Mixed-Crystal Seeding for Hidden Polymorph Screening
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Solution Overview
Problem
Current methods for polymorphic screening are inadequate in accessing latent polymorphic diversity, as many compounds have been crystallized under diverse conditions yet only one form has been observed, and computational predictions are unreliable for large or complex molecules, limiting the discovery of new crystalline forms.
Innovation Solution
A method involving mixed-crystal seeding is introduced, where a library of mixed-crystal seeds, each consisting of a target compound and a structurally analogous compound, is used to induce crystallization, followed by monitoring and characterizing the formed crystals using techniques like X-ray diffraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional crystallization methods are used, then the process is simple and well-established, but the ability to access latent polymorphic diversity is insufficient
Solution Approach 1:
The patent introduces mixed-crystal seeds as an intermediary substance that facilitates polymorphic screening. These seeds contain both the target compound and a structurally analogous compound, acting as a mediator to induce crystallization of polymorphs that would not form through conventional seeding methods alone
Solution Approach 2:
The patent employs composite mixed-crystal seeds composed of two different compounds (target compound and structurally analogous compound). This composite approach allows the seeds to induce multiple polymorphic forms simultaneously, enhancing the versatility of the screening method while managing complexity through a unified seed structure
2Measurement precision
If computational predictions are used for polymorph screening, then the process can identify potential forms, but the predictions are unreliable for large or complex molecules
Solution Approach 1:
The patent employs experimental mixed-crystal seeding that allows the system to self-determine polymorphic forms through direct crystallization experiments rather than relying on computational predictions. The mixed-crystal seeds themselves guide the crystallization process, making the method self-sufficient and applicable to any molecule size or complexity
Solution Approach 2:
The patent replaces the computational prediction system with an experimental crystallization system using mixed-crystal seeds. This substitution eliminates the reliability limitations of computational methods for large molecules by using direct physical crystallization experiments that work universally across all molecule sizes and complexities
3Adaptability or versatility
If exhaustive crystallization examinations are performed to uncover all polymorphic forms, then the range of discovered forms increases, but the time and resources required increase significantly
Solution Approach 1:
The patent uses pre-prepared mixed-crystal seeds that have been designed to induce specific polymorphic forms. By performing the preliminary action of creating these specialized seeds, the method accelerates the discovery process, allowing researchers to target specific polymorphs without conducting exhaustive examinations of all possible crystallization conditions
Solution Approach 2:
The patent changes the compositional parameter of the seeding material by using mixed-crystal seeds containing both target and analogous compounds. This parameter change enables the induction of multiple polymorphic forms through a single seeding approach, reducing the need for exhaustive screening across numerous conditions and thereby saving time and resources
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 approach enhances the discovery of new polymorphic forms by introducing structural diversity, allowing for the identification of previously undiscovered polymorphs through the formation of mixed crystals suitable for structural analysis.
Implementation Method 1
introducing the mixed-crystal seed into a crystallization medium comprising the target compound, under conditions suitable for crystallization of the target compound
Implementation Method 2
characterizing the crystals of the target compound
Implementation Method 3
characterizing the crystals of the target compound
Data Source
AI summary
A method for screening a target compound for polymorphic forms is provided. The method comprises providing a library of mixed-crystal seeds, each mixed-crystal seed consisting essentially of the target compound and at least one structural analog that is structurally analogous to the target compound; and for each mixed-crystal seed: introducing the mixed-crystal seed into a crystallization medium comprising the target compound, under conditions suitable for crystallization of the target compound; monitoring the formation of crystals of the target compound; and when formed, characterizing the crystals of the target compound.