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. 2020 Nov 29;20(23):6827. doi: 10.3390/s20236827

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Breath measurement using the modified IPA bio-sniffer. The IPA concentration was detected to be 17.9 ppb in this sample. The pattern of signal temporal change was similar to the standard IPA measurement.