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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Combining Surface Templating and Confinement for Controlling Pharmaceutical Crystallization.

Manali Banerjee1, Blair Brettmann1,2

  • 1School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.

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|October 23, 2020
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Summary
This summary is machine-generated.

Controlling active pharmaceutical ingredient (API) crystal forms is key for oral drug development. Combining surface templating with confinement offers enhanced control over drug polymorphism, size, and habit for improved solubility and bioavailability.

Keywords:
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Area of Science:

  • Pharmaceutical Science
  • Materials Science
  • Chemical Engineering

Background:

  • Poor water solubility of active pharmaceutical ingredients (APIs) presents a significant challenge in developing effective oral dosage forms.
  • Polymorphism, crystal size, and habit variations in APIs critically impact their dissolution properties and bioavailability.
  • Existing methods like surface templating and confinement offer partial control over API crystallization, but combined approaches remain underexplored.

Purpose of the Study:

  • To review advances in controlling API crystallization by combining surface templating and confinement methods.
  • To highlight the potential of integrated approaches for superior control over drug polymorph formation, crystal size, and habit.
  • To provide a perspective on the future development of rationally designed systems for API nucleation.

Main Methods:

  • Review of literature on heterogeneous crystallization on surfaces and crystallization under confinement.
  • Analysis of combined crystallization strategies utilizing templated surfaces and confined spaces.
  • Discussion of template design incorporating surface functionality and porous structures for particle confinement.

Main Results:

  • Combined crystallization methods, integrating surface templating and confinement, offer enhanced control over API crystallization.
  • Designed templates can simultaneously control surface functionality and particle confinement within porous structures.
  • These integrated systems show significant potential for optimizing drug polymorph, crystal size, and habit.

Conclusions:

  • Combining surface templating with confinement represents a promising strategy for controlling API crystallization.
  • This integrated approach leverages the advantages of both individual techniques for rational API nucleation system design.
  • Future research should focus on developing and applying these combined methods to enhance API solubility and bioavailability.