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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Mapping the pharmaceutical design space by amorphous ionic liquid strategies.

Johannes Wiest1, Marco Saedtler1, Anja Balk1

  • 1Institute for Pharmacy and Food Chemistry, Am Hubland, 97074 Würzburg, Germany.

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|November 4, 2017
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Summary

Researchers developed novel amorphous ionic liquids to improve the oral absorption of Selurampanel, a poorly water-soluble migraine drug. This excipient-free formulation significantly enhanced drug release and bioavailability, offering better patient outcomes.

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Area of Science:

  • Pharmaceutical Sciences
  • Drug Delivery Systems
  • Medicinal Chemistry

Background:

  • Poor water solubility of active pharmaceutical ingredients (APIs) presents a major challenge in drug formulation, limiting oral bioavailability and patient access.
  • Selurampanel, a drug for migraine treatment, suffers from poor water solubility, necessitating advanced formulation strategies for effective therapeutic delivery.
  • Amorphous ionic liquids (AILs) offer a promising avenue for enhancing the solubility and dissolution of poorly soluble drugs.

Purpose of the Study:

  • To systematically synthesize and characterize a library of sterically demanding counterions for creating AILs.
  • To map the pharmaceutical design space of AILs for Selurampanel, focusing on improving oral absorption and therapeutic efficacy.
  • To establish predictive algorithms linking counterion structure to key pharmaceutical performance metrics.

Main Methods:

  • Synthesis of 36 novel sterically demanding counterions.
  • Formulation of Selurampanel into amorphous ionic liquids (AILs).
  • Evaluation of AILs for flux, supersaturation period, and hygroscopicity.
  • Correlation of molecular counterion descriptors with pharmaceutical outcomes.
  • In vivo pharmacokinetic studies to assess bioavailability and release profiles.

Main Results:

  • Achieved 30- to 800-fold improvements in supersaturation period and drug flux compared to crystalline Selurampanel.
  • Demonstrated tunable drug release profiles, ranging from immediate to sustained, through counterion structural optimization.
  • Established predictive algorithms for AIL performance based on counterion properties.
  • Observed in vivo profiles correlating with AIL structure, showing rapid bioavailability and high Cmax, or sustained release patterns.

Conclusions:

  • The study successfully mapped the pharmaceutical design space for excipient-free AIL formulations of Selurampanel.
  • Optimized AILs significantly enhance the oral absorption and therapeutic potential of poorly water-soluble drugs.
  • Ionic liquid design presents a powerful strategy for developing advanced drug delivery systems with predictable performance.