Table of Contents
ISRN Pharmaceutics
Volume 2013 (2013), Article ID 104529, 8 pages
http://dx.doi.org/10.1155/2013/104529
Research Article

Suitability of Biomorphic Silicon Carbide Ceramics as Drug Delivery Systems against Bacterial Biofilms

1Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
2Departamento de Microbiología, Facultad de Medicina, Universidad de Santiago de Compostela, 15705 Santiago de Compostela, Spain
3Departamento de Física Aplicada, E.E. Industriais, Universidade de Vigo, 36301 Vigo, Spain

Received 10 May 2013; Accepted 12 June 2013

Academic Editors: F.-R. Chang, F. Fullas, D. Kuzmich, C. Saturnino, and V. Tantishaiyakul

Copyright © 2013 P. Díaz-Rodríguez et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The present work is aimed at getting a new insight into biomorphic silicon carbides (bioSiCs) as bone replacement materials. BioSiCs from a variety of precursors were produced, characterized, and loaded with a broad-spectrum antibiotic. The capacity of loaded bioSiCs for preventing and/or treating preformed S. aureus biofilms has been studied. The differences in precursor characteristics are maintained after the ceramic production process. All bioSiCs allow the loading process by capillarity, giving loaded materials with drug release profiles dependent on their microstructure. The amount of antibiotic released in liquid medium during the first six hours depends on bioSiC porosity, but it could exceed the minimum inhibitory concentration of Staphylococcus aureus, for all the materials studied, thus preventing the proliferation of bacteria. Differences in the external surface and the number and size of open external pores of bioSiCs contribute towards the variations in the effect against bacteria when experiments are carried out using solid media. The internal structure and surface properties of all the systems seem to facilitate the therapeutic activity of the antibiotic on the preformed biofilms, reducing the number of viable bacteria present in the biofilm compared to controls.