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Open AccessArticle

Effect of the Medium Composition on the Zn2+ Lixiviation and the Antifouling Properties of a Glass with a High ZnO Content

1
Institute of Materials Science of Madrid (ICMM-CSIC), Cantoblanco, 28049 Madrid, Spain
2
Nanomaterials and Nanotechnology Research Center (CINN), CSIC-University of Oviedo (UO), Avda de la Vega 4-6, El Entrego, 33940 San-Martín del Rey Aurelio, Spain
3
Microbiology Unit, Medicine Department, Universidad Complutense, Avda. Complutense s/n, 28040 Madrid, Spain
4
School of Chemistry-CRANN, Trinity College Dublin, Green College, Dublin 2, Ireland
5
Nanoker Research, Pol. Ind. Olloniego, Parcela 22A, Nave 5, 33660 Oviedo, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Enrico Bernardo
Materials 2017, 10(2), 167; https://doi.org/10.3390/ma10020167
Received: 23 December 2016 / Revised: 6 February 2017 / Accepted: 7 February 2017 / Published: 13 February 2017
(This article belongs to the Special Issue Bioceramics 2016)
The dissolution of an antimicrobial ZnO-glass in the form of powder and in the form of sintered pellets were studied in water, artificial seawater, biological complex media such as common bacterial/yeast growth media (Luria Bertani (LB), yeast extract, tryptone), and human serum. It has been established that the media containing amino acids and proteins produce a high lixiviation of Zn2+ from the glass due to the ability of zinc and zinc oxide to react with amino acids and proteins to form complex organic compounds. The process of Zn2+ lixiviation from the glass network has been studied by X-ray photoelectron spectroscopy (XPS). From these results we can state that the process of lixiviation of Zn2+ from the glass network is similar to the one observed in sodalime glasses, where Na+ is lixiviated to the media first and the fraction of Zn that acts as modifiers (~2/3) is lixiviated in second place. After the subsequent collapse of the outer surface glass layer (about 200–300 nm thick layer) the dissolution process starts again. Antifouling properties against different bacteria (S. epidermidis, S. aureus, P. aeruginosa, E. coli, and M. lutea) have also been established for the glass pellets. View Full-Text
Keywords: amino acids; Zn dispenser; biofilm; antimicrobial glass amino acids; Zn dispenser; biofilm; antimicrobial glass
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Esteban-Tejeda, L.; Palomares, F.J.; Cabal, B.; López-Píriz, R.; Fernández, A.; Sevillano, D.; Alou, L.; Torrecillas, R.; Moya, J.S. Effect of the Medium Composition on the Zn2+ Lixiviation and the Antifouling Properties of a Glass with a High ZnO Content. Materials 2017, 10, 167.

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