Delamanid Solid Dispersion via Hot-Melt Extrusion
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Solution Overview
Problem
Delamanid, a poorly water-soluble compound, poses challenges in achieving high solubility and oral absorbability due to its poor thermal stability and the requirement for high-temperature treatment in hot-melt extrusion processes, which risks thermal degradation.
Innovation Solution
A solid dispersion comprising delamanid combined with specific vinyl polymers, such as polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol graft copolymers, and cellulose compounds, like hydroxypropyl methylcellulose phthalates, is developed, allowing for improved solubility and stability through hot-melt extrusion without high-temperature treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hot-melt extrusion is used to produce solid dispersion, then continuous processing and scalability are improved, but thermal degradation of delamanid occurs due to high treatment temperature
Solution Approach 1:
The patent changes the temperature parameter of the hot-melt extrusion process from conventional high temperatures (typically 150-200°C) to a lower temperature range (100-190°C, preferably 120-180°C). This parameter modification allows the process to maintain continuous processing capabilities while preventing thermal degradation of delamanid, whose melting point and decomposition point are close to each other at about 195°C.
Solution Approach 2:
The patent employs composite materials by combining delamanid with specific polymer carriers (polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol graft copolymers and vinyl pyrrolidone-vinyl acetate copolymers) that have appropriate melting points and thermal stability. This composite formulation enables the drug to be processed at lower temperatures while maintaining the benefits of hot-melt extrusion technology.
2Reliability
If treatment temperature is lowered to reduce thermal degradation risk, then drug stability is improved, but crystalline drug residues remain which reduce solubility
Solution Approach 1:
The patent modifies process parameters including temperature (100-190°C), residence time (optimized for complete melting), and polymer-to-drug ratio (1:1 to 1:20) to ensure complete melting and amorphization of delamanid even at lower temperatures. These parameter changes prevent crystalline drug residues while maintaining drug stability.
Solution Approach 2:
The patent uses polymer carriers as intermediaries that facilitate complete dissolution and amorphization of delamanid at lower temperatures. The specific polymers (polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol graft copolymers and vinyl pyrrolidone-vinyl acetate copolymers) act as mediators that prevent crystallization and ensure homogeneous amorphous dispersion.
3Stability of the object's composition
If amorphous form is used to improve solubility, then oral absorbability is improved, but instability of amorphous form increases
Solution Approach 1:
The patent creates a stable composite material by combining delamanid with specific polymer carriers in defined ratios. The polymers (polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol graft copolymers and vinyl pyrrolidone-vinyl acetate copolymers) form a stable matrix that maintains the amorphous state of delamanid, preventing crystallization while preserving enhanced solubility and oral absorbability.
Solution Approach 2:
The patent applies local quality by creating a homogeneous amorphous dispersion of delamanid within the polymer matrix at the molecular level. This local amorphization throughout the entire formulation ensures both improved solubility and enhanced stability, as each drug molecule is locally stabilized by the polymer environment.
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 solid dispersion achieves excellent solubility and stability of delamanid, reducing the risk of thermal degradation while maintaining the benefits of hot-melt extrusion, such as cost-effectiveness and environmental sustainability.
Implementation Method 1
Methods for producing a solid dispersion include coprecipitation, spray drying, hot-melt extrusion, and the like. Hot-melt extrusion (HME) is applicable to continuous processes
Implementation Method 2
Among these, amorphous forms are a highly practical formulation technology; one approach to improve the instability of amorphous forms includes a solid dispersion technology
Data Source
Figure 1
AI summary
Disclosed is a solid dispersion comprising the following components (a), (b), and (c): (a) delamanid; (b) at least one member selected from the group consisting of polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol graft copolymers and vinyl pyrrolidone-vinyl acetate copolymers; and (c) at least one member selected from the group consisting of hydroxypropyl methylcellulose phthalates and hydroxypropyl methylcellulose acetate succinates.