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Sensor detects whiff of bad breath

Date:
June 6, 2018
Source:
American Chemical Society
Summary:
Ever wish you could do a quick "breath check" before an important meeting or a big date? Now researchers have developed a sensor that detects tiny amounts of hydrogen sulfide gas, the compound responsible for bad breath, in human exhalations.
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Ever wish you could do a quick "breath check" before an important meeting or a big date? Now researchers, reporting in ACS' journal Analytical Chemistry, have developed a sensor that detects tiny amounts of hydrogen sulfide gas, the compound responsible for bad breath, in human exhalations.

According to the American Dental Association, half of all adults have suffered from bad breath, or halitosis, at some point in their lives. Although in most cases bad breath is simply an annoyance, it can sometimes be a symptom of more serious medical and dental problems. However, many people aren't aware that their breath is smelly unless somebody tells them, and doctors don't have a convenient, objective test for diagnosing halitosis. Existing hydrogen sulfide sensors require a power source or precise calibration, or they show low sensitivity or a slow response. Il-Doo Kim and coworkers wanted to develop a sensitive, portable detector for halitosis that doctors could use to quickly and inexpensively diagnose the condition.

To develop their sensor, the team made use of lead(II) acetate -- a chemical that turns brown when exposed to hydrogen sulfide gas. On its own, the chemical is not sensitive enough to detect trace amounts (2 ppm or less) of hydrogen sulfide in human breath. So the researchers anchored lead acetate to a 3D nanofiber web, providing numerous sites for lead acetate and hydrogen sulfide gas to react. By monitoring a color change from white to brown on the sensor surface, the researchers could detect as little as 400 ppb hydrogen sulfide with the naked eye in only 1 minute. In addition, the color-changing sensor detected traces of hydrogen sulfide added to breath samples from 10 healthy volunteers.


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Journal Reference:

  1. Jun-Hwe Cha, Dong-Ha Kim, Seon-Jin Choi, Won-Tae Koo, Il-Doo Kim. Sub-Parts-per-Million Hydrogen Sulfide Colorimetric Sensor: Lead Acetate Anchored Nanofibers toward Halitosis Diagnosis. Analytical Chemistry, 2018; DOI: 10.1021/acs.analchem.8b01273

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American Chemical Society. "Sensor detects whiff of bad breath." ScienceDaily. ScienceDaily, 6 June 2018. <www.sciencedaily.com/releases/2018/06/180606120430.htm>.
American Chemical Society. (2018, June 6). Sensor detects whiff of bad breath. ScienceDaily. Retrieved December 13, 2024 from www.sciencedaily.com/releases/2018/06/180606120430.htm
American Chemical Society. "Sensor detects whiff of bad breath." ScienceDaily. www.sciencedaily.com/releases/2018/06/180606120430.htm (accessed December 13, 2024).

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