Novel antibacterial bioactive glass nanocomposite functionalized with tetracycline hydrochloride

Josefina Rivadeneira 1 , Gisela M. Luz 2 , M. Carina Audisio 3 , João F. Mano 2 ,  and Alejandro A. Gorustovich 1
  • 1 Grupo Interdisciplinario en Materiales-Universidad Católica de Salta (IESIINGUCASAL), Instituto de Tecnologías y Ciencias de Ingeniería- Universidad Buenos Aires-Consejo Nacional de Investigaciones Científicas y Técnicas (INTECIN UBA-CONICET), Campo Castañares s/n, Salta, Argentina
  • 2 3B’s Research Group-Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, P-4806-909 Taipas, Guimarães, Portugal; ICVS/3B’s Associate Laboratory, Braga/Guimarães, Portugal
  • 3 Instituto de Investigaciones para la Industria Química - Consejo Nacional de Investigaciones Científicas y Técnicas (INIQUI - CONICET), Universidad Nacional de Salta (UNSa), Av. Bolivia 5150, Salta, Argentina

Abstract

To prevent the high frequency of wound infections, anti-bacterial agents can be loaded onto composites. In the present study, the antibiotic tetracycline hydrochloride (TC)was incorporated, for the first time, in collagen type I membranes coated with nano-sized SiO2-CaOP2O5 bioactive glass (n-BG) obtained by a sol-gel chemical route.

Collagen membranes coated with n-BG were immersed in simulated body fluid (SBF) containing 0.25, 0.75 or 1.25 mg mL−1 of TC for 48 h at 37∘C following a coprecipitation method. The antibiotic was released in distilledwater at 37∘C for up to 72 h. The antibacterial activity of the composites was evaluated in vitro by the inhibition zone test and plate count method. Two different Staphylococcus aureus strains, S. aureus ATCC29213 and S. aureus ATCC25923, were exposed to the biomaterials. The results showed that the incorporation but not the release of TC was dependent on the initial concentration of TC in SBF. The biomaterials inhibited S. aureus growth, although the efficacy was similar for all the concentrations. The results allow us to conclude that the new composite could have potential in the prevention of wound infections.

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Biomedical Glasses is an international open access journal covering the field of glasses for biomedical applications. The aim of the journal is to provide a peer-reviewed forum for the publication of original research reports and authoritative review articles related to the development of biomedical glasses and their use in clinical applications.

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