title: Swellable drug-polyelectrolyte matrices of drug-carboxymethylcellulose complexes. Characterization and delivery properties.
abstract: This article reports the development and delivery properties of swellable drug-polyelectrolyte matrices prepared with complexes of the acid form of carboxymethylcellulose (HCMC). Drug-polyelelectrolyte complexes (HCMC-D) were obtained by neutralization of HCMC with two model basic drugs (atenolol and metoclopramide). Characterization through FT-infrared spectroscopy, power X-ray diffraction, and DSC indicates the ionic nature of the interaction between the carboxylic groups of HCMC and the basic group of D. Matrices prepared by compacting (HCMC-D) alone or in a mixture with sodium carboxymethylcellulose were subjected to measurements of solvent up-take, dynamics of swelling, and release kinetics. Delivery rate of mixed matrices is a function of its composition and may be widely modulated. They exhibited anomalous delivery kinetics with Korsmeyer exponent n in the range 0.67-0.87. Experimental results indicate that the erosion of the hydrogel layer is the main delivery process.
authors.affiliation: Departamento de Farmacia, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, Argentina.
authors.forename: María V Ramírez
authors.initials: MV
authors.lastname: Rigo
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Allemandi
authors.forename: Ruben H
authors.initials: RH
authors.lastname: Manzo
mesh_terms: D001262:Atenolol / Q000008:administration & dosage / Q000737:chemistry / Q000493:pharmacokinetics; D001682:Biological Availability; D002021:Buffers; D002152:Calorimetry, Differential Scanning; D002266:Carboxymethylcellulose Sodium / Q000031:analogs & derivatives / Q000737:chemistry*; D016503:Drug Delivery Systems / Q000379:methods*; D008787:Metoclopramide / Q000008:administration & dosage / Q000737:chemistry / Q000493:pharmacokinetics; D004364:Pharmaceutical Preparations / Q000008:administration & dosage / Q000737:chemistry*; D012212:Rheology; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D002021:Buffers; D004364:Pharmaceutical Preparations; D014867:Water; D001262:Atenolol; D002266:Carboxymethylcellulose Sodium; D008787:Metoclopramide