Liposome Inner Water Phase Sulfobutyl Ether Cyclodextrin Salt
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Solution Overview
Problem
Current methods for loading anti-tumor drugs like vinorelbine and topotecan into liposomes face challenges such as toxicity from ionophores and physiologically active excipients, leading to inefficient encapsulation and rapid drug release, which reduces therapeutic efficacy and increases toxicity.
Innovation Solution
The use of sulfobutyl ether cyclodextrin salt as the inner water phase in liposomes, forming an anion gradient and a pH gradient with metal cation ionophores for active drug loading, which enhances encapsulation efficiency and extends drug retention time without the need for high ionophore amounts or additional dialysis steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional active drug loading methods (pH gradient, ammonium sulfate gradient, complexation gradient) are used to load water-soluble anti-tumor drugs into liposomes, then drug encapsulation is achieved, but toxicity from ionophores and physiologically active excipients increases and encapsulation efficiency is insufficient
Solution Approach 1:
The invention extracts and removes the toxic components (ionophores and physiologically active excipients) from the drug loading system while retaining the essential gradient mechanism. By using sulfobutyl ether cyclodextrin salt as the inner water phase, the system eliminates the need for toxic ionophores and dialysis steps, achieving both high encapsulation efficiency and reduced toxicity.
Solution Approach 2:
The invention changes the chemical parameter of the inner water phase from conventional buffers or salts to sulfobutyl ether cyclodextrin salt. This parameter change enables the formation of stable anion gradients without requiring toxic ionophores, thereby improving encapsulation efficiency while reducing harmful effects.
2Reliability
If high amounts of ionophores are used to form pH gradients for active drug loading, then drug encapsulation into liposomes is improved, but ionophore toxicity increases
Solution Approach 1:
The invention completely removes ionophores from the system by using sulfobutyl ether cyclodextrin salt as the inner water phase. The cyclodextrin salt itself forms the gradient without requiring additional ionophore agents, thereby eliminating ionophore toxicity while maintaining effective drug encapsulation.
Solution Approach 2:
The sulfobutyl ether cyclodextrin salt acts as an intermediary substance that replaces the function of ionophores. It forms stable anion gradients through its unique molecular structure and solubility properties, achieving drug encapsulation without the toxic side effects of conventional ionophores.
3Productivity
If conventional inner water phases are used for drug loading, then drug loading is achieved, but drug release is too rapid which reduces therapeutic efficacy
Solution Approach 1:
The invention uses sulfobutyl ether cyclodextrin salt as a composite inner water phase that combines the properties of a buffer system with cyclodextrin inclusion capabilities. This composite material provides both effective drug loading and controlled drug release by forming stable complexes with the drugs, thereby extending drug retention time in the liposomes.
4Manufacturing precision
If additional dialysis steps are used to remove excess excipients after drug loading, then purity of the liposomal preparation is improved, but process complexity and time increase
Solution Approach 1:
The invention extracts and eliminates the need for additional dialysis steps by using sulfobutyl ether cyclodextrin salt as the inner water phase. The cyclodextrin salt is incorporated into the liposome structure itself, so no separate removal step is needed, thereby simplifying the process while maintaining high purity.
Solution Approach 2:
The sulfobutyl ether cyclodextrin salt performs multiple functions simultaneously: it forms the gradient for active loading, stabilizes the liposome structure, and eliminates the need for separate dialysis steps. This self-service approach reduces process complexity while achieving the desired purity.
Data Source
AI summary
A liposome comprising bilayer and inner water phase is disclosed. Said inner water phase may contain sulfobutyl ether cyclodextrin and an active compound.