title: Subcutaneous polymeric matrix system p(HEMA-BGA) for controlled release of an anticancer drug (5-fluorouracil). II: Release kinetics.
abstract: A subcutaneous polymeric drug delivery system, which consists of a polymeric matrix of poly(hydroxyethyl methacrylate-bisglycol acrylate), was developed. 5-fluorouracil was used as the model anticancer drug. Polymer-drug beads with a diameter of 3 mm were prepared by low-temperature radiation polymerization. In order to modify the release rate, polymeric beads with different composition, drug loading and crosslinking density were obtained. The kinetics of drug release were described by the expression Mt/M infinity = ktn. The diffusional release exponent 'n', which was calculated from the release curves, indicated that the mechanism of drug release from the polymeric matrix is due to the anomalous (non-Fickian) type of diffusion.
authors.affiliation: Hacettepe University, Chemical Engineering Department, Ankara, Turkey.
authors.forename: A
authors.initials: A
authors.lastname: Denizli
authors.forename: M
authors.initials: M
authors.lastname: Kiremitçi
authors.forename: E
authors.initials: E
authors.lastname: Pişkin
mesh_terms: D000179:Acrylates / Q000138:chemical synthesis; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D005472:Fluorouracil / Q000008:administration & dosage*; D007202:Indicators and Reagents; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D011102:Polyhydroxyethyl Methacrylate / Q000031:analogs & derivatives / Q000138:chemical synthesis; D011109:Polymethacrylic Acids / Q000031:analogs & derivatives / Q000138:chemical synthesis
chemical_list: D000179:Acrylates; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D007202:Indicators and Reagents; D011109:Polymethacrylic Acids; D011102:Polyhydroxyethyl Methacrylate; C056970:poly(hydroxyethylmethacrylate bisglycolacrylate); D005472:Fluorouracil