Nanocrystals With Unique Surface Texture That Eradicates Bacteria Biofilm

Removal of Bacterial Biofilm via Mtex

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Schematic diagram revealing elimination of bacterial biofilm through Mtex. Credit: POSTECH

The COVID-19 pandemic is raising worries of brand-new pathogens such as brand-new infections or drug-resistant germs. To this, a Korean research study group has actually just recently drawn attention for establishing the innovation for eliminating antibiotic-resistant germs by managing the surface area texture of nanomaterials.

A joint research study group from POSTECH and UNIST has actually presented mixed-FeCo-oxide-based surface-textured nanostructures (MTex) as extremely effective magneto-catalytic platform in the global journal Nano Letters. The group included teachers In Su Lee and Amit Kumar with Dr. Nitee Kumari of POSTECH’s Department of Chemistry and Professor Yoon-Kyung Cho and Dr. Sumit Kumar of UNIST’s Department of Biomedical Engineering.

First, the scientists manufactured smooth surface area nanocrystals in which different metal ions were covered in a natural polymer shell and warmed them at a really heat. While annealing the polymer shell, a high-temperature solid-state chain reaction caused blending of other metal ions on the nanocrystal surface area, producing a variety of few-nm-sized branches and holes on it. This distinct surface area texture was discovered to catalyze a chain reaction that produced reactive oxygen types (ROS) that eliminates the germs. It was likewise verified to be extremely magnetic and quickly drew in towards the external electromagnetic field. The group had actually found an artificial technique for transforming regular nanocrystals without surface area functions into extremely practical mixed-metal-oxide nanocrystals.

Transmission Electron Microscope Image of Mtex

Transmission electron microscopic lense (TEM) picture of Mtex. Credit: POSTECH

The research study group called this surface area topography – with branches and holes that looks like that of a ploughed field – “MTex.” This distinct surface area texture has actually been confirmed to increase the movement of nanoparticles to enable effective penetration into biofilm[1] matrix while revealing high activity in producing reactive oxygen types (ROS) that are deadly to germs.
This system produces ROS over a broad pH variety and can successfully diffuse into the biofilm and eliminate the ingrained germs resistant to prescription antibiotics. And because the nanostructures are magnetic, biofilm particles can be scraped out even from the hard-to-reach microchannels.

“This freshly established MTex programs high catalytic activity, unique from the steady smooth-surface of the standard spinel [2] kinds,” discussed Dr. Amit Kumar, among the matching authors of the paper. “This characteristic is very useful in infiltrating biofilms even in small spaces and is effective in killing the bacteria and removing biofilms.”

“This research allows to regulate the surface nanotexturization, which opens up possibilities to augment and control the exposure of active sites,” said Professor In Su Lee who led the research study. “We anticipate the nanoscale-textured surfaces to contribute significantly in developing a broad array of new enzyme-like properties at the nano-bio interface.”


  1. Biofilm
    The condition in which microbes coalesce into a mass to form a movie on a strong or biological surface area.
  2. Spinel
    Isometric octahedral crystal type of oxidized aluminum or magnesium. Usually colorless or has a shade of red, blue, green, yellow, brown, or black. Pure kinds are utilized as gems.

Reference: “Surface-Textured Mixed-Metal-Oxide Nanocrystals as Efficient Catalysts for ROS Production and Biofilm Eradication” by Nitee Kumari, Sumit Kumar, Mamata Karmacharya, Sateesh Dubbu, Taewan Kwon, Varsha Singh, Keun Hwa Chae, Amit Kumar, Yoon-Kyoung Cho and In Su Lee, 11 December 2020, Nano Letters.
DOI: 10.1021/acs.nanolett.0c03639

This research study was carried out with the assistance from the Leader Researcher Program (Creative Research) of the National Research Foundation and the Institute for Basic Science of Korea.

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