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Bacterial response to graphene oxide and reduced graphene oxide integrated in agar plates.

Research paper by V R S S VRSS Mokkapati, Santosh S Pandit, Jinho J Kim, Anders A Martensson, Martin M Lovmar, Fredrik F Westerlund, Ivan I Mijakovic

Indexed on: 20 Dec '18Published on: 20 Dec '18Published in: Royal Society open science



Abstract

There are contradictory reports in the literature regarding the anti-bacterial activity of graphene, graphene oxide (GO) and reduced graphene oxide (rGO). This controversy is mostly due to variations in key parameters of the reported experiments, like: type of substrate, form of graphene, number of layers, type of solvent and most importantly, type of bacteria. Here, we present experimental data related to bacterial response to GO and rGO integrated in solid agar-based nutrient plates-a standard set-up for bacterial growth that is widely used by microbiologists. and strains were used for testing bacterial growth. We observed that plate-integrated rGO showed strong anti-bacterial activity against both bacterial species. By contrast, plate-integrated GO was harmless to both bacteria. These results reinforce the notion that the response of bacteria depends critically on the type of graphene material used and can vary dramatically from one bacterial strain to another, depending on bacterial physiology.