Multi-Coated Liposome Nanoparticles for Stable Sustained Release
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Solution Overview
Problem
Existing nanoparticle delivery systems face challenges in controlling initial drug release and maintaining physical stability, with low entrapment efficiency and stability, particularly in multi-layer liposomes.
Innovation Solution
A multi-coated nanoparticle system is developed, comprising a liposome core layer surrounded by a phospholipid bilayer, with alternating coatings of chitosan and polyglutamic acid, enhancing electrostatic bonding and stability, and incorporating a core hydrogel to achieve sustained release of bioactive substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If multi-layer liposomes are used to induce sustained release, then the release control is improved, but the entrapment efficiency decreases to 60-70% and stability is maintained for only one week
Solution Approach 1:
The patent uses composite materials by combining chitosan and polyglutamic acid to form alternating coating layers on the liposome surface. This composite structure creates strong electrostatic interactions between the cationic chitosan and anionic polyglutamic acid, significantly improving both entrapment efficiency (to over 90%) and stability (maintained for over one month), while preserving the sustained release function.
Solution Approach 2:
The patent implements a nested structure with multiple alternating coating layers of chitosan and polyglutamic acid surrounding the liposome core. This nested multi-layer coating system provides progressive stabilization and enhanced drug retention, achieving high entrapment efficiency and prolonged stability while maintaining controlled release characteristics.
2Duration of action of moving object
If chitosan is primary coated on liposomes to achieve sustained release, then the sustained release effect is improved, but the stability suitable for commercialization is not achieved
Solution Approach 1:
The patent segments the single chitosan coating into multiple alternating layers of chitosan and polyglutamic acid. This segmentation creates a more complex and stable structure where each layer reinforces the others through electrostatic interactions, achieving commercialization-level stability while preserving the sustained release effect.
Solution Approach 2:
The patent combines chitosan with polyglutamic acid to form a composite coating system. The alternating layers create strong electrostatic bonding that significantly enhances stability for commercialization, while the layered structure maintains the sustained release capability through controlled drug diffusion.
3Productivity
If nanoparticle delivery system is used to achieve high skin absorption rate, then the absorption efficiency is improved, but the physical stability decreases and initial drug release cannot be controlled
Solution Approach 1:
The patent uses composite coating materials (chitosan and polyglutamic acid) that provide both high skin absorption capability through the nanoparticle structure and improved physical stability through electrostatic interactions. The alternating layers create a stable barrier that controls initial drug release while maintaining the high absorption rate characteristic of nanoparticles.
Solution Approach 2:
The patent employs thin film coatings of chitosan and polyglutamic acid on the nanoparticle surface. These flexible thin films maintain the nanoparticle's ability to penetrate skin while providing a stable structure that controls drug release kinetics and prevents premature release.
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 multi-coated nanoparticles exhibit high entrapment efficiency and stability, with sustained release properties, maintaining bioactive substance concentration over an extended period, suitable for drug delivery systems.
Implementation Method 1
chitosan and polyglutamic acid are alternately coated on the surface of a nano-liposome to provide a multi-coated nanoparticle
Implementation Method 2
These nanoparticles have high entrapment efficiency and stability of bioactive substances, and effectively release drugs in a sustained-release manner
Data Source
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AI summary
Multi-coated nanoparticles including multiple coating layers of chitosan and polyglutamic acid, composition for skin care including the same, and method of manufacturing the same are provided. The nanoparticles have a liposome core layer and coating layers. The core layer includes a bioactive particle and a core hydrogel. Not only is it easy to mass-produce, but also has the effect of steadily releasing bioactive particles for a long period of time due to its high sealing rate and high stability.