Fractionated Alkylated Cyclodextrin for Pharmaceutical Purity
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Solution Overview
Problem
Current cyclodextrin derivatives, such as alkylated cyclodextrins, often contain impurities that reduce the shelf-life and potency of active pharmaceutical agents, and existing methods struggle to produce compositions with a consistent single degree of substitution, affecting their solubility and stability.
Innovation Solution
A fractionated alkylated cyclodextrin composition with 60% or more of a single degree of substitution is developed, prepared through a process involving chromatographic separation, specifically high performance liquid chromatography, to enhance purity and solubility, and combined with excipients or active agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional alkylated cyclodextrin derivatives are used, then solubility improvement is achieved, but impurities reduce shelf-life and potency of active pharmaceutical agents
Solution Approach 1:
The invention segments the cyclodextrin derivative population by degree of substitution (DS), separating molecules with DS≤2 from those with DS>2. This segmentation allows the formulation to utilize only the low-DS fraction that provides solubility enhancement without the harmful impurity effects of high-DS molecules, thereby resolving the contradiction between solubility improvement and reliability.
Solution Approach 2:
The invention extracts and removes the harmful high-DS (>2) fraction from the cyclodextrin derivative composition through filtration or other separation techniques. By taking out the impurity-causing portion while retaining the beneficial low-DS (≤2) fraction, the composition maintains solubility enhancement properties while eliminating the shelf-life and potency reduction effects.
2Productivity
If cyclodextrin derivatization reactions proceed without fractionation, then production efficiency is maintained, but consistency of degree of substitution is poor
Solution Approach 1:
The invention performs fractionation as a preliminary action after the derivatization reaction but before final formulation. By introducing this intermediate separation step, the process achieves consistent DS≤2 product without requiring precise control of the derivatization reaction conditions, thus maintaining production efficiency while improving manufacturing precision.
Solution Approach 2:
The invention changes the physical state or properties of the cyclodextrin derivatives during fractionation, utilizing differences in solubility, molecular size, or other parameters to separate low-DS from high-DS molecules. This parameter-based separation achieves consistent DS≤2 product while maintaining overall process efficiency.
3Quantity of substance
If high degree of substitution is achieved in cyclodextrin derivatives, then solubility enhancement is improved, but stability of active pharmaceutical agents deteriorates
Solution Approach 1:
The invention dynamically controls the degree of substitution distribution in the cyclodextrin derivative composition by implementing fractionation. Rather than attempting to achieve uniform high-DS modification, the process dynamically maintains DS≤2 through separation, achieving optimal solubility enhancement while preserving agent stability through controlled compositional dynamics.
Solution Approach 2:
The invention changes the critical parameter of degree of substitution from a high value (which would enhance solubility but reduce stability) to a controlled low value (DS≤2). This parameter change achieves the optimal balance where solubility enhancement is sufficient while stability is maintained, resolving the contradiction between these two properties.
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 fractionated alkylated cyclodextrin composition achieves enhanced purity, reduced impurities, improved solubility, and stability, leading to better safety and efficacy in pharmaceutical formulations.
Implementation Method 1
passing the solution through a chromatographic separation system having a stationary phase and a mobile phase
Data Source
AI summary
The present invention relates to compositions comprising fractionated alkylated cyclodextrin compositions having a single degree of substitution, and processes for preparing and using the same.