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"Ghost" silica nanoparticles of "host"-inherited antibacterial action

Halbus, Ahmed F.; Horozov, Tommy S.; Paunov, Vesselin N.

Authors

Ahmed F. Halbus

Vesselin N. Paunov



Contributors

Ahmed F. Halbus
Researcher

Vesselin N. Paunov
Supervisor

Abstract

Copyright © 2019 American Chemical Society. We fabricated surface-rough mesoporous silica nanoparticles ("ghost" SiO2NPs) by using composite mesoporous copper oxide nanoparticles ("host" CuONPs) as templates, which allowed us to mimic their surface morphology. The "host" CuONPs used here as templates, however, had a very high antibacterial effect, with or without functionalization. To evaluate the surface roughness effect on the "ghost" SiO2NPs antibacterial action, we functionalized them with (3-glycidyloxypropyl)trimethoxysilane (GLYMO) to permit additional covalent coupling of 4-hydroxyphenylboronic acid (4-HPBA). The diol groups on the bacterial membrane can form reversible covalent bonds with boronic acid (BA) groups on the "ghost" SiO2NPs surface and bind to the bacteria, resulting in a very strong amplification of their antibacterial activity, which does not depend on electrostatic adhesion. The BA-functionalized "ghost" SiO2NPs showed a very significant antibacterial effect as compared to smooth SiO2NPs of the same surface coating and particle size. We attribute this to the "ghost" SiO2NPs mesoporous surface morphology, which mimics to a certain extent those of the original mesoporous CuONPs used as templates for their preparation. We envisage that the "ghost" SiO2NPs effectively acquire some of the antibacterial properties from the "host" CuONPs, with the same functionality, despite being completely free of copper. The antibacterial effect of the functionalized "ghost" SiO2NPs/GLYMO/4-HPBA on Rhodococcus rhodochrous (R. rhodochrous) and Escherichia coli (E. coli) is much higher than that of the nonfunctionalized "ghost" SiO2NPs or the "ghost" SiO2NPs/GLYMO. The results indicate that the combination of rough surface morphology and strong adhesion of the particle surface to the bacteria can make even benign material such as silica act as a strong antimicrobial agent. Additionally, our BA-functionalized nanoparticles ("ghost" SiO2NPs/GLYMO/4-HPBA) showed no detectable cytotoxic impact against human keratinocytes at particle concentrations, which are effective against bacteria. ©

Citation

Halbus, A. F., Horozov, T. S., & Paunov, V. N. (2019). "Ghost" silica nanoparticles of "host"-inherited antibacterial action. ACS Applied Materials & Interfaces, 11(42), 38519−38530. https://doi.org/10.1021/acsami.9b14403

Journal Article Type Article
Acceptance Date Oct 1, 2019
Online Publication Date Oct 14, 2019
Publication Date Oct 14, 2019
Deposit Date Oct 28, 2019
Publicly Available Date Oct 15, 2020
Journal ACS Applied Materials & Interfaces
Print ISSN 1944-8244
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 11
Issue 42
Article Number acsami.9b14403
Pages 38519−38530
Item Discussed antimicrobial resistance, Gram positive bacteria, Gram negative bacteria, nanoparticles, antimicrobial nanotechnologies
DOI https://doi.org/10.1021/acsami.9b14403
Keywords Copper oxide nanoparticles; Silica nanoparticles; Mesoporous particles; Templating; Surface roughness; Antibacterial nanoparticles; Boronic acid; Bacteria
Public URL https://hull-repository.worktribe.com/output/2958056
Publisher URL https://pubs.acs.org/doi/10.1021/acsami.9b14403
Contract Date Oct 29, 2019

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©2019 University of Hull







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