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Main Title: Drug Delivery From Polymer-Based Nanopharmaceuticals—An Experimental Study Complemented by Simulations of Selected Diffusion Processes
Author(s): Macha, Innocent J.
Ben-Nissan, Besim
Vilchevskaya, Elena N.
Morozova, Anna S.
Abali, Bilen Emek
Müller, Wolfgang H.
Rickert, Wilhelm
Type: Article
Language Code: en
Abstract: The success of medical therapy depends on the correct amount and the appropriate delivery of the required drugs for treatment. By using biodegradable polymers a drug delivery over a time span of weeks or even months is made possible. This opens up a variety of strategies for better medication. The drug is embedded in a biodegradable polymer (the “carrier”) and injected in a particular position of the human body. As a consequence of the interplay between the diffusion process and the degrading polymer the drug is released in a controlled manner. In this work we study the controlled release of medication experimentally by measuring the delivered amount of drug within a cylindrical shell over a long time interval into the body fluid. Moreover, a simple continuum model of the Fickean type is initially proposed and solved in closed-form. It is used for simulating some of the observed release processes for this type of carrier and takes the geometry of the drug container explicitly into account. By comparing the measurement data and the model predictions diffusion coefficients are obtained. It turns out that within this simple model the coefficients change over time. This contradicts the idea that diffusion coefficients are constants independent of the considered geometry. The model is therefore extended by taking an additional absorption term into account leading to a concentration dependent diffusion coefficient. This could now be used for further predictions of drug release in carriers of different shape. For a better understanding of the complex diffusion and degradation phenomena the underlying physics is discussed in detail and even more sophisticated models involving different degradation and mass transport phenomena are proposed for future work and study.
Issue Date: 8-Mar-2019
Date Available: 11-Apr-2019
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
570 Biowissenschaften; Biologie
Subject(s): gentamicin
polylacetic acid
diffusion coefficient
Sponsor/Funder: DFG, 414044773, Open Access Publizieren 2019 - 2020 / Technische Universität Berlin
Journal Title: Frontiers in Bioengineering and Biotechnology
Publisher: Frontiers Media
Publisher Place: Lausanne
Volume: 7
Article Number: 37
Publisher DOI: 10.3389/fbioe.2019.00037
EISSN: 2296-4185
Appears in Collections:FG Kontinuumsmechanik und Materialtheorie » Publications

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