title: The effect of poloxamer viscosity on liquid-filling of solid dispersions in hard gelatin capsules.
abstract: Preliminary studies were undertaken on poloxamers to investigate their suitability for liquid-fill formulations for hard gelatin capsules. Poloxamers with viscosity in the range (0.32-2.8 Pa s) and melting point 48-58 degrees C were used as the continuous phase, with alpha-lactose monohydrate of negligible solubility in the molten poloxamers, as a model insoluble disperse phase. Physicochemical characterization by rheology, melt solidification and moisture uptake indicated that poloxamers were suitable excipients for liquid-filling in hard gelatin capsules. 10% w/w lactose/poloxamer dispersions were thixotropic and shear thinning and exhibited good capsule-filling properties, disperse-phase uniformity and satisfactory apparent viscosity at 70 degrees C.
authors.affiliation: The Institute of Pharmacy and Chemistry, University of Sunderland, SR2 3SD, Sunderland, UK. A.Kattige@yahoo.co.uk
authors.forename: A
authors.initials: A
authors.lastname: Kattige
authors.forename: G
authors.initials: G
authors.lastname: Rowley
mesh_terms: D002214:Capsules; D004355:Drug Stability; D005079:Excipients; D005780:Gelatin; D010316:Particle Size; D020442:Poloxamer / Q000737:chemistry*; D013678:Technology, Pharmaceutical; D014783:Viscosity; D014867:Water / Q000032:analysis
chemical_list: D002214:Capsules; D005079:Excipients; D014867:Water; D020442:Poloxamer; D005780:Gelatin