Low-Substituted Hydroxypropylcellulose Compressibility Flowability
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Solution Overview
Problem
Conventional low-substituted hydroxypropylcellulose used in pharmaceutical and food preparations lacks sufficient flowability and disintegration properties, requiring additional additives and limiting its application in direct tableting and oral disintegration.
Innovation Solution
Development of low-substituted hydroxypropylcellulose with a crystallinity of 60% or less, a degree of hydroxypropoxyl substitution of 5 to 9%, and an aspect ratio of less than 2.5, achieved through a specific preparation method involving mixing with sodium hydroxide, propylene oxide reaction, and subsequent compaction and grinding, enhancing compressibility, flowability, and disintegration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional low-substituted hydroxypropylcellulose is used, then compressibility is improved, but flowability deteriorates due to fibrous particles
Solution Approach 1:
The invention changes the physical and chemical parameters of low-substituted hydroxypropylcellulose by controlling the degree of substitution (5-9% by weight), crystallinity (60% or less), and aspect ratio (less than 2.5). These parameter changes transform the material from a fibrous form with poor flowability to a granular form with excellent flowability while maintaining compressibility, enabling direct tableting without additional flowability additives.
2Strength
If conventional low-substituted hydroxypropylcellulose is used, then compressibility is improved, but disintegration deteriorates
Solution Approach 1:
The invention optimizes the crystallinity parameter to 60% or less and controls the degree of substitution at 5-9% by weight. These parameter changes create a unique structure that provides both high compressibility for tablet formation and rapid disintegration upon contact with water, resolving the contradiction between maintaining tablet integrity and achieving rapid disintegration.
3Strength
If low-substituted hydroxypropylcellulose with high degree of substitution is used, then compressibility is improved, but swellability deteriorates
Solution Approach 1:
The invention precisely controls the degree of hydroxypropoxyl substitution within the range of 5-9% by weight. This optimized substitution level maintains sufficient compressibility for tablet formation while preserving the hydrophilic properties necessary for rapid water absorption and swelling, thereby enabling quick disintegration without requiring additional additives.
4Stability of the object's composition
If conventional low-substituted hydroxypropylcellulose is used, then stability is improved due to non-ionic nature, but flowability deteriorates requiring additional additives
Solution Approach 1:
The invention transforms the physical form of low-substituted hydroxypropylcellulose by controlling particle morphology to achieve an aspect ratio of less than 2.5 and crystallinity of 60% or less. This creates a free-flowing granular material that maintains the chemical stability and non-ionic nature of the original substance while eliminating fibrous aggregation, enabling direct use in formulations without additional flowability additives.
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 resulting low-substituted hydroxypropylcellulose exhibits improved compressibility, flowability, and disintegration, enabling the production of high-hardness tablets with rapid disintegration, suitable for oral administration without water, particularly beneficial for the elderly and children.
Implementation Method 1
low-substituted hydroxypropylcellulose which is water-insoluble and swellable when it absorbs water
Implementation Method 2
low-substituted hydroxypropylcellulose which is water-insoluble and swellable when it absorbs water
Implementation Method 3
the crystallinity is calculated based on the diffraction intensity by wide-angle X-ray diffraction measurement
Data Source
AI summary
Provided is nonionic and excellently stable low-substituted hydroxypropylcellulose having improved compressibility and flowability, and further having improved disintegration and texture in oral cavity. More specifically provided is low-substituted hydroxypropylcellulose having a crystallinity of 60% or less, a degree of hydroxypropoxyl substitution of 5 to 9% by weight, and an aspect ratio of less than 2.5, wherein the crystallinity is calculated based on a diffraction intensity by wide-angle X-ray diffraction measurement according to the following formula (1):Crystallinity(%)={(Ic−Ia)/Ic}×100 (1)wherein Ic means a diffraction intensity at a diffraction angle 2θ of 22.5° and Ia means a diffraction intensity at a diffraction angle 2θ of 18.5°.