Solid state transformations in consequence of electrospraying - anovel polymorphic form of piroxicam.

Maija Nyström*, Jorma Roine, Matti Murtomaa, R. Mohan Sankaran, Hélder A. Santos, Jarno Salonen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The aim of the research was to verify that electrospraying of piroxicam yielded a new polymorphic form of this drug. In the experiments. piroxicam was dissolved in chloroform and the solution was atomised electrostatically. Subsequently, the charged droplets were neutralised and dried. The solid drug particles were collected and analysed by scanning electron microscopy, X-ray diffraction, differential scanning calorimetry, high performance liquid chromatography, and infrared and Raman spectroscopy. The X-ray diffractogram measured for the electrosprayed piroxicam particles did not match with any of the known piroxicam crystal structures (Cambridge Crystallographic Data Centre). The variable temperature X-ray diffraction showed that the structure recrystallised completely into piroxicam polymorphic form I during heating. No degradation products or solvate removal was detected by high performance liquid chromatography and thermal analysis. The infrared and Raman spectra of the electrosprayed piroxicam were compared to those of form I, and some notable differences in the peak positions, shapes and intensities were detected. The results indicate that electrospraying leads to piroxicam crystallisation in a currently unknown polymorphic form. (C) 2014 Elsevier BM. All rights reserved.
Original languageEnglish
Pages (from-to)182-189
Number of pages8
JournalEuropean Journal of Pharmaceutics and Biopharmaceutics
Volume89
DOIs
Publication statusPublished - Jan-2015
Externally publishedYes

Keywords

  • Electrospraying
  • Electrostatic atomisation
  • Piroxicam
  • Polymorphism
  • XRD
  • Crystallisation
  • BETA-CYCLODEXTRIN
  • REDUCED PRESSURE
  • PROTON-TRANSFER
  • X-RAY
  • DRUG
  • WATER
  • NANOCRYSTALS
  • DISSOLUTION
  • ENVIRONMENT
  • FABRICATION
  • 317 Pharmacy

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