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'Electronic nose' will help to diagnose diseases

Date:
February 10, 2016
Source:
National Research Tomsk State University
Summary:
Scientists have created a gas analyzer -- 'electronic nose' that is able to assess the quality of the food, cosmetic, and medical products, to diagnose diseases by evaluating exhaled gases, and even detect explosives and drugs.
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FULL STORY

Timur Muksunov is a research engineer at Tomsk State University (Russia).
Credit: Copyright Tomsk State University

The device analyzes a gas mixture using semiconductor sensors.

"Smell is determined by a combination of existing gases in the atmosphere. It is found that the conductivity of the semiconductor probe changes during sedimentation of the gas molecules from the atmosphere. This allows determining their presence," says Timur Muksunov. "During manufacture the sensor can be customized to react well to some gases, and react badly to the others."

However, according to the scientist, it is impossible to make a sensor that reacts to only one gas -- the system is needed to achieve sensitivity and selectivity. This allows, when using certain processing techniques, accurately recognizing the gas mixture in the air. Experiments confirm this.

One of them was determining the freshness of fruits and vegetables. Fruits and vegetables emit hydrogen sulphide, ammonia, and other gases. The closer the date of writing off the products, the more of these gases are in the air."

"We investigated the apples: a control part we put in the refrigerator and the rest were left at room temperature," says the scientist. "After 12 hours the device was able to identify that the second part emits gases more intensively than the control part. Now the vegetable warehouse receives products by their organoleptic characteristics, and using the device it will be able to more accurately determine the shelf life of products, which will affect its quality."

The device is fully developed, now there will be a test of its effectiveness. The work is conducted in conjunction with the Radiophysics Faculty of Tomsk State University.


Story Source:

The above post is reprinted from materials provided by National Research Tomsk State University. Note: Content may be edited for style and length.


Journal Reference:

  1. T. R. Muksunov, N. K. Maksimova, E. Yu. Sevast’yanov, S. É. Shipilov, V. P. Yakubov. Increase in the Sensitivity and Selectivity of Semiconductor Gas Sensors. Russian Physics Journal, 2015; 57 (9): 1287 DOI: 10.1007/s11182-015-0376-1

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National Research Tomsk State University. "'Electronic nose' will help to diagnose diseases." ScienceDaily. ScienceDaily, 10 February 2016. <www.sciencedaily.com/releases/2016/02/160210110804.htm>.
National Research Tomsk State University. (2016, February 10). 'Electronic nose' will help to diagnose diseases. ScienceDaily. Retrieved August 24, 2016 from www.sciencedaily.com/releases/2016/02/160210110804.htm
National Research Tomsk State University. "'Electronic nose' will help to diagnose diseases." ScienceDaily. www.sciencedaily.com/releases/2016/02/160210110804.htm (accessed August 24, 2016).

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