants. This intermediary approach achieves dispersion while eliminating hydrolysis susceptibility.
4Reliability
If water-insoluble adjuvant components are used, then adjuvant activity is enhanced, but solubility in aqueous vaccine solutions deteriorates
Solution Approach 1:
The patent creates a composite system where cyclodextrin serves as a solubilizing carrier for water-insoluble adjuvant components. The inclusion complex acts as an amphiphilic structure with the hydrophobic adjuvant inside the cyclodextrin cavity and the hydrophilic cyclodextrin exterior interacting with aqueous vaccine solutions, thereby achieving both high adjuvant activity and complete solubility.
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
This approach enhances the stability and adjuvant efficacy of vaccine compositions, enabling storage at various temperatures, improved formulation flexibility, and increased immune response, particularly in vulnerable populations like newborns and the elderly.
Implementation Method 1
encapsulated in cyclodextrin
Implementation Method 2
incorporated into the microparticles of the biodegradable polymer
Implementation Method 3
emulsifying a terpenoid, oil-based squalene or the like with a surfactant such as Tween 80 or Span 85
Implementation Method 4
squalene, which has many unsaturated bonds, is susceptible to degradation by oxidation
Implementation Method 5
the surfactants such as Tween 80 and Span 85 used for emulsion formation are susceptible to hydrolysis
Data Source
AI summary
An adjuvant composition, comprising a complex comprising an adjuvant and microparticles of a biodegradable polymer and/or cyclodextrin, wherein the adjuvant is incorporated into the microparticles of the biodegradable polymer and/or encapsulated in the cyclodextrin.