Laser sensors for trace gases in human breath

Puiu, A.; Giubileo, G.; Bangrazi, Caterina

doi:10.1080/03067310500154395

Cited by 16 publications

(8 citation statements)

References 5 publications

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“…For analysing the content of ethylene, the bags are transported in the laboratory and the stored breath samples are transferred from the bags into the measuring cell through a CO 2 scrubber by means of a synthetic air flux regulated by high precision electronic flux meters. The LPAS apparatus we used already produced results in the field of biology and medicine about the detection of trace ethylene both in vitro and in vivo [8,17].…”

Section: Spectroscopy Based Breath Analysismentioning

confidence: 99%

Neuroendocrine and Psychological Assessment in a Guinness 10 Days Scuba Dive

et al. 2007

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This study was designed to evaluate physiological and psychological stress parameters in 2 professional trained scuba divers, using a unique physiopathologic model, offered by the guinness 240 hours scuba dive. Two scuba dive masters have spent 240 hours at 6 - 8 meters depth (26.4 ft) in Ponza Island water (Italy). Blood samples were collected daily in the underwater bell; samples were carried out of water in waterproof bags. Breath samples were collected, measuring ethylene release. Psychological assessment was performed using the State and Trait Anxiety Inventory and the Zung self-rating depression scale. In the studied subjects, cortisol and prolactin showed physiological pulsatile secretion. Breath ethylene didn't exceed normal values. At the start of the study, no subjects showed high levels of state anxiety, trait anxiety and current depression. Psychometric scales scores remained steady during the diving period and no subjects showed anxiety and/or depression and/or panic symptoms during the time of observation. The present study shows that, although the long-time diving, well trained professional divers did not develop anxiety and/or depression. No subject discontinued the diving due to occurred psychological disorders or systemic events. The present report shows that the long-term diving permanence is possible, at least in well trained scuba divers.

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Section: Spectroscopy Based Breath Analysismentioning

confidence: 99%

Neuroendocrine and Psychological Assessment in a Guinness 10 Days Scuba Dive

et al. 2007

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“…The most reactive and therefore potentially dangerous, oxygen radical is the hydroxyl radical (HO•) [149]. A laser photoacoustic spectroscopy (PAS) sensor for online ethylene monitoring and an adjustable diode laser absorption spectroscopy (TDLAS) sensor for ethane detection, was developed by Puiu et al the ENEA Frascati Molecular Spectroscopy Laboratory [150]. During the experimental study in cooperation with the Umberto I Hospital (Radiology Institute) of Rome, they were able to detect very low concentrations (under 1 ppb) of trace ethylene content in the air exhaled by patients, following X-ray therapy.…”

Section: Lpas In Radiotherapymentioning

confidence: 99%

Applications of Near Infrared Photoacoustic Spectroscopy for Analysis of Human Respiration: A Review

et al. 2020

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In this review, applications of near-infrared photoacoustic spectroscopy are presented as an opportunity to evaluate human respiration because the measurement of breath is fast, intact and simple to implement. Recently, analytical methods for measuring biomarkers in exhaled air have been extensively developed. With laser-based photoacoustic spectroscopy, volatile organic compounds can be identified with high sensitivity, at a high rate, and with very good selectivity. The literature review has shown the applicability of near-infrared photoacoustic spectroscopy to one of the problems of the real world, i.e., human health. In addition, the review will consider and explore different breath sampling methods for human respiration analysis.

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“…It has been proven to be an excellent tool for trace gas analysis in application of environment monitoring [2], biological metabolism [3] and industrial producing [4], with highly sensitive, precise and accurate. Ethylene acts as a hormone in higher plants ripening the fruits and has a high reactivity with hydroxyl radicals [5], so it plays a significant role in atmospheric chemistry, global climate and biological metabolism [6,7]. It also will explode when mixed with air at certain concentration and ignited by naked flame and is used as the index gas in coal mines for the early detection of spontaneous combustion of coal [8,9].…”

Section: Introductionmentioning

confidence: 99%

Near infrared tunable diode laser absorption spectroscopy for ethylene concentration analysis

Pan

Dai

Zhang

et al. 2013

Eighth International Symposium on Precision Engineering Measurement and Instrumentation

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The absorption spectra of ethylene (C 2 H 4 ) located at v5+v9 band near 1626nm involve some strong peaks that are suitable for trace gas concentration detection. They are interference free from other abundant molecules that are normally present in the atmosphere. An ethylene analysis system has been developed based on the tunable diode laser absorption spectroscopy. The high resolution transmission of ethylene near 1626nm has been measured by this system under different concentration. The severe overlapping between neighboring spectral lines of ethylene is observed and they cannot be separated with each other easily under atmospheric pressure and room temperature, so a multi-peaks spectrum recognition method is proposed to separate the ethylene spectrum from other interference gas while the ethylene concentration is ultra low. A mixture of high concentration methane, low concentration ethylene with air is used to evaluate the recognition efficiency. The result shows that the ethylene line can be abstract from strong background interference using multi-peaks spectrum recognition method and the accuracy of concentration measurement can reach about 5% comparing with a mass flow meter.

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Laser sensors for trace gases in human breath

Cited by 16 publications

References 5 publications

Neuroendocrine and Psychological Assessment in a Guinness 10 Days Scuba Dive

Neuroendocrine and Psychological Assessment in a Guinness 10 Days Scuba Dive

Applications of Near Infrared Photoacoustic Spectroscopy for Analysis of Human Respiration: A Review

Near infrared tunable diode laser absorption spectroscopy for ethylene concentration analysis

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