Monolithic Polysaccharide Tablet for High API Loading
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Solution Overview
Problem
Existing polysaccharide excipients, such as starch, face issues with cohesion when compressed into tablets, leading to breakage and inability to achieve high active pharmaceutical ingredient (API) loading for dual-rate release (DRR) due to fine powder granules and lack of cohesion.
Innovation Solution
A process involving the swelling of polysaccharide granules in boiling water or water/polyol mixtures, followed by partial gelatinization in an alkaline solvent mixture, and low functionalization with a functionalizing agent under alkaline conditions to produce a functionalized polysaccharide with a degree of substitution of 0.1 to 0.3, which is then complexed with a divalent cation and formulated into a monolithic tablet dosage form for controlled release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polysaccharide granules are functionalized in aqueous medium by etherification with sodium monochloroacetate under alkaline conditions, then the degree of substitution increases, but the powder granules become fine and lack cohesion, causing tablet breakage
Solution Approach 1:
The patent changes the solvent system from pure aqueous medium to a binary or ternary mixture containing water, alcohol, and optionally polyol. This parameter change in the reaction medium prevents excessive granule disintegration while maintaining functionalization efficiency, producing granules with DS 0.5-1.5 that retain cohesion and can be compressed into stable tablets without breakage.
2Duration of action of moving object
If polysaccharide excipients are used with high degree of substitution, then the release control improves, but the API loading capacity decreases due to fine powder granules
Solution Approach 1:
By modifying the solvent composition to include alcohol and polyol components, the patent achieves optimal granule morphology that balances release control properties with mechanical integrity. This allows the excipient to maintain sufficient porosity and surface area for controlled drug release while preventing excessive fineness, thereby enabling high API loading capacities in the final tablet formulation.
3Ease of manufacture
If polysaccharide granules are compressed into tablets, then the dosage form is achieved, but the tablets break due to lack of cohesion in fine powder granules
Solution Approach 1:
The patent creates a composite granule structure by functionalizing polysaccharides in a modified solvent system that preserves the granular morphology. The resulting material combines the functional properties of highly substituted polysaccharides with the mechanical integrity of cohesive granules, enabling successful tablet compression without breakage while maintaining dual-rate release capabilities.
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 process enhances the cohesion of polysaccharide powder granules, enabling stable tablet formation and achieving dual-rate release of APIs, with the ability to load up to 1000 mg of active pharmaceutical ingredients effectively.
Implementation Method 1
swelling of a polysaccharide granule in boiling water or a water/polyol mixture
Implementation Method 2
partial gelatinization of the swollen polysaccharide in an alkaline solvent mixture of water and alcohol and/or polyol
Implementation Method 3
low functionalization of the partially gelatinized polysaccharide with a functionalizing agent under alkaline conditions
Implementation Method 4
complexed with a divalent cation chosen from calcium, magnesium, zinc, aluminum, copper, or combinations thereof
Data Source
AI summary
The present document describes a process for the preparation of a low functionalization polysaccharide having carboxyl groups, comprising a) swelling of a polysaccharide granule in boiling water or a water/polyol mixture, to obtain a swollen polysaccharide; b) partial gelatinization of said swollen polysaccharide in an alkaline solvent mixture of water and alcohol and/or polyol, to obtain a partially gelatinized polysaccharide; and c) partial functionalization of said partially gelatinized polysaccharide with a functionalizing agent, to obtain the low functionalization polysaccharide.