Aprepitant Amorphous Forms via Spray Drying
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Solution Overview
Problem
The existing forms of aprepitant have varying solid state physical properties that affect its solubility, handling, and therapeutic efficacy, necessitating the development of amorphous and crystalline forms with predictable solubility profiles for pharmaceutical applications.
Innovation Solution
The development of an amorphous form of aprepitant and polymorphic mixtures comprising specific ratios of polymorph Forms I and II, achieved through solvent dissolution and solvent removal processes, such as spray-drying, to produce a therapeutically effective pharmaceutical composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If crystalline forms of aprepitant are used, then stability is improved, but solubility deteriorates
Solution Approach 1:
The patent applies parameter changes by transforming aprepitant from crystalline to amorphous state, fundamentally altering its physical parameters. The amorphous form eliminates long-range molecular order while maintaining short-range order, resulting in increased solubility and bioavailability while preserving chemical stability through controlled preparation methods
Solution Approach 2:
The patent creates composite material systems by combining amorphous aprepitant with specific excipients and carriers that maintain its amorphous state during formulation and storage. This composite approach allows the material to achieve both high solubility and long-term stability through synergistic interactions between the amorphous active ingredient and stabilizing excipients
2Quantity of substance
If amorphous form of aprepitant is used, then solubility is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent utilizes phase transitions by employing spray drying technology that rapidly transitions aprepitant from dissolved liquid phase to amorphous solid phase. This controlled phase transition occurs through rapid solvent evaporation, locking the molecules in an amorphous configuration and achieving consistent solubility enhancement with reproducible manufacturing outcomes
Solution Approach 2:
The patent applies preliminary action by pre-dissolving aprepitant in appropriate solvents before the drying step, ensuring complete dissolution and homogeneous distribution. This preliminary dissolution step is critical for achieving consistent amorphous form formation during subsequent rapid drying, thereby improving manufacturing precision
3Ease of manufacture
If polymorphic mixtures are used, then ease of manufacture is improved, but solubility deteriorates
Solution Approach 1:
The patent applies parameter changes by shifting from crystalline polymorphic forms to amorphous form, fundamentally changing the physical state parameter. This transformation increases solubility by eliminating crystal lattice energy requirements, while the spray drying process provides a straightforward manufacturing approach that balances ease of manufacture with enhanced solubility
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 amorphous and polymorphic forms of aprepitant exhibit enhanced solubility and stability, ensuring predictable therapeutic outcomes and improved handling characteristics, making them suitable for pharmaceutical formulations.
Implementation Method 1
providing a solution comprising aprepitant in one or more solvents capable of dissolving the aprepitant
Implementation Method 2
substantially removing the solvent from the solution to provide amorphous aprepitant
Implementation Method 3
solvent removal processes, such as spray-drying
Data Source
AI summary
An amorphous form of aprepitant and a process for its preparation is provided. Also provided are mixtures of polymorph Forms I and II of aprepitant and a process for the preparation thereof.