Chalmers team fights bacterial infections using vertical graphene films

A research team at Chalmers University has shown that a layer of vertical graphene flakes forms a protective surface that makes it impossible for bacteria to attach. Instead, bacteria are sliced apart by the sharp graphene flakes and killed. Coating implants with a layer of graphene flakes can therefore help protect patients against infection, eliminate the need for antibiotic treatment, and reduce the risk of implant rejection. The osseointegration - the process by which the bone structure grow to attach the implant - is not disturbed. In fact, the graphene has been shown to benefit the bone cells.

Chalmers University researchers stated that the biological applications of graphene began to materialize a few years ago. The researchers saw conflicting results in earlier studies, in which some showed that graphene damaged the bacteria, others that they were not affected. "We discovered that the key parameter is to orient the graphene vertically. If it is horizontal, the bacteria are not harmed" says Ivan Mijakovic, Professor at the Department of Biology and Biological Engineering.

Indian team develops a GO-enhanced smart bandage

Researchers from the Institute of Advanced Study in Science and Technology (IASST) in India have developed a smart bandage material based on graphene oxide that can heal wounds better and faster and has antimicrobial properties.

IASST team develops GO-based smart bandage image

The bandage is made of cotton patch coated with chitosan-based hydogel that is loaded with curcumin and graphene oxide. The researchers used curcumin as a model drug but said it can be replaced with other antimicrobials.

Archer and Adelaide University to develop graphene-based biosensors

Graphite company Archer Exploration has redefined its existing relationship with the University of Adelaide, by shifting developmental focus away from industrial graphite applications to more consumer-focused graphene-based products.

The collaboration will aim to develop and implement graphene and carbon-based materials for use in complex biosensing which can target applications in human health. Research will explore graphene-based materials for complex biosensing to generate patents with commercial applications and will combine AXE's graphite and graphene materials with the research and development capability of the university.

New graphene-enhanced biomaterial may be capable of regenerating tissue

Researchers at the Science Foundation Ireland-funded AMBER Materials Science Center have developed a new graphene-infused collagen-based biomaterial which they say may in time be capable of regenerating heart, nerve, spinal cord, brain and other tissue that responds to an electrical stimulus. The material also has the added bonus of being able to fight infection.

The scientists said they found that by adding graphene, they could make the collagen electro-conductive. The resulting substance has regenerative potential that can carry electrical signals over patches of damaged tissue, restoring function once again to the impacted area.

Graphene inks enable low-cost printed cell-sensors

Fraunhofer scientists have developed biosensors with graphene electrodes, produced cheaply and simply by roll-to-roll printing. A system prototype for mass production has already been established. This may change the current situation in which cell-based biosensors can be quite expensive to make, which often prevents them from being used. Cost factors for sensors that perform measurements electrically are the expensive electrode material and complex production.

Fraunhofer develops low-cost process for printed graphene sensors image

Cell-based biosensors measure changes in cell cultures via electrical signals. This is done using electrodes which are mounted inside the Petri dish or the wells of a 'well plate'. If added viruses destroy a continuous cell layer on the electrodes, for example, the electrical resistance measured between the electrodes is reduced. In this way, the effect of vaccines or drugs (for example) can be tested: the more effective the active ingredient is, the smaller the number of cells that are destroyed by the viruses and the lower the measured resistance change will be. Also toxicity tests, such as on cosmetic products, can function according to the same principle and may replace animal experiments in the future. Another advantage is that if biosensors are linked to an evaluation unit, measurements can be continuous and automated.

Versarien - Think you know graphene? Think again!Versarien - Think you know graphene? Think again!