Gold Nanoparticle “Tattoos” Solve Diagnostic Issues

The new sensor uses color-stable gold nanoparticles that are modified with receptors for specific molecules. The nanogold is embedded in an artificial polymeric tissue and implanted under the skin. It then reports drug concentration changes by shifting color. Because they’re embedded in a porous hydrogel with a tissue-like consistency, they act like invisible tattoos that aren't rejected by the body. The gold nanoparticles aren’t visible with the naked eye, but can be viewed non-invasively through the skin with a special device.