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July 22 2019

Smart tattoo indicates glucose levels by changing color

Gianluca Ricciodi Gianluca Riccio
in Medicine, Technology
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Smart tattoo indicates glucose levels by changing color

With this intelligent tattoo, the team has created a transformative technology based on a decoration practice practiced from the mists of time.

This is not a wearable device that requires charging, but a real, normal intelligent intradermal tattoo. Just like the ones we will see by the millions on beaches around the world.

A German research team developed a method for obtaining an intelligent tattoo without any use of electronics. A tattoo that can change color as a response to changes in the body's glucose, albumin or PH levels.

Smart tattoo

Real-time analysis and monitoring

The project is being tested on animals (pigs, to be precise). On their skin these special designs showed the variations of these biomarkers with legible gradations.

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After mini dialysis this is another exciting step in the direction of real tattoos that without any energy consumption allow patients and doctors to monitor chronic ailments such as diabetes or those affecting the kidneys at a glance.

The team led by the chemical engineer Ali Yetisen of the Technical University of Munich was able to create a real transformative technology. A modern method based on a decoration practice that humans have practiced since the dawn of time.

"Changing the appearance of the body by injecting pigments into the dermis layer is a practice that is more than 4000 years old," writes the researcher in his paper. “We have developed cosmetic technology to combine artistic tattoos and colorimetric biosensors. The result is that the smart tattoo works as a diagnostic display by changing color in response to changes in the body. "

The choice fell on these three biomarkers (glucose, albumin, ph) because often their variation indicates that something is quickly going wrong in our body.

albumin it is a protein in plasma whose level is low when there are kidney or liver problems, and it is high when there are heart problems. The glucose needs to be continuously monitored by patients with diabetes, because they have problems with the body's ability to metabolize sugars. The variations of PHon the other hand (acidosis when low, alkalosis when high) are a general indicator. They indicate a wide range of problems that need further analysis.

Smart tattoo
The range of colors that indicate biomarker levels

The team created several tints that can detect these changes in the interstitial fluid, which also transports oxygen and glucose between cells and is found just about everywhere in our body. The albumin sensor has a yellow color and turns green as the levels increase. The glucose sensor exploits the enzymatic reactions of oxidase and peroxidase: the change in its values ​​determines the transition from yellow to dark green. For the PH there is a range that goes from yellow to blue when the levels are in the range between 5 and 9 (the 'normal' human one is around 7,4).

Reading this study I learned something new for me: the pig skin was not only used by the German team for testing, but it is also the "exercise book" for tattoo artists.

The next steps

Human tests will be needed to confirm and improve characteristics and performance. To say the least, currently two of these three shades are not reversible. In other words, in two out of three cases once the color has changed, it does not go back, only the one on the PH is already perfected. In the next tests, synthetic receptors will be added to the two hues still to be perfected. In the immediate term, however, tests will continue on live animals to evaluate any adverse reactions.

For when human tests are done, which will plausibly take at least two more years, this smart tattoo will monitor so much more. Thing? For example also the levels of electrolytes, proteins, pathogenic microorganisms, gas and hydration.

Until the day when looking at the forearm we will know that there is a cold. Either that we are entering the sugar reserve, or that maybe we have to drink more.

The research was published in the international edition of the journal Angewandte Chemie

tags: biomarkersdiagnosestattooelectronic tattooSmart tattoo
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Gianluca Riccio, copywriter and journalist - Born in 1975, he is the creative director of an advertising agency, he is affiliated with the Italian Institute for the Future, World Future Society and H +, Network of Italian Transhumanists.

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