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    Wyświetlanie 1-6 z 6
    Tytuł:
    Improving the accuracy of the NDIR-based CO2 sensor for breath analysis
    Autorzy:
    Prokopiuk, Artur
    Bielecki, Zbigniew
    Wojtas, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2052156.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    NDIR
    CO2 sensors
    breath analysis
    absorption spectroscopy
    Opis:
    The paper presents an analysis and practical study of the temperature and pressure influence on a non-dispersive infrared (NDIR) sensor for measuring the concentration of carbon dioxide in human breath. This sensor is used for monitoring patients’ carbon dioxide (CO2) in the exhaled air. High precision and accuracy of CO2 concentration measurements are essential in air sampling systems for breath analysers. They, however, require an analysis of the influence of the human exhaled air pressure and temperature on the NDIR CO2 sensor. Therefore, analyses of the changes in concentration were carried out at a pressure from 986 mbar to 1027 mbar and a temperature from 20°C to 36°C. Finally, corresponding correction coefficients were determined which allow to reduce the relative uncertainty of CO2 sensor measurements results from 19% to below 5%.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 4; 803-812
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exhaled breath analysis by resistive gas sensors
    Autorzy:
    Chludziński, Tomasz
    Kwiatkowski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/221713.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    resistive gas sensors
    data processing
    exhaled breath analysis
    Opis:
    Breath analysis has attracted human beings for centuries. It was one of the simplest methods to detect various diseases by using human smell sense only. Advances in technology enable to use more reliable and standardized methods, based on different gas sensing systems. Breath analysis requires the detection of volatile organic compounds (VOCs) of the concentrations below individual ppm (parts per million). Therefore, advanced detection methods have been proposed. Some of these methods use expensive and bulky equipment (e.g. optical sensors, mass spectrometry - MS), and require time-consuming analysis. Less accurate, but much cheaper, are resistive gas sensors. These sensors use porous materials and adsorption-desorption processes, determining their physical parameters. We consider the problems of applying resistive gas sensors to breath analysis. Recent advances were underlined, showing that these economical gas sensor scan be efficiently employed to analyse breath samples. General problems of applying resistive gas sensors are considered and illustrated with examples, predominantly related to commercial sensors and their long-term performance. A setup for collection of breath samples is considered and presented to point out the crucial parts and problematic issues.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 1; 81-89
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Instrumental techniques used in the analysis of exhaled air
    Autorzy:
    Kalinowska, K.
    Wojnowski, W.
    Namieśnik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1179564.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Breath analysis
    Diagnosis
    Disease-state monitoring
    Lung disease
    Metabolic disorder
    Volatile organic compound
    Opis:
    Exhaled air composition changes depending on the health status of the patient, making it possible to use breath analysis for diagnosis and monitoring purposes. Despite the fact that it is not yet used in every day medical practice, it potential application could facilitate the diagnostics of various diseases such as metabolic disorders, respiratory tract and gastrointestinal diseases. Described in this paper are different application of exhaled air analysis. Additionally, currently available techniques of sample analysis are discussed, as well as their potential advantages and disadvantages.
    Źródło:
    World Scientific News; 2017, 75; 64-72
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oddech codzienny
    Daily breath
    Autorzy:
    Ligor, Tomasz
    Rudnicka, Joanna
    Ratiu, Ileana Andreea
    Monedeiro, Fernanda
    Monedeiro-Milanowski, Maciej
    Buszewski, Bogusław
    Powiązania:
    https://bibliotekanauki.pl/articles/1413274.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    analiza wydychanego powietrza
    lotne związki organiczne
    biomarkery
    chromatografia gazowa
    spektrometria mas
    breath analysis
    volatile organic compounds
    biomarkers
    gas chromatography
    mass spectrometry
    Opis:
    The odor of human body has facilitated diagnosis for a long time. Sniffing the body, breath, urine and even feces became one of the useful methods in ancient medicine. For centuries, the sweet smell of the breath was associated with diabetes, the fishy smell was associated with liver disease, measles was associated with the smell of feathers, typhoid with the smell of fresh bread, and tuberculosis with stale beer. Hippocrates also linked the smell of the human body and disease, claiming that the smell of a sick person is different from that of a healthy one. He classified the characteristic odors of the body into sweet, musty, fishy and rotten. The father of chemical analysis of breath was Antonie Lavoisier, who found that carbon dioxide is exhaled by guinea pigs. The pioneer of modem breath analysis was Linus Pauling, who in 1971 presented the results of breath studies using gas chromatography (GC), showing the presence of over 200 substances. Exhaled air containing approximately 78% N2, 17% O2, 3% CO2 and up to 6% water vapor. The exact concentrations of individual inorganic gases depend on many factors, mainly physical exercise, cardiac output, and lung ventilation. A mixture of many volatile organic compounds is a much smaller group of substances at concentrations 100 ppm. The substances in the breath can come from human metabolism and enter into the body by inhaled air and food. Volatile organic compounds present in the breath that can be divided into different chemical classes e.g. saturated hydrocarbons (ethane, pentane, aldehydes), unsaturated hydrocarbons (isoprene), ketones (acetone), sulfur-containing compounds (methyl mercaptan, dimethyl sulfide, dimethyl disulphide, carbon disulphide, carbonyl sulphide) and containing nitrogen (amines). Endogenous substances in the breath can be used to track physiological and pathological processes in the body. Chemical analysis of the breath can provide information regarding biochemical processes in the organism and human health. Compared to many medical diagnostic methods, it is painless, non-invasive and safe. Nowadays, the main purpose of breath analysis is to identify volatile organic compounds that can be used as markers of various diseases. Research focused on detection of lung cancer based on specific volatile organic compounds in the exhaled air is carried out in many laboratories. Rapid and non-invasive methods for early detection of lung cancer and chronic obstructive pulmonary disease is crucial for early diagnosis. This mini review presents background of breath, briefly describes main volatiles, their biochemical origin as well as potential application of exhaled gases analysis.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 7-8; 911-922
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exhaled breath analysis - quantifying the storage of lipophilic compounds in the human body
    Analiza wydechu - oznaczanie zawartości związków lipofilowych w organizmie człowieka
    Autorzy:
    Amann, A.
