Lipid Composition Purification via Solvent-Parameter Extraction
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Solution Overview
Problem
Lipid nanoparticles encapsulating siRNAs contain impurities that adversely affect their in vivo kinetics and reduce the knockdown efficiency of target genes, as identified in existing drug delivery systems.
Innovation Solution
A method involving liquid-liquid extraction using specific solvents with a solubility parameter of 14.8 to 20.5 (MPa1/2) is employed to purify a composition, resulting in a lipid nanoparticle formulation with a high content of compounds (2-1), (2-2), and (2-3) exceeding 90% by mass, thereby reducing impurities and enhancing in vivo kinetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lipid nanoparticles are used without purification, then the formulation process is simple, but impurities adversely affect in vivo kinetics and reduce knockdown efficiency
Solution Approach 1:
The patent applies liquid-liquid extraction to separate and remove impurities from the lipid nanoparticle composition. By extracting the composition into a specific organic solvent system and back into aqueous phase, impurities are taken out of the final formulation, thereby improving in vivo kinetics without requiring complex multi-step purification procedures
Solution Approach 2:
The patent utilizes changes in solubility parameters to achieve purification. By selecting an organic solvent with specific solubility characteristics (SP value between 14.8-20.5 MPa^1/2), the method exploits differences in solubility between the lipid nanoparticle components and impurities to achieve selective separation and purification
2Reliability
If impurities are present in the lipid composition, then the manufacturing process is simpler, but the knockdown efficiency of target genes is reduced
Solution Approach 1:
The patent introduces an organic solvent as an intermediary medium to facilitate purification. This solvent acts as a mediator that selectively interacts with impurities, allowing them to be separated from the desired lipid nanoparticle components through controlled extraction and phase separation, thereby improving knockdown efficiency while maintaining manufacturing simplicity
3Manufacturing precision
If a broad range of solvents is used for extraction, then the purification is more thorough, but the process complexity and solvent selection difficulty increase
Solution Approach 1:
The patent establishes specific parameter ranges for solvent selection (SP value of 14.8-20.5 MPa^1/2) to optimize purification. By defining this precise parameter range, the method achieves thorough purification while simplifying solvent selection, as only solvents within this range are suitable for the extraction process
Solution Approach 2:
The patent identifies specific local characteristics of the organic solvent system (SP value range, specific solvent types like ethyl acetate, butyl acetate, diethyl ether) that are essential for effective purification. This localized quality requirement ensures high purification quality while limiting the search space for suitable solvents, thereby reducing selection complexity
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 purification method improves the in vivo kinetics of lipid nanoparticles to target sites and maintains high knockdown efficiency of target genes by minimizing impurity effects.
Implementation Method 1
a step of dissolving a composition including a compound represented by the following Formula (1) in an aqueous layer to perform liquid-liquid extraction and refining the compound represented by the following Formula (1)
Data Source
AI summary
A method for purifying a composition, the method including a step of dissolving a composition including a compound represented by Formula (1) [in Formula (1), R1 represents —N(R2)—R2 (R2 represents a C1 to C4 alkyl group), each R3 and R4 represents a C3 to C8 alkanediyl group, R5 represents a hydroxyl group, R6 represents —R7—OH (R7 represents a C4 to C12 alkanediyl group) or a hydrogen atom, and n represents an integer of 0 or 1] in an aqueous layer to perform liquid-liquid extraction, in which an oil layer used for the liquid-liquid extraction includes one or more kinds of liquids selected from the group consisting of a ketone-based liquid, an ester-based liquid, and an ether-based liquid, all of which have a solubility parameter (SP value) of 14.8 to 20.5 (MPa1/2).