Ethylcellulose Binder for Rapid Disintegration Tablets
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Solution Overview
Problem
Existing rapidly disintegrating tablet formulations face challenges in minimizing disintegration times, friability, and hygroscopicity while maintaining mechanical robustness and stability, particularly when using disintegrants that are poorly compressible and hygroscopic, leading to stability issues and poor handling properties.
Innovation Solution
The use of ethylcellulose as a water-insoluble binder at levels of 1 to 20% by weight, combined with disintegrants like cross-linked povidone and sodium starch glycollate, to create a rapidly disintegrating, low friable tablet formulation that is non-hygroscopic and robust, allowing for direct compression and rapid disintegration without compromising mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If high levels of hydrophilic disintegrants are used to achieve rapid disintegration, then disintegration time is reduced, but tablet friability increases and hygroscopicity worsens
Solution Approach 1:
The patent combines hydrophilic disintegrants (for rapid disintegration) with hydrophobic ethylcellulose binder (for reduced hygroscopicity and improved mechanical strength). This composite formulation allows the tablet to disintegrate rapidly upon contact with saliva while the ethylcellulose protects the tablet from atmospheric moisture during storage and handling, resolving the contradiction between rapid disintegration and tablet stability.
2Strength
If common water soluble binders are added to improve tablet compactibility, then mechanical strength increases, but disintegration time increases due to gel formation
Solution Approach 1:
Instead of using conventional water-soluble binders that gel and retard disintegration, the patent inverts the approach by using a water-insoluble ethylcellulose binder. This binder provides mechanical strength without forming gels that would prevent rapid disintegration, as it remains intact during the disintegration process and does not interfere with the disintegrant's swelling action.
3Duration of action of moving object
If disintegrants are increased to minimize disintegration time, then disintegration performance improves, but tablet compactibility deteriorates
Solution Approach 1:
The patent creates a composite system where ethylcellulose binder compensates for the poor compactibility of high levels of disintegrants. The ethylcellulose provides the necessary binding strength and mechanical integrity, allowing the formulation to use high levels of disintegrants (5% or more) without compromising tablet manufacturability, thus enabling rapid disintegration while maintaining ease of manufacture.
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 ethylcellulose-based formulation achieves rapid disintegration times of less than 60 seconds, low friability of less than 1%, and low hygroscopicity, enhancing the mechanical robustness and stability of the tablets, making them suitable for effective delivery of active ingredients in the oral cavity.
Implementation Method 1
an ethylcellulose binder which is co-formulated with typical disintegrants
Implementation Method 2
high level (5% or more by weight) of a hydrophilic, highly swellable disintegrant
Data Source
AI summary
A rapidly disintegrating, orally administered tablet or compressed dosage form, comprising ethylcellulose (EC) as a directly compressible binder which enhances tablet robustness as manifested by improved strength, lower friability, lower hygroscopicity and yet, hydrophobic nature notwithstanding, does not retard disintegration, but shortens disintegration time or is disintegration time neutral when co-formulated with disintegrants and other water-soluble excipients such as sugar alcohols.