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    Wyświetlanie 1-4 z 4
    Tytuł:
    Application of gas chromatography to evaluate the quality of rapeseed oil
    Autorzy:
    Lubinska, Martyna
    Namieśnik, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1179570.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    edible oils
    mass spectrometry
    quality markers
    thermal degradation
    two-dimensional gas chromatography
    volatile organic compounds
    Opis:
    Two-dimensional gas chromatography is an analytical technique, which is increasingly being used in food research. Through the analysis of volatile fraction, it is possible to determine the quality of food products. One of the reasons for the deterioration of food is thermal degradation. Products that are often subject to degradation reactions due to temperatures are edible oils. In the thesis, the results of edible oils with different botanical origin are presented. The samples of oil were heated at temperatures of 20 °C, 60 °C, 100 °C, 140 °C and 180 °C. Based on the results of the chromatographic analysis, potential indicators of thermal degradation of edible oils were selected. The last step was to quantify the selected compounds to confirm that the typed chemical compounds are the markers of thermal decomposition of cooking oils. To calibrate, the method of standard additions was chosen
    Źródło:
    World Scientific News; 2017, 75; 96-105
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Is it possible to detect lung cancer by trained dogs?
    Autorzy:
    Rudnicka, J.
    Walczak, M.
    Jezierski, T.
    Buszewski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2052420.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
    Tematy:
    breath samples
    volatile organic compounds
    solid phase microextraction
    gas chromatography-mass spectometry
    canine olfactory
    Opis:
    During the illness are released volatile organic compounds with specific smell which could have in diagnosis of diseases. The first aim of the study was qualitative and quantitative analysis of exhaled breath samples obtained from patients with lung cancer, healthy volunteers and people with other lung diseases by gas chromatography-mass spectrometry. This study showed that twenty compounds propane, ethanol, isobutane, butane, propanal, 1-propanol, 2-propanol, 2-methylfuran, 2-butanone, benzene, 2-pentanone, pentanal, hexanal, cyclohexanone, 4-heptanone, 2,4-dimethylheptane, 2,3,4-trimethylhexane, 2,3,5-trimethylhexane, 4-methyloctane, α-pinene separated two research groups of patients and healthy controls. The second goal was to evaluate the sensitivity and specificity of canine scent detection using 5 station scent lineup. Among lung cancer patients and complementary samples, overall sensitivity of canine scent detection was 85.54%, while specificity was 71.84%.
    Źródło:
    Health Problems of Civilization; 2015, 09, 2; 19-26
    2353-6942
    2354-0265
    Pojawia się w:
    Health Problems of Civilization
    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:
    Zastosowanie chromatografii gazowej i elektroforezy kapilarnej do analizy napojów orzeźwiających
    Application of gas chromatography and capillary electrophoresis for refreshing drinks analysis
    Autorzy:
    Wideł, D.
    Oszczudłowski, J.
    Witkiewicz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/271382.pdf
    Data publikacji:
    2012
    Wydawca:
    Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
    Tematy:
    chromatografia gazowa ze spektrometrią mas
    elektroforeza kapilarna
    mikroekstrakcja do fazy stacjonarnej
    lotne związki organiczne
    aniony
    gas chromatography-mass spectrometry
    capillary electrophoresis
    solid phase microextraction
    volatile organic compounds
    anions
    Opis:
    Wykonano analizę wybranych lotnych związków organicznych w czterech napojach orzeźwiających metodą chromatografii gazowej ze spektrometrią mas. Dodatkowo zbadano zawartość wybranych anionów nieorganicznych oraz organicznych we wspomnianych napojach metodą elektroforezy kapilarnej. Lotne związki organiczne wyizolowano z fazy nadpowierzchniowej napojów techniką mikroekstrakcji do fazy stacjonarnej. We wszystkich próbkach wykryto D-limonen, odpowiedzialny za aromat cytrynowy.
    Gas chromatography-mass spectrometry method was applied for selected volatile organic compounds analysis of four similar refreshing drinks. The presence of selected inorganic and organic anions in mentioned drinks were additionally determined by capillary electrophoresis method. Solid phase microextraction was applied to isolate volatile organic compounds from drinks head space. D-limonene, responsible of lemon flavour, was determined in all samples.
    Źródło:
    Aparatura Badawcza i Dydaktyczna; 2012, 17, 3; 79-84
    2392-1765
    Pojawia się w:
    Aparatura Badawcza i Dydaktyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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