title: Crystallization of a non-steroidal anti-inflammatory drug from ethanol-water solution in presence of polymers: physicochemical characterization and release behaviour from suppositories.
abstract: Altered crystallization condition has been designed and adopted to a model non-steroidal anti-inflammatory drug, while crystallizing from ethanol-water solution in absence and presence of polymers such as Eudragit RS and ethylcellulose. To minimize the gastro-intestinal side effects nimesulide was considered as a model drug candidate for the development of suppository formulation. Physicochemical characteristics of the crystals were evaluated by Scanning Electron Microscopy (SEM). X-ray diffraction (XRD) and Fourier Transformed Infrared Spectroscopy (FT-IR). Smoothness and sharpness of the crystal have been decreased with increased concentration of a polymer. A little change in crystal habit and geometry has also been observed. Crystals are discrete in nature and more than 90% were in the range of 20-90 micron. The X-ray diffractions of nimesulide crystallized in absence of polymer and physical mixture of drug-polymer revealed fewer high intensity reflections when compared with the drug crystallized in presence of Eudragit RS, which testified a slight decreased ordering of crystal lattice in the latter. In presence of ethylcellulose, slightly increased ordering of crystal lattice was observed. No strong interactions were noticed as revealed by FT-IR spectroscopy. Drug dissolution rate from suppository formulations containing nimesulide crystallized in presence of polymer was found to delay as compared with the suppository prepared by nimesulide crystallized in absence of polymer.
authors.affiliation: Department of Pharmaceutical Sciences, Jharpokharia, Mayurbhanj-757 086, Orissa, India. smallick@yahoo.co.in
authors.forename: Subrata
authors.initials: S
authors.lastname: Mallick
authors.forename: Pintu K
authors.initials: PK
authors.lastname: Dey
authors.forename: Santanu
authors.initials: S
authors.lastname: Sannigrahi
authors.forename: Avishek
authors.initials: A
authors.lastname: Mitra
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003460:Crystallization; D003692:Delayed-Action Preparations; D000431:Ethanol; D011108:Polymers; D012997:Solvents; D017550:Spectroscopy, Fourier Transform Infrared; D013488:Suppositories; D014867:Water; D014961:X-Ray Diffraction
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D003692:Delayed-Action Preparations; D011108:Polymers; D012997:Solvents; D013488:Suppositories; D014867:Water; D000431:Ethanol