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Solid-State Form Characterization of Riparin I.

Elisana Afonso de Moura1, Márcio Vinícius Cahino Terto2, Elisângela Afonso de Moura Mendonça3

  • 1Pharmaceutical Sciences Departament, Federal University of Paraíba, University City, João Pessoa PB 58059-970, Brazil. elisanamoura@yahoo.com.br.

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Summary

Solid-state characterization of Riparin I revealed batch-to-batch variability in crystal habits and impurities, impacting drug development. Controlling synthesis reproducibility is crucial for consistent riparin I morphology and therapeutic efficacy.

Keywords:
pharmaceutical analysisriparin Isolid-state characterization

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Area of Science:

  • Pharmaceutical Sciences
  • Solid-State Chemistry
  • Drug Development

Background:

  • Riparin I, an alkamide, shows promise for anxiolytic effects in preclinical research.
  • Solid-state properties are critical for successful drug development and formulation.
  • Understanding batch consistency is vital for pharmaceutical quality control.

Purpose of the Study:

  • To characterize the solid-state properties of five Riparin I batches.
  • To identify potential variations in crystal habit and purity among different batches.
  • To assess the impact of synthesis reproducibility on Riparin I's solid-state characteristics.

Main Methods:

  • Utilized Scanning Electron Microscopy (SEM), Differential Scanning Calorimetry (DSC), Thermogravimetry (TG), Fourier Transform Infrared (FTIR), Pyrolysis-Gas Chromatography/Mass Spectrometry (Pyr-GC/MS), X-ray Powder Diffraction (PXRD), and Solid-State Nuclear Magnetic Resonance (ssNMR).
  • Analyzed five distinct batches of Riparin I (RIP-1 to RIP-5) produced via identical synthesis routes.
  • Focused on identifying differences in crystallinity, morphology, and potential impurities.

Main Results:

  • Observed variations in crystal habits and crystallization impurities, potentially linked to triethylamine presence.
  • Differential Scanning Calorimetry (DSC) showed distinct fusion endotherms for RIP-2 and RIP-3, indicating mixed crystalline forms.
  • X-ray Powder Diffraction (PXRD) and Solid-State Nuclear Magnetic Resonance (ssNMR) confirmed significant differences in crystallinity among the batches.

Conclusions:

  • Batch variations in Riparin I solid-state properties, particularly crystallinity and morphology, were confirmed.
  • Synthesis reproducibility is essential for achieving consistent Riparin I quality and therapeutic potential.
  • Addressing these variations is key to preventing future quality control issues in Riparin I drug products.