Microgravity Crystallization for Small Molecule APIs
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Solution Overview
Problem
Current methods for crystallizing small molecules, such as active pharmaceutical ingredients (APIs), fail to produce high-quality single crystals, particularly for molecules like vilanterol, which is a selective long-acting beta2-adrenergic agonist, due to limitations in crystal morphology and polymorph formation, and existing methods are not applicable to small molecules as they are for macromolecules.
Innovation Solution
A method involving crystallization of molecules with a molecular weight equal to or lower than 500 Dalton in a microgravity environment with gravitational acceleration ranging from 0.01 g to 0.000001 g, followed by transferring the crystalline polymorphs to a 1 g environment, using techniques like gradual cooling or addition of an anti-solvent to achieve optimal crystallization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional crystallization methods are used on Earth, then the process is simple and controllable, but the crystal quality and morphology are insufficient
Solution Approach 1:
The patent transitions the crystallization process from Earth's 1g environment to the microgravity dimension of space, fundamentally changing the physical conditions. This dimensional change eliminates gravity-driven convection and sedimentation, allowing molecules to arrange into higher-quality crystals with superior morphology and polymorph formation that cannot be achieved on Earth.
Solution Approach 2:
The patent changes the gravitational acceleration parameter from 1g on Earth to microgravity (0.000001g to 0.01g) in space. This parameter change fundamentally alters the crystallization dynamics, enabling the formation of high-quality single crystals with improved morphology and access to new polymorphic forms that are inaccessible under normal Earth gravity conditions.
2Manufacturing precision
If known crystallization methods are applied to small molecules, then the process follows standard procedures, but optimal crystals for formulation or crystallography cannot be obtained
Solution Approach 1:
The patent applies parameter changes by shifting the gravitational environment from 1g to microgravity, which fundamentally alters the crystallization behavior of small molecules. This enables the formation of optimal crystals with superior morphology and polymorph diversity that cannot be achieved through conventional Earth-based methods, directly addressing the inability to obtain formulation-quality crystals.
Solution Approach 2:
The patent creates an equipotential environment by eliminating gravitational gradients in microgravity. This uniform potential field prevents gravity-induced convection and sedimentation, allowing molecules to diffuse and arrange uniformly throughout the solution, resulting in crystals with superior morphology and internal order that are essential for both formulation and crystallography applications.
3Manufacturing precision
If microgravity crystallization is performed, then superior crystal quality is achieved, but the process requires space environment access
Solution Approach 1:
The patent utilizes the space environment's microgravity dimension to achieve superior crystallinity. By conducting crystallization in the microgravity dimension rather than Earth's 1g environment, the method accesses physical conditions that produce higher-quality crystals with improved morphology and polymorph formation, justifying the complexity of space environment access.
Solution Approach 2:
The patent changes the gravitational parameter to microgravity levels, which fundamentally improves crystal quality metrics including crystallinity, morphology, and polymorph diversity. This parameter change, while requiring space environment access, produces results that are unachievable through any Earth-based crystallization method, making the environmental control requirements necessary rather than optional.
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 method results in high-quality crystals with improved morphology and polymorph formation, as demonstrated by the successful crystallization of vilanterol in space and subsequent seeding on Earth, producing crystals with superior crystallinity and larger size, enhancing drug formulation properties.
Implementation Method 1
crystallization is performed at a gravity below about 0.01 g to about 0.000001 g, e.g., in outer-space
Implementation Method 2
crystalizing molecules of the molecular substance in the microgravity environment... by cooling a saturated solution of the molecule
Implementation Method 3
cooling a saturated solution of the molecule, by reacting the solution of the molecules with a solution containing ions, thereby forming an insoluble salt of the molecule, or by changing the pH of a solution comprising the molecules, thereby causing the molecules to precipitate in crystalline form
Implementation Method 4
crystalizing molecules of the molecular substance in the microgravity environment... by adding an anti-solvent to a solution of the molecules, by cooling a saturated solution of the molecule
Data Source
AI summary
Disclosed is a method for crystallizing molecules having a molecular weight equal to or lower than about 500 Dalton in a gravity below about 0.01 g to about 0.000001 g as well as to crystalline molecules having a molecular weight equal to, or lower than, about 500 Dalton, prepared under microgravity conditions.