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Open AccessArticle

Lysine-Grafted MCM-41 Silica as an Antibacterial Biomaterial

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Departamento de Madera, Celulosa y Papel, Universidad de Guadalajara, Guadalajara 44100, Mexico
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CONACYT Research Fellow at Departamento de Madera, Celulosa y Papel, Universidad de Guadalajara, Guadalajara 44100, Mexico
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Laboratorio de Microbiología e Inocuidad de Alimentos, Universidad de Guadalajara, Guadalajara 44100, Mexico
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Departamento de Química Inorgánica y Bioinorgánica, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain
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CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28040 Madrid, Spain
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Authors to whom correspondence should be addressed.
Academic Editor: Gary Chinga Carrasco
Bioengineering 2017, 4(4), 80; https://doi.org/10.3390/bioengineering4040080
Received: 23 August 2017 / Revised: 20 September 2017 / Accepted: 21 September 2017 / Published: 26 September 2017
(This article belongs to the Special Issue Novel Biocomposite Engineering and Bio-Applications)
This paper proposes a facile strategy for the zwitterionization of bioceramics that is based on the direct incorporation of l-lysine amino acid via the ε-amino group onto mesoporous MCM-41 materials. Fourier transform infrared (FTIR) studies of lysine-grafted MCM-41 (MCM-LYS) simultaneously showed bands at 3080 and 1540 cm−1 and bands at 1625 and 1415 cm−1 corresponding to -NH3+/COO pairs, which demonstrate the incorporation of the amino acid on the material surface keeping its zwitterionic character. Both elemental and thermogravimetric analyses showed that the amount of grafted lysine was 8 wt. % based on the bioceramic total weight. Moreover, MCM-LYS exhibited a reduction of adhesion of S. aureus and E. coli bacteria in 33% and 50%, respectively at physiological pH, as compared with pristine MCM-41. Biofilm studies onto surfaces showed that lysine functionalization elicited a reduction of the area covered by S. aureus biofilm from 42% to only 5% (88%). This research shows a simple and effective approach to chemically modify bioceramics using single amino acids that provides zwitterionic functionality, which is useful to develop new biomaterials that are able to resist bacterial adhesion. View Full-Text
Keywords: lysine grafting; zwitterionization; mesoporous MCM-41 biomaterial; antibacterial adhesion; biofilm formation lysine grafting; zwitterionization; mesoporous MCM-41 biomaterial; antibacterial adhesion; biofilm formation
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MDPI and ACS Style

Villegas, M.F.; Garcia-Uriostegui, L.; Rodríguez, O.; Izquierdo-Barba, I.; Salinas, A.J.; Toriz, G.; Vallet-Regí, M.; Delgado, E. Lysine-Grafted MCM-41 Silica as an Antibacterial Biomaterial. Bioengineering 2017, 4, 80.

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