Dip Chip Biosensor Detects Toxicity

Biosensor warns of toxicity in real time.
The new technology relies on the use of modified microorganisms, detected in particular for quickly and accurately, one biological reaction against toxic chemicals.

From man-made toxic chemicals such as industrial by-products to poisons that occur naturally, a water or food supply can be easily contaminated. And for every level of toxic material ingested, there is some level of bodily response, ranging from minor illness to painful certain death.

Researchers  of Tel Aviv University's Faculty of Engineering and  the Institute of Life Sciences at the Hebrew University of Jerusalem, has married biology and engineering to produce a biosensor device called the "Dip Chip," which detects toxicity quickly and accurately, generating low false positive and false negative readings. The Dip Chip contains microbes designed to exhibit a biological reaction to toxic chemicals, emulating the biological responses of humans or animals.

Converting biological response to electricity

The biological reaction is converted into an electronic signal that can be read by the user. When perfected for commercial applications, the chip might be easily plugged into a mobile device to determine toxicity.

The new chips are based on genetically modified microbes, when  are exposed to toxic or poisonous materials, they produce a measurable biochemical reaction.

The device, which looks like a dip stick, immobilizes these specially-produced microbes next to the sensing electrodes. Once the microbes come into contact with a questionable substance they produce a chemical signal that is converted to an electrical current by an device that can interpret the signals, producing a binary "toxic" or "not toxic" diagnosis.

In the future, they hopes that smaller versions of the Dip Chips might be plugged into existing mobile electronic devices, such as cell phones or tablets, to give the user a toxicity reading.

Reading any toxic material

One of the chip's advantages is its ability to identify toxicity as a biological quality instead of specific toxic chemicals. There are already excellent detectors to identify specific toxic materials.. The Dip Chip, however, is designed to alert the user to overall toxicity. And because the chip measures general toxicity, it will pick up on any and all toxic materials — even those that have not been discovered or invented yet.

Beyond their ability to find toxic chemicals in the field, these chips can also be put to use in the cosmetics or pharmaceuticals industries. They could be used to detect the toxicity of new compounds, minimizing the controversial use of lab animals.

Using the same technology, the researchers have also developed a larger-scale device which allows water to flow continuously over the sensor, making it appropriate for online, real-time monitoring of water supplies.

Source:American Friends of Tel Avid University

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