title: The role of several l-HPCs in preventing tablet capping during direct compression of metronidazole.
abstract: Several low-hydroxypropyl cellulose (l-HPC) derivatives (LH-11, 21, 22, 31, and 32) differing in granulometric particle size or in hydroxypropyl content were considered in the present study. The l-HPC grades were characterized as pure powders, in order to determine both compression and densification behavior, in presence or in absence of magnesium stearate as lubricant, and then, were physically mixed in different proportions with metronidazole, which was also previously characterized as pure powder. The tabletability and compressibility of these binary mixtures were then evaluated, in presence or in absence magnesium stearate as lubricant at two different compression speeds (20 and 70 mm/sec). It was observed that both binary mixture compression behavior and capping tendency were influenced by compression speed and by the presence of lubricant. Differences in anti-capping efficiency between the l-HPCs may be related to their hydroxypropyl content. This parameter influences the interaction between the metronidazole and the polymer particles, and consequently the ability of the binary system to undergo densification under compression.
authors: Dipartimento di Scienze Chimiche, Laboratorio di Tecnica Farmaceutica, Camerino, Italy. piera.dimartino@unicam.it
authors: Piera Di
authors: PD
authors: Martino
authors: Ledjan
authors: L
authors: Malaj
authors: Roberta
authors: R
authors: Censi
authors: Sante
authors: S
authors: Martelli
authors: Etienne
authors: E
authors: Joiris
authors: Christine
authors: C
authors: Barthélémy
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D008795:Metronidazole / Q000737:chemistry*; D011208:Powders; D013607:Tablets; D013678:Technology, Pharmaceutical; D013718:Tensile Strength
chemical_list: D011208:Powders; D013607:Tablets; D008795:Metronidazole; D002482:Cellulose; C008079:hydroxypropylcellulose