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Open AccessArticle

CO2 Laser Photoacoustic Spectrometer for Measuring Acetone in the Breath of Lung Cancer Patients

1
Department of Physics, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia
2
Department of Physics, University of Lampung, Bandar Lampung 35141, Indonesia
*
Author to whom correspondence should be addressed.
Biosensors 2020, 10(6), 55; https://doi.org/10.3390/bios10060055
Received: 6 April 2020 / Revised: 19 May 2020 / Accepted: 24 May 2020 / Published: 27 May 2020
(This article belongs to the Special Issue Advanced Biosensing Technologies in Medical Applications)
A CO2 laser has the advantages of being high in power and having many laser lines in the 9–11 µm infrared region. Thus, a CO2 laser photoacoustic spectrometer (PAS) can have a multi-component measurement capability for many gas compounds that have non-zero absorption coefficients at the laser lines, and therefore can be applied for measuring several volatile organic compounds (VOCs) in the human breath. We have developed a CO2 laser PAS system for detecting acetone in the human breath. Although acetone has small absorption coefficients at the CO2 laser lines, our PAS system was able to obtain strong photoacoustic (PA) signals at several CO2 laser lines, with the strongest one being at the 10P20 line. Since at the 10P20 line, ethylene and ammonia also have significant absorption coefficients, these two gases have to be included in a multi-component measurement with acetone. We obtained the lowest detection limit of our system for the ethylene, acetone, and ammonia are 6 ppbv, 11 ppbv, and 31 ppbv, respectively. We applied our PAS system to measure these three VOCs in the breath of three groups of subjects, i.e., patients with lung cancer disease, patients with other lung diseases, and healthy volunteers. View Full-Text
Keywords: lung cancer; acetone; volatile organic compounds; CO2 laser photoacoustic lung cancer; acetone; volatile organic compounds; CO2 laser photoacoustic
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Mitrayana; Apriyanto, D.K.; Satriawan, M. CO2 Laser Photoacoustic Spectrometer for Measuring Acetone in the Breath of Lung Cancer Patients. Biosensors 2020, 10, 55.

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