title: Diclofenac sodium sustained release hot melt extruded lipid matrices.
abstract: Sustained release diclofenac sodium (Df-Na) solid lipid matrices with Compritol® 888 ATO were developed in this study. The drug/lipid powders were processed via cold and hot melt extrusion at various drug loadings. The influence of the processing temperatures, drug loading and the addition of excipients on the obtained dissolution rates was investigated. The physicochemical characterization of the extruded batches showed the existence of crystalline drug in the extrudates with a small amount being solubilized in the lipid matrix. The drug content and uniformity on the tablet surface were also investigated by using energy dispersive X-ray microanalysis. The dissolution rates were found to depend on the actual Df-Na loading and the nature of the added excipients, while the effect of the processing temperatures was negligible. The dissolution mechanism of all extruded formulations followed Peppas-Korsemeyer law, based on the estimated determination coefficients and the dissolution constant rates, indicating drug diffusion from the lipid matrices.
authors.affiliation: University of Greenwich, School of Science , Chatham Maritime, Kent , UK .
authors.forename: K
authors.initials: K
authors.lastname: Vithani
authors.forename: Y
authors.initials: Y
authors.lastname: Cuppok
authors.forename: S
authors.initials: S
authors.lastname: Mostafa
authors.forename: I J
authors.initials: IJ
authors.lastname: Slipper
authors.forename: M J
authors.initials: MJ
authors.lastname: Snowden
authors.forename: D
authors.initials: D
authors.lastname: Douroumis
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage* / Q000737:chemistry; D003692:Delayed-Action Preparations / Q000737:chemistry*; D004008:Diclofenac / Q000008:administration & dosage* / Q000737:chemistry; D005227:Fatty Acids / Q000737:chemistry*; D006358:Hot Temperature; D012995:Solubility
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D003692:Delayed-Action Preparations; D005227:Fatty Acids; D004008:Diclofenac; C086409:glyceryl behenate