    King, J.
    Kupferthaler, A.
    Uterkofler, K.
    Koc, H.
    Teschl, S.
    Hinterhuber, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/126188.pdf
    Data publikacji:
    2009
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    exhaled breath analysis
    isoprene
    proton transfer reaction mass spectrometry (PTR-MS)
    analiza wydechu człowieka
    izopren
    metoda reakcji przeniesienia protonu wraz ze spektrometrią mas (PTR-MS)
    Opis:
    Real-time analysis of exhaled breath is a promising new method to get quantitative information on lipophilic compounds stored in the human body. Some pilot results are presented on isoprene, which is produced as a by-product of the cholesterol synthesis and appears in exhaled breath at concentrations of about 100 parts-per-billion (ppb). The results have been obtained using proton transfer reaction mass spectrometry (PTR-MS) from healthy volunteers undergoing an ergometer challenge test (with 75 W). Peak exhalation flow of isoprene is about 400 nmol/min shortly after start of the challenge. The setup holds great potential in capturing continuous dynamics of non-polar, low-soluble VOCs over a wide measurement range with simultaneous recording of physiological parameters affecting exhalation kinetics.
    Przedstawiono wstępne wyniki oznaczenia stężenia izoprenu w wydechu zdrowego człowieka. Izopren jest produktem ubocznym reakcji syntezy cholesterolu. Do oznaczenia zastosowano metodę reakcji przeniesienia protonu przy wykorzystaniu spektrometrii mas (PTR-MS).
    Źródło:
    Proceedings of ECOpole; 2009, 3, 1; 9-13
    1898-617X
    2084-4557
    Pojawia się w:
    Proceedings of ECOpole
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wodne roztwory wzorcowe etanolu do wzorcowania analizatorów wydechu sporządzane metodą wagową
    Aqueous standard solutions of ethanol for calibration of breath simulators made by gravimetric preparation
    Autorzy:
    Janko, Piotr
    Kordulasiński, Robert
    Wasilewska, Jolanta
    Lenard, Elżbieta
    Powiązania:
    https://bibliotekanauki.pl/articles/952558.pdf
    Data publikacji:
    2017
    Wydawca:
    Główny Urząd Miar
    Tematy:
    alkomat
    analiza wydychanego powietrza
    wzorcowanie
    breath analyzer
    analysis of exhaled air
    calibration
    Opis:
    Analizatory wydechu– przyrządy do pomiaru stężenia masowego alkoholu (etanolu) w powietrzu wydychanym, są wzorcowane w Polsce za pomocą wilgotnych wzorców gazowych wytwarzanych in situ w symulatorze wydechu z wodnych roztworów wzorcowych etanolu. W artykule przedstawiono opracowaną w GUM procedurę wagową sporządzania ciekłych wzorców etanolowych, wraz ze szczegółową analizą potencjalnych źródeł niepewności wyznaczonej zawartości etanolu.
    Breath analyzers are instruments for determination of alcohol (ethanol) mass concentration in exhaled air. These instruments are calibrated in Poland by means of wet gas standards produced in situ from aqueous standard solutions in breath simulators. The paper presents a procedure developed at GUM for the gravimetric preparation of liquid ethanol standards along with a detailed analysis of the potential sources of uncertainty of assigned ethanol content.
    Źródło:
    Metrologia i Probiernictwo : biuletyn Głównego Urzędu Miar; 2017, 3-4 (18-19); 17-27
    2300-8806
    Pojawia się w:
    Metrologia i Probiernictwo : biuletyn Głównego Urzędu Miar
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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