A silk film holding a chromophore and implanted under the skin will glow under UV light to reveal levels of oxygen in the blood.
People get tattoos to remember an event or a person, to make a statement, or simply as an aesthetic embellishment. But imagine a tattoo that could be functional—telling you how much oxygen you are using when exercising, measuring your blood glucose level at any time of day, or monitoring a number of different blood components or exposure to environmental toxins.
Now engineers at Tufts University have taken an important step toward making that happen with the invention of a silk-based material placed under the skin that glows brighter or dimmer under a lamp when exposed to different levels of oxygen in the blood. They reported their findings in Advanced Functional Materials.
The novel sensor, which currently is limited to reading oxygen levels, is made up of a gel formed from the protein components of silk, called fibroin. The silk fibroin proteins have unique properties that make them especially compatible as an implantable material.
When they are re-assembled into a gel or film, they can be adjusted to create a structure that lasts under the skin from a few weeks to over a year. When the silk does break down, it is compatible with the body and unlikely to invoke an immune response.Continue reading… “Scientists create tattoo-like sensors that reveal blood oxygen levels”