sPLA2 Hydrolysable Liposomes Osmotic Gradient Storage Stability
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Solution Overview
Problem
sPLA2 hydrolysable liposomes face challenges with storage stability, particularly at 2-8 degrees Celsius, leading to leakage issues that affect the delivery of encapsulated drugs like cisplatin, requiring improved formulations to maintain stability and reduce leakage during storage and transport.
Innovation Solution
A composition comprising sPLA2 hydrolysable liposomes with an interior solution having a higher osmolyte concentration than the exterior solution, creating an osmotic gradient that reduces leakage, specifically by using a higher concentration of osmolytes such as NaCl and sucrose in the interior solution and a lower concentration in the exterior solution, along with optimized lipid composition and preparation methods to enhance storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sPLA2 hydrolysable liposomes are prepared with specific lipid composition for effective hydrolysis, then drug delivery efficacy to cancerous tissue is improved, but storage stability deteriorates leading to leakage
Solution Approach 1:
The patent applies parameter changes by modifying the osmotic gradient parameter between interior and exterior solutions. Specifically, it creates a higher osmotic pressure in the interior solution compared to the exterior solution, which compensates for the membrane destabilizing effect of the sPLA2-hydrolysable lipid composition during storage, thereby reducing leakage while maintaining drug delivery efficacy
Solution Approach 2:
The patent implements beforehand cushioning by pre-establishing an osmotic gradient in favor of the interior solution before storage. This osmotic cushioning effect counteracts the potential membrane instability and leakage that would otherwise occur during storage at 2-8°C, allowing the liposomes to maintain their integrity until administration
2Reliability
If liposomes are stored at 2-8 degrees Celsius to maintain drug stability, then drug degradation is reduced, but leakage from sPLA2 hydrolysable liposomes increases
Solution Approach 1:
The patent changes the osmotic parameter by creating a higher osmotic pressure in the interior solution relative to the exterior solution. This osmotic gradient compensates for the increased leakage tendency of sPLA2 hydrolysable liposomes at refrigeration temperatures (2-8°C), allowing storage at these temperatures to maintain drug stability without excessive leakage
Solution Approach 2:
The patent introduces an intermediary mechanism - the osmotic gradient - that mediates between the conflicting requirements of drug stability (requiring cold storage) and leakage reduction (worsened by cold storage in sPLA2 liposomes). The osmotic pressure difference acts as a compensating force that allows cold storage to proceed without excessive drug loss
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 proposed composition significantly reduces leakage of cisplatin during storage at 2-8 degrees Celsius, maintaining therapeutic agent concentration and stability, allowing for effective drug delivery by minimizing osmotic stress and enhancing the shelf life of sPLA2 hydrolysable liposomes.
Implementation Method 1
the concentration of osmolytes is higher in the interior solution than in the exterior solution
Data Source
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AI summary
The present invention provides a composition comprising a sPLA2 hydrolysable lipo- some, an exterior solution, and an interior solution within the liposome, -wherein the concentration of osmolytes is higher in the interior solution than in the exterior solution. The composition improves storage stability of sPLA2 hydrolysable liposomes, in particular at when stored at 2-8 degrees Celsius. The liposome preferably encapsulates cisplatin. The invention also provides methods of preparing the composition of the invention.