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      Formas farmacêuticas de liberação modificada: polímeros hidrifílicos Translated title: Modified release of drug delivery systems: hydrophilic polymers

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          Abstract

          Os sistemas de liberação de fármacos são parte integrante da investigação farmacêutica. A maioria dos sistemas de liberação oral de fármacos é baseada em matrizes poliméricas. Nas duas décadas passadas, as matrizes hidrofílicas tornaram-se muito populares na formulação de formas farmacêuticas de liberação modificada. A escolha do polímero hidrofílico na formulação da matriz pode fornecer uma combinação apropriada dos mecanismos de intumescimento, de dissolução ou de erosão e determinam a cinética de liberação in vitro. As matrizes de intumescimento são sistemas monolíticos preparados pela compressão de mistura de um polímero hidrofílico e de um fármaco. Elas representam sistemas da liberação em que os vários mecanismos podem ser adaptados ao programa de liberação. O sucesso desses sistemas está relacionado com a tecnologia de fabricação e com as características físicas e físico-químicas do polímero, responsáveis pelo mecanismo de liberação.

          Translated abstract

          Drug delivery systems (DDS) became an integral part of pharmaceutical research. The majority of oral DDS are matrix-based systems. Hydrophilic matrices for the past two decades have been popular in the formulation of controlled release solid dosage forms. Swellable matrices are monolithic systems prepared by compression of a powdered mixture of a hydrophilic polymer and a drug. They represent a delivery system in which various mechanisms can be adapted to the delivery program. Their success is linked to the established tabletting technology of manufacture. The choice of the hydrophilic polymer in the matrix formulation can provide an appropriate combination of swelling, dissolution or erosion mechanisms to evaluate in vitro release kinetics.

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          Molecular Analysis of Drug Delivery Systems Controlled by Dissolution of the Polymer Carrier

          Dissolution-controlled drug delivery systems are characterized by a phase erosion of the polymer carrier that is associated with fast or slow dissolution of the macromolecular chains. The molecular nature of the dissolution phenomenon was examined by analyzing the water transport process and the subsequent polymer chain disentanglement that is usually characterized by a snake-like motion of the chain (reptation). The results indicate that the polymer molecular weight, water, polymer and drug diffusion coefficients, equilibrium water concentration in the polymer, and water-polymer interaction parameter can control the mechanism and rate of drug release. A new model for this process was developed, and its predictions are compared with experimental studies of drug delivery from poly(vinyl alcohol)-based systems.
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            The influence of polymeric excipients on drug release from hydroxypropylmethylcellulose matrices

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              Handbook of Pharmaceutical Controlled Release Technology.

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                rbcf
                Revista Brasileira de Ciências Farmacêuticas
                Rev. Bras. Cienc. Farm.
                Divisão de Biblioteca e Documentação do Conjunto das Químicas da Universidade de São Paulo (São Paulo )
                1516-9332
                June 2005
                : 41
                : 2
                : 143-154
                Affiliations
                [1 ] Universidade do Porto Portugal
                Article
                S1516-93322005000200003
                10.1590/S1516-93322005000200003
                9bc50f7e-09f1-489a-a2b0-5db7c4ae1ce0

                http://creativecommons.org/licenses/by/4.0/

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                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-9332&lng=en
                Categories
                PHARMACOLOGY & PHARMACY

                Pharmacology & Pharmaceutical medicine
                Controlled release,Matrix polymers,Hydrophilic matrices,Liberação modificada,Polímeros matriciais,Matrizes hidrofílicas

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