Prof. Ashwini Nangia's Research Group

Recent Publication:

Pefloxacin (PEF) is an amphoteric, antibacterial drug which exists as a neutral molecule in the crystal structure stabilized by C–H···O and C–H···F interactions. The design of multicomponent solids using crystal engineering was undertaken in a cocrystal / salt screen of PEF with GRAS dicarboxylic acids to improve the solubility and phase stability of the drug. Ten multicomponent forms, namely five salts, two salt hydrates, and three salt-cocrystals were crystallized by liquidassisted grinding followed by crystallization. In some cases, salt and salt-cocrystals were obtained concomitantly during solution evaporative crystallization. Single crystal X-ray diffraction showed that the structures are stabilized by N+ –H···O , O–H···O, C–H···O, C–H···F and π- π stacking interactions. The bulk phase purity of multicomponent forms was characterized by powder X-ray diffraction, spectroscopy and thermal techniques. The salt /salt-cocrystal forms exhibit faster dissolution rate and higher solubility compared to pure PEF in pH 1.2 (acidic, like gastric environment) and pH 7 phosphate buffer media (neutral, like intestinal passage). Specifically, PEF+ -SA– salt showed remarkably high solubility, dissolution rate and stability compared to the other multicomponent forms and PEF neutral form. The drug formulation compatible pefloxacin succinate is a promising soluble and stable PEF salt.

Authors: Anilkumar GunnamKuthuru Suresh, and Ashwini Nangia*

1School of Chemistry, University of Hyderabad, Hyderabad 500 046, India

2Council of Scientific and Industrial Research National Chemical Laboratory, Pune       411 008, India

 *Correspondence e-mail:


 Publication date : March 26th, 2018

Recent Announcements

  • Section editor of Acta Crystallographica Section B Wrriten by Prof. Desiraju: It's a pleasure to record the appointment of Prof. Ashwini Kumar Nangia, Director, National Chemical Laboratory, Pune as a main editor of Acta Crystallographica Section ...
    Posted May 19, 2017, 3:18 AM by Ashwini Nangia
  • Twenty-Fourth Congress and General Assembly of the International Union of Crystallography India will host the 24th Congress & General Assembly of the International Union of Crystallography 2017 from 21 – 28 August 2017. We extend a warm welcome to all crystallographers from across ...
    Posted Sep 8, 2016, 5:11 PM by Ashwini Nangia
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