Amorphous Atorvastatin Formation via Hydroxylic Solvent Evaporation
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Solution Overview
Problem
Current processes for producing amorphous atorvastatin involve suboptimal solvents due to toxicity and environmental concerns, and lack efficiency in production capabilities, necessitating improved methods for preparation.
Innovation Solution
A process involving dissolving atorvastatin in a hydroxylic solvent followed by rapid evaporation to form amorphous atorvastatin, utilizing spray drying to achieve small particle sizes with uniform distribution and improved handling characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-hydroxylic solvents are used to form amorphous atorvastatin, then the amorphous form can be produced, but the solvent exhibits high toxicity and environmental harm
Solution Approach 1:
The patent changes the chemical parameter of the solvent from non-hydroxylic to hydroxylic, fundamentally altering the solvent's properties to reduce toxicity while maintaining the ability to form amorphous atorvastatin. This parameter change transforms the harmful non-hydroxylic solvent into a safer hydroxylic alternative.
Solution Approach 2:
The patent employs hydroxylic solvents that are safer, more environmentally friendly, and can be more easily removed or degraded compared to persistent non-hydroxylic solvents. The solvent system is designed to be less harmful and more readily eliminated from the final product.
2Productivity
If conventional solvent removal methods are used, then solvent can be removed, but production efficiency is low and particle size is large with poor flow characteristics
Solution Approach 1:
The patent incorporates solvent removal as an integrated step within the formation process itself, rather than as a separate subsequent operation. The rapid evaporation occurs concurrently with or immediately following the formation of amorphous atorvastatin, eliminating the need for separate, time-consuming solvent removal steps.
Solution Approach 2:
The patent employs rapid evaporation to quickly remove the hydroxylic solvent from the system, dramatically reducing the time required for solvent removal. This rapid process skips through what would otherwise be a slow, prolonged drying or evaporation step, thereby increasing production efficiency.
3Ease of operation
If conventional evaporation methods are used, then solvent can be removed, but the resulting particles are large and exhibit poor flow characteristics causing segregation
Solution Approach 1:
The patent changes the physical parameters of the evaporation process to produce particles with optimal size and flow characteristics. By controlling the evaporation rate and conditions, the process generates fine, uniform particles that flow well and resist segregation, rather than large, irregular particles.
Solution Approach 2:
The patent utilizes the phase transition of the hydroxylic solvent from liquid to vapor during rapid evaporation. This phase change occurs so quickly that it freezes the atorvastatin in an amorphous state with small particle size, preventing crystal growth and ensuring excellent flow characteristics.
4Ease of operation
If rapid evaporation is used to form small particles, then flow characteristics improve, but the process complexity increases
Solution Approach 1:
The patent combines multiple functions into a single integrated process step: formation of amorphous atorvastatin, removal of hydroxylic solvent, and generation of fine particles with excellent flow characteristics all occur in one rapid evaporation operation. This merging eliminates the need for separate equipment and process steps for each function.
Solution Approach 2:
The rapid evaporation process serves multiple purposes simultaneously: it removes the solvent, forms the amorphous structure, controls particle size, and ensures good flow characteristics. This multi-functional approach simplifies the overall process by using a single operation to achieve what would otherwise require multiple specialized steps.
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 use of hydroxylic solvents enables efficient production of amorphous atorvastatin with reduced toxicity, higher acceptable residual solvent levels, and improved flow characteristics, reducing segregation during manufacturing and enhancing bioavailability through rapid dissolution.
Implementation Method 1
dissolving atorvastatin in a solution comprising a hydroxylic solvent
Implementation Method 2
rapidly evaporating the hydroxylic solvent from the solution to form amorphous atorvastatin
Data Source
AI summary
Forming amorphous atorvastatin comprises the steps of dissolving atorvastatin in a hydroxylic solvent, followed by rapidly evaporating the solvent. In another aspect, a composition comprises particles of amorphous atorvastatin and a core.