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Impact of Bioinspired Nanotopography on the Antibacterial and Antibiofilm Efficacy of Chitosan

Tripathy, Abinash and Pahal, Suman and Mudakavi, Rajeev J and Raichur, Ashok M and Varma, Manoj M and Sen, Prosenjit (2018) Impact of Bioinspired Nanotopography on the Antibacterial and Antibiofilm Efficacy of Chitosan. In: BIOMACROMOLECULES, 19 (4). pp. 1340-1346.

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Official URL: http://dx.doi.org/ 10.1021/acs.biomac.8b00200

Abstract

Chitosan derived from chitin is one of the most abundant naturally occurring biocompatible polymers obtained from fungi and arthropods. In this work, we report the enhancement in the bactericidal efficacy of CHI in the presence of a sharp nanotopography. High-aspect ratio nanostructured surface (NSS) was fabricated using a single-step deep reactive ion etching technique (DRIE). Post fabrication, CHI coating was carried out using a layer-by-layer (LBL) dip coating process on the flat and nanostructured surfaces. Antibacterial efficacy of the flat silicon surface coated with CHI (Si_CHI) and NSS coated with CHI (NSS_CHI) was tested against both Gram-negative (G-ve) bacteria E. coli and Gram-positive (G+ve) bacteria S. aureus. NSS_CHI exhibited superior antibacterial property against G-ve and G+ve microbes as compared with Si_CHI and NSS substrates. Scanning electron microscopy (SEM) and fluorescence microscopy were used to study the morphology and viability of the bacteria on all the surfaces. Also, biofilm quantification was carried out on all the engineered surfaces for both E. coli and S. aureus using crystal violet (CV) staining. NSS_CHI was found to have the minimum biofilm formation on its surface exhibiting its superior antibacterial property. This study shows that the antibacterial and antibiofilm efficiency of CHI can be augmented by combining it with a sharp nanotopography.

Item Type: Journal Article
Additional Information: Copy right for this article belong to AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Division of Interdisciplinary Research > Centre for Nano Science and Engineering
Depositing User: Id for Latest eprints
Date Deposited: 04 May 2018 18:48
Last Modified: 04 May 2018 18:48
URI: http://eprints.iisc.ac.in/id/eprint/59744

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