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“This graphene system is able to detect the level of activity of an interfaced cell,” says Vikas Berry, associate professor and head of chemical engineering at UIC, who led the research along with Ankit Mehta, assistant professor of clinical neurosurgery in the UIC College of Medicine. “Graphene is the thinnest known material and is very sensitive to whatever happens on its surface,” Berry said. The nanomaterial is composed of a single layer of carbon atoms linked in a hexagonal chicken-wire pattern, and all the atoms share a cloud of electrons moving freely about the surface. “The cell’s interface with graphene rearranges the charge distribution in graphene, which modifies the energy of atomic vibration as detected by Raman spectroscopy,” Berry said, referring to a powerful workhorse technique that is routinely used to study graphene. The atomic vibration energy in graphene’s crystal lattice differs depending on whether it’s in contact with a cancer cell or a normal cell, Berry said, because the cancer cell’s hyperactivity leads to a higher negative charge on its surface and the release of more protons. “The electric field around the cell pushes away electrons in graphene’s electron cloud,” he said, which changes the vibration energy of the carbon atoms. The change in vibration energy can be pinpointed by Raman mapping with a resolution of 300 nanometers, he said, allowing characterization of the activity of a single cell. The study, reported in the journal ACS Applied Materials & Interfaces, looked at cultured human brain cells, comparing normal astrocytes to their cancerous counterpart, the highly malignant brain tumor glioblastoma multiforme. The technique is now being studied in a mouse model of cancer, with results that are “very promising,” Berry said. navigate to this web-siteExperiments with patient biopsies would be further down the road. “Once a patient has brain tumor surgery, we could use this technique to see if the tumor relapses,” Berry said.
For the original version including any supplementary images or video, visit https://www.sciencedaily.com/releases/2016/12/161219151748.htm
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