HPBCD Isomer Purification for Selective Guest Molecule Delivery
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Solution Overview
Problem
Existing hydroxypropyl-beta-cyclodextrin (HPBCD) products are gross mixtures with uncontrolled alkylation, leading to a wide variety of isomeric configurations, making it difficult to achieve selective solubilization or delivery of guest molecules, as conventional chromatography methods fail to separate these isomers effectively.
Innovation Solution
A composition of HPBCD molecules with controlled substitution patterns, specifically less than 0.05% unsubstituted and DS-1, and an average degree of substitution between 6.02-7.98, suitable for intrathecal, intravenous, or intracerebroventricular administration, is developed through nanofiltration and pH adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional chromatography methods are used to separate HPBCD isomers, then the process is simple and equipment is available, but the separation effectiveness is insufficient and isomers cannot be effectively separated
Solution Approach 1:
The patent changes the separation mechanism from conventional chromatography to capillary electrophoresis, altering the physical parameter of separation from adsorption-based to electrophoresis-based. This enables effective separation of HPBCD isomers by exploiting their different electrophoretic mobilities in a capillary field, achieving resolution that conventional chromatography cannot provide
Solution Approach 2:
The patent replaces the mechanical chromatography system with an electrophoretic system using capillary electrophoresis. This substitution uses electrical fields rather than mechanical flow and adsorption mechanisms, enabling separation of isomers based on their charge and mobility differences in the capillary, thereby achieving effective separation where mechanical chromatography fails
2Ease of manufacture
If gross mixture of HPBCD is used, then manufacturing cost is low and production is simple, but selective solubilization and delivery of guest molecules cannot be achieved
Solution Approach 1:
The patent segments the gross HPBCD mixture into individual isomeric components through capillary electrophoresis separation. Each isomer (DS-2, DS-3, DS-4, etc.) is isolated as a distinct fraction, transforming the undifferentiated mixture into separated, identifiable components with specific substitution patterns, thereby enabling selective application based on desired guest molecule interactions
Solution Approach 2:
The patent assigns different functional properties to different HPBCD isomers based on their specific substitution patterns. Each isomer exhibits local quality differences in terms of solubilization affinity, chelation capability, and guest molecule delivery efficiency, allowing selection of specific isomers for specific applications rather than using the average properties of the gross mixture
3Productivity
If alkylation process is left uncontrolled, then production efficiency is high and manufacturing is straightforward, but the resulting product contains 117,655 possible isomeric configurations making purification difficult
Solution Approach 1:
The patent performs preliminary separation of HPBCD isomers using capillary electrophoresis immediately after synthesis. This preliminary action divides the complex mixture into manageable isomeric fractions before final application, preventing the need for extensive downstream purification and enabling selective use of specific isomers while maintaining high overall production efficiency
Solution Approach 2:
The patent introduces capillary electrophoresis as an intermediary separation technique between synthesis and application. This intermediary process handles the complexity of isomer separation, acting as a mediator that transforms the uncontrolled synthesis output into organized, separable isomeric components without requiring changes to the high-efficiency synthesis process itself
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 composition achieves selective solubilization and delivery of guest molecules, such as cholesterol, effectively treating conditions like Niemann-Pick disease Type C, liver disease, cardiovascular disease, and familial hypercholesterolemia, with improved affinity and reduced impurities.
Implementation Method 1
A composition of HPBCD molecules with controlled substitution patterns, specifically less than 0.05% unsubstituted and DS-1, and an average degree of substitution between 6.02-7.98, suitable for intrathecal, intravenous, or intracerebroventricular administration, is developed through nanofiltration and pH adjustment.
Implementation Method 2
HPBCD is a common organic molecule having various industrial applications. Such applications include pharmaceutical excipients, polymers, solubilizing agents, chelating agents, drug delivery vehicles
Data Source
AI summary
The present disclosure relates to compositions comprising mixtures of hydroxypropyl-β-cyclodextrin, wherein the compositions may be isomerically purified. The disclosure also relates to methods of isomerically purifying a mixture of hydroxypropyl-β-cyclodextrins.