Dry Mechanical Coating for Pharmaceutical Blend Flowability
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Solution Overview
Problem
Current methods for enhancing the flowability and compaction properties of pharmaceutical blends with low active pharmaceutical ingredient (API) loadings and fine particle sizes are inefficient, often requiring additional processing steps and excessive amounts of silica, which can lead to quality issues and increased manufacturing costs.
Innovation Solution
A solventless dry mechanical coating method that selectively coats a minor component of the blend with nano-sized powders in low amounts, enhancing flowability, bulk packing density, and compaction properties without the need for wet or dry granulation, using minimal silica concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wet granulation or dry granulation is used to improve flowability and bulk density, then the blend properties are enhanced, but additional equipment and processing steps are required, increasing manufacturing complexity and cost
Solution Approach 1:
The invention changes the physical-chemical parameters of the powder blend by incorporating surface coating agents that modify particle surface properties. This alters the interparticle forces and surface characteristics to achieve improved flowability and bulk density without requiring granulation processing
Solution Approach 2:
The invention extracts the essential function of granulation (improving flowability and bulk density) and achieves it through a simpler alternative method using surface coating agents, eliminating the need for complex granulation equipment and multiple processing steps
2Reliability
If conventional amounts of silica are added to improve flowability, then the blend flows better, but excessive silica leads to quality issues and increased costs
Solution Approach 1:
The invention changes the effectiveness parameter of silica by applying surface coating technology, which enhances the flow-promoting efficiency of silica particles. This allows achieving the same flowability improvement with significantly reduced silica concentration in the blend
Solution Approach 2:
The surface coating agents act as intermediaries that amplify the effect of small amounts of silica, enabling enhanced flowability with minimal silica addition by mediating the interaction between silica particles and the powder blend
3Speed
If finer sized drug powders are used to improve drug dissolution, then the dissolution rate increases, but achieving desired blend properties becomes more challenging
Solution Approach 1:
The invention changes the surface parameters of fine drug particles through coating with surface coating agents, which modifies particle surface energy, roughness, and interparticle forces. This resolves the blendability issues inherent to fine particles while preserving their rapid dissolution advantage
Solution Approach 2:
The invention applies surface coating selectively to modify only the surface properties of fine drug particles, maintaining their core fine-particle characteristics for rapid dissolution while adding surface modifications that improve blend flowability and handling
4Reliability
If well-flowing excipients are used to improve flowability, then the blend flows better, but downstream segregation of APIs and excipients is promoted
Solution Approach 1:
The invention changes the surface parameters of excipients through coating, adjusting surface energy and particle characteristics to match those of the API. This reduces the density and surface property differences between components, minimizing segregation while maintaining improved flowability
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
This approach achieves significant synergistic improvements in flowability, bulk density, and compaction strength, even at low API loadings, reducing processing burdens and costs while maintaining tablet strength and dissolution rates.
Implementation Method 1
A solventless dry mechanical coating method that selectively coats a minor component of the blend with nano-sized powders in low amounts
Data Source
AI summary
High (greater than 30%) and/or low (less than 10%) loaded multiple API powdered/nanoparticle were tabulated with increased flowability and physical properties. Properties include blend flowability and uniformity, bulk packing density, compactability, tensile strength, and dissolution. Blending is done through solventless dry mechanical coating of at least one minority API component defined as the API component with the least weight per volume surface coated with nano-sized powders in lesser amounts by wt % of the blend, and preferably less than 10% dry coated of the minority API. An excipient may be dry coated in the lesser amount wherein the excipient is a minority component. Both minority excipient and minority API may be dry coated. Using dry coating instead of dry granulation and/or wet granulation techniques in producing tablets saves manufacturing steps, costs, and produces higher quality tablets with surprisingly higher properties than expected for low flowability solid powdered ingredients.