title: Microspheres from new biodegradable poly(ester amide)s with different ratios of L- and D-alanine for controlled drug delivery.
abstract: A series of biodegradable poly (ester amide)s composed of sebacic acid, dodecanediol and different ratios of the stereoisomers of L- and D-alanine were synthesized for applications in drug delivery systems. Microspheres loaded with diclofenac sodium salt, triclosan and clofazimine were prepared with the solvent evaporation technique. No influence of polymer constitution in the drug release rate was found in vitro and no degradation occurred during the period of drug release. It was shown that a sustained delivery of the hydrophilic diclofenac sodium salt in Sörensen media occurred and it was controlled by diffusion. However, exhaustion of microspheres was feasible only from the most porous matrices where channelling had an important contribution.
authors.affiliation: Departament d'Enginyeria Química, Universitat Politècnica de Catalunya, Barcelona, Spain. montserrat.vera@upc.edu
authors.forename: M
authors.initials: M
authors.lastname: Vera
authors.forename: J
authors.initials: J
authors.lastname: Puiggalí
authors.forename: J
authors.initials: J
authors.lastname: Coudane
mesh_terms: D000409:Alanine / Q000737:chemistry*; D000577:Amides / Q000138:chemical synthesis / Q000737:chemistry*; D001673:Biodegradation, Environmental; D002152:Calorimetry, Differential Scanning; D003692:Delayed-Action Preparations / Q000737:chemistry / Q000493:pharmacokinetics; D016503:Drug Delivery Systems; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D015394:Molecular Structure; D008970:Molecular Weight; D010316:Particle Size; D011091:Polyesters / Q000138:chemical synthesis / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013237:Stereoisomerism
chemical_list: D000577:Amides; D003692:Delayed-Action Preparations; D011091:Polyesters; D000409:Alanine