Cationic Hydroxyethyl Cellulose for Mucosal Drug Delivery
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Solution Overview
Problem
Existing cationic polysaccharide polymers for mucosal surface delivery have limitations in permeation and solubility, particularly chitosan, which is variable in quality and insoluble at certain pH values, necessitating a synthetic polymer with improved properties for effective drug delivery across mucosal surfaces.
Innovation Solution
A cationic polymer with a hydrophobic quaternary ammonium group covalently attached to a hydroxyethyl cellulose polymer backbone, providing enhanced solubility and permeation capabilities across a wide pH range, formulated as an aqueous solution for mucosal surface application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chitosan is used as an excipient, then it provides permeation capabilities, but it is insoluble at certain pH values and has variable quality
Solution Approach 1:
The patent modifies the chemical structure of the polymer by introducing quaternary ammonium groups with varying hydrophobicity (different alkyl chain lengths) to optimize both permeation capability and solubility across different pH ranges, resolving the contradiction between reliable permeation and broad pH adaptability
Solution Approach 2:
The invention creates a composite excipient by covalently attaching cationic quaternary ammonium groups to a hydroxyethyl cellulose polymer backbone, combining the permeation properties of cationic polymers with the solubility advantages of synthetic cellulose derivatives
2Adaptability or versatility
If a synthetic polymer is used instead of chitosan, then solubility is improved, but permeation capability must be maintained
Solution Approach 1:
The patent systematically varies parameters including the length of hydrophobic alkyl chains (1-6 carbons), degree of substitution (0.01-0.5), and molecular weight (50,000-1,000,000) to optimize the balance between solubility and permeation, ensuring reliable drug delivery while maintaining broad pH solubility
Solution Approach 2:
The invention introduces localized hydrophobic quaternary ammonium groups at specific positions along the hydroxyethyl cellulose backbone, creating regions of high cationic charge density that enhance permeation while the overall polymer structure maintains solubility
3Duration of action of moving object
If cationic polymer concentration is increased to improve residence time, then permeation is enhanced, but tissue viability may be compromised
Solution Approach 1:
The patent optimizes the concentration range (0.01-5%) and molecular weight (50,000-1,000,000) to achieve sufficient residence time and permeation enhancement while maintaining tissue compatibility and viability, resolving the contradiction between effective drug delivery and tissue safety
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 cationic polymer significantly improves the residence time and permeation of physiologically active agents through mucosal surfaces, outperforming existing polymers and chitosan, while maintaining tissue viability and membrane integrity.
Implementation Method 1
a cationic polymer with a hydrophobic quaternary ammonium group covalently attached to a hydroxyethyl cellulose polymer backbone, providing enhanced solubility and permeation capabilities
Implementation Method 2
the cationic polymer significantly improves the residence time and permeation of physiologically active agents through mucosal surfaces
Data Source
AI summary
An aqueous solution comprising a cationic polymer dissolved in water, wherein said cationic polymer comprises a hydrophobic quaternary ammonium group covalently attached to a hydroxyethyl cellulose polymer backbone. Also, a method of delivering a drug to a mucosal surface in a living body, said method comprising applying the aqueous solution to said mucosal surface.