title: Deformation properties of pharmaceutical excipients determined using an in-die and out-die method.
abstract: This study investigated deformation mechanisms of some commonly used pharmaceutical fillers, such as microcrystalline cellulose, lactose, dicalcium phosphate, isomalt and cornstarch, using a combination of the in-die and out-die method with the Heckel and Walker models. The tableting mixtures contained of 98.5% (w/w) filler, the rest consisted of dry binder and an antiadhesive agent. Our results showed that plasticity and elasticity may be considered independent deformation properties as highly plastic materials (microcrystalline cellulose, cornstarch) also exhibited high elasticity. Particular emphasis was placed on explaining the differences observed between the in-die and out-die method-comparison revealed that the differences are a consequence of the material's elastic properties. Larger error of in-die results can be expected for more elastic materials, and thus in-die Heckel should be used with some considerations. In contrast, the Walker model was found to be more robust and smaller differences were observed between the two methods. We consider the most correct results to have been obtained by the out-die approach, which excludes the elastic properties of the material evaluated. An excellent correlation between elastic determination at the single-particle level and multiple-particle scale was demonstrated, suggesting a great potential of nanoscale determination of a material's mechanical properties for better elucidation of deformation mechanisms.
authors: Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Ljubljana, Aškerčeva 7, Ljubljana, Slovenia. ilija.ilic@ffa.uni-lj.si
authors: Ilija
authors: I
authors: Ilić
authors: Biljana
authors: B
authors: Govedarica
authors: Rok
authors: R
authors: Šibanc
authors: Rok
authors: R
authors: Dreu
authors: Stane
authors: S
authors: Srčič
mesh_terms: D002130:Calcium Phosphates / Q000737:chemistry; D002482:Cellulose / Q000737:chemistry; D004187:Disaccharides / Q000737:chemistry; D004339:Drug Compounding; D004548:Elasticity; D005079:Excipients / Q000737:chemistry*; D007785:Lactose / Q000737:chemistry; D008962:Models, Theoretical; D012965:Sodium Chloride / Q000737:chemistry; D013213:Starch / Q000737:chemistry; D013402:Sugar Alcohols / Q000737:chemistry; D013678:Technology, Pharmaceutical / Q000379:methods*
chemical_list: D002130:Calcium Phosphates; D004187:Disaccharides; D005079:Excipients; D013402:Sugar Alcohols; D012965:Sodium Chloride; C016640:Palatinit; D002482:Cellulose; D013213:Starch; D007785:Lactose; C485829:calcium phosphate, dibasic, anhydrous; C109691:microcrystalline cellulose