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Issue 34, 2015
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The gold/ampicillin interface at the atomic scale

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Abstract

In the fight against antibiotic resistance, gold nanoparticles (AuNP) with antibiotics grafted on their surfaces have been found to be potent agents. Ampicillin-conjugated AuNPs have been thus reported to overcome highly ampicillin-resistant bacteria. However, the structure at the atomic scale of these hybrid systems remains misunderstood. In this paper, the structure of the interface between an ampicillin molecule AMP and three flat gold facets Au(111), Au(110) and Au(100) has been investigated with numerical simulations (dispersion-corrected DFT). Adsorption energies, bond distances and electron densities indicate that the adsorption of AMP on these facets goes through multiple partially covalent bonding. The stability of the AuNP/AMP nanoconjugates is explained by large adsorption energies and their potential antibacterial activity is discussed on the basis of the constrained spatial orientation of the grafted antibiotic.

Graphical abstract: The gold/ampicillin interface at the atomic scale

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Article information


Submitted
20 May 2015
Accepted
29 Jul 2015
First published
31 Jul 2015

Nanoscale, 2015,7, 14515-14524
Article type
Paper

The gold/ampicillin interface at the atomic scale

N. Tarrat, M. Benoit, M. Giraud, A. Ponchet and M. J. Casanove, Nanoscale, 2015, 7, 14515
DOI: 10.1039/C5NR03318G

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