title: A model for drug release from fast phase inverting injectable solutions.
abstract: A model is developed to describe protein release kinetics from injectable, polymer solution depots which undergo rapid phase inversion on injection. The model consists of a polymer-rich phase and a solvent-rich phase, consistent with experimentally observed phase inversion morphology. Equations in the polymer-rich phase are based on diffusion-reaction mass balances for solvent, water and dissolved drug, and the rate of dissolution of dispersed drug particles. Equations in the water-rich phase are also of the diffusion-reaction type. Transport parameters in the polymer-rich phase are coupled to the ternary thermodynamics through friction formalism, and remaining parameters are estimated from literature data, leaving two free parameters: volume fraction of water-rich phase (epsilon) and k, the mass-transfer coefficient for bath-side transfer of the protein. Variations of these parameters lead to predictions of release profiles that vary from a rapid, burst-like behavior followed by a locking-in of the polymer-rich phase, to a uniform, zero-order profile. Comparisons are made to lysozyme release data for three systems: PLGA solutions in N-methlypyrollidinone (NMP), PLA solutions in NMP, and the latter with added Pluronic. Good agreement between model predictions and data is shown; in particular, the transition from rapid release to zero-order kinetics that occurs on addition of Pluronic is illustrated.
authors.affiliation: Department of Chemical and Biomolecular Engineering, University of Illinois, 600 S.Mathews, Urbana, IL 61801, USA.
authors.forename: C
authors.initials: C
authors.lastname: Raman
authors.forename: A J
authors.initials: AJ
authors.lastname: McHugh
mesh_terms: D016503:Drug Delivery Systems / Q000379:methods*; D008954:Models, Biological; D004364:Pharmaceutical Preparations / Q000008:administration & dosage / Q000378:metabolism*; D019999:Pharmaceutical Solutions / Q000008:administration & dosage / Q000493:pharmacokinetics
chemical_list: D004364:Pharmaceutical Preparations; D019999:Pharmaceutical Solutions