Capsule Formulation for Rapid Dissolution of Spray-Dried Dispersions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rapid release of spray dried dispersions in capsules is hindered by water ingress leading to wetting and gelation of the dispersion polymer, resulting in slow dispersal and dissolution in aqueous environments, particularly for amphiphilic polymers like HPMC and HPMCAS.
Innovation Solution
Incorporation of an osmogen, such as highly water-soluble excipients, and a glidant into the capsule formulation to reduce water activity and prevent gelation, combined with granulation of the dispersion to minimize surface area, ensuring rapid dispersal upon capsule dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If spray dried dispersion is filled into capsule, then rapid release is achieved, but water ingress causes wetting and gelation of dispersion polymer leading to slow dispersal
Solution Approach 1:
A hydrophilic binder or surfactant is introduced as an intermediary substance between the dispersion polymer and water. This intermediary modifies the water-polymer interaction to prevent unwanted gelation while allowing controlled release, thus resolving the contradiction between rapid release and reliable dispersal
Solution Approach 2:
The formulation modifies the physical-chemical parameters of the dispersion system by adjusting polymer concentration, molecular weight, or adding co-solvents to change the gelation threshold and wetting characteristics, enabling rapid release without compromising dispersal reliability
2Stability of the object's composition
If amphiphilic polymer is used in dispersion, then solubility is improved, but hydrogel formation occurs upon water ingress causing slow dissolution
Solution Approach 1:
The dispersion is pre-formulated with optimized polymer concentration and composition before encapsulation to establish a stable yet rapidly dissolving structure. This preliminary optimization ensures that when water enters the capsule, the polymer dissolves quickly without forming gels, maintaining both solubility and dissolution speed
Solution Approach 2:
The formulation uses composite material strategies by combining amphiphilic polymers with hydrophilic excipients or surfactants in specific ratios. This composite approach leverages the solubility-enhancing properties of amphiphilic polymers while the added components prevent gelation, resolving the contradiction between stability and dissolution speed
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 formulation enables rapid dispersal and dissolution of the dispersion particles, achieving solubilized active concentrations comparable to or exceeding unencapsulated suspensions, with improved bioavailability of active agents.
Implementation Method 1
Mechanistically, it is believed that the small excipients - for example, a highly water-soluble inorganic salt, sugar or sugar alcohol - quickly dissolve upon wetting once water begins to penetrate the capsule shell, lowering the water activity of the aqueous use media in contact with the dispersion-containing particles
Implementation Method 2
Simultaneously, granulating the dispersion into larger particles reduces the surface area per unit mass of the dispersion, and also reduces the propensity of the dispersion to gel
Data Source
Figure 1~2
Figure 3~4
AI summary
Disclosed are dosage forms comprising a capsule and a fill material, comprising (a) a fill material comprising a dispersion of an active agent and a polymer, the dispersion being granulated, (b) an osmogen, and (c) a glidant. In one embodiment, the dispersion comprises 10 wt% to 90 wt% of the fill material, the osmogen comprises from 5 wt% to 40 wt% of the fill material, and the glidant comprises at least 0.1 wt% of the fill material.