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    Tytuł:
    Reducing the duration of separation by two-dimensional TLC on the plates of small size using the S/min-chamber
    Skrócenie czasu rozdzielania za pomocą dwuwymiarowej TLC na płytkach o małych wymiarach przy użyciu komory S/min
    Autorzy:
    Berezkin, V. G.
    Khrebtova, S. S.
    Witkiewicz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/270494.pdf
    Data publikacji:
    2011
    Wydawca:
    Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
    Tematy:
    chromatografia dwuwymiarowa
    analiza TLC
    two-dimensional chromatography
    TLC analysis
    Opis:
    The new rapid TLC analysis is proposed based on simultaneous using two-dimensional chromatography on the plates of the small size and the S/min-chamber with the minimal gas volume. It was shown that the proposed method on the plates of the size 5x5 cm is characterized by substantially less expenditure of time (by 2530%) to compare with separation on the plates of the size of 10x10 cm. The implementation of the proposed method is not complicated and it can be recommended for use in analytical practice.
    Zaproponowano nowy sposób szybkiej analizy TLC polegający na zastosowaniu dwuwymiarowej chromatografii na małych płytkach w komorach S/min o małej pojemności. Wykazano, że zaproponowany sposób, przy zastosowaniu płytek o wymiarach 5x5 cm, charakteryzuje się znacznie krótszym czasem rozwijania chromatogramów (o 25-30 %) w porównaniu z rozwijaniem na płytkach o wymiarach 10x10 cm. Wprowadzenie zaproponowanej metody nie jest skomplikowane i może być zalecane do stosowania w praktyce analitycznej.
    Źródło:
    Aparatura Badawcza i Dydaktyczna; 2011, 16, 4; 15-22
    2392-1765
    Pojawia się w:
    Aparatura Badawcza i Dydaktyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-dimensional gas chromatography – principles and application in fruits analysis
    Autorzy:
    Lubinska, Martyna
    Namieśnik, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1179569.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    aparature
    applications
    history
    principles
    two-dimensional gas chromatography
    Opis:
    Two-dimensional gas chromatography is a rapidly developing analytical technique. One of the major uses of this technique is its use for food analysis. The paper presents the principle of operation and history of this analytical technique. The specification of the two-dimensional gas chromatography technique has been discussed. The principles of separation of ingredients and application of the method, particularly in the analysis of food products, have also been described. A literature review was also done, presenting the use of two-dimensional gas chromatography for the analysis of fruit and fruit products.
    Źródło:
    World Scientific News; 2017, 75; 89-95
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of volatile fraction selected hybrid fruits using chromatographic techniques
    Autorzy:
    Myszka, J.
    Lubinska, M.
    Różańska, A.
    Namieśnik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1179556.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    VOC
    electronic nose
    hybrid fruits
    thermal desorption
    two-dimensional gas chromatography
    volatile organic compounds
    Opis:
    At present, "healthy eating" is gaining in popularity. Many people associate this term with eating plenty of vegetables and fruits. The basic elements influencing the selection of fruit are their appearance and smell. Of course, their origin and impact on human health are also very important. In recent years, exotic fruits have become increasingly accessible, making them gaining popularity, even among Poles. You can also meet plants created by crossing two varieties or species - so-called hybrids. They arise as a result of intersection of inbred lines created by multiple self-pollination of beneficial individuals. Although it is known that many of the hybrids created so far, With higher crop yields and better pro-health properties, these plants have not yet been thoroughly investigated. The purpose of the research was to compare the volatile fraction of hybrid fruit with the fruits which they came from. Thanks to such comparison, it was possible to classify fruits in terms of their quality, freshness and suitability for consumption. The chemical compounds that occur in the volatile fruit fraction in humans produce in people the aroma characteristic of each of them. By observing differences and similarities, it is possible to distinguish between them. To carry out the experiment, a comprehensive two-dimensional gas chromatography technique coupled with a mass spectrometer with time of flight mass spectrometer was used. In addition, samples were analyzed using an electronic nose, which uses ultrasonic gas chromatography.
    Źródło:
    World Scientific News; 2017, 75; 33-49
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Distribution, occurrence, and cluster analysis of new polyprenyl acetones and other polyisoprenoids from North Sumatran mangroves
    Autorzy:
    Basyuni, Mohammad
    Sagami, Hiroshi
    Baba, Shigeyuki
    Oku, Hirosuke
    Powiązania:
    https://bibliotekanauki.pl/articles/956820.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    chemotaxonomic marker
    dolichol
    indonesian mangroves
    polyprenol
    two-dimensional thin
    layer chromatography
    Opis:
    Background. Mangrove forests have long been known as a source of phytochemical compounds producing various secondary metabolites. Despite the ubiquitous diversity of polyisoprenoids in the plant kingdom, few studies have focused on the distribution of polyisoprenoids in mangrove plants. The present study describes the distribution and occurrence of a new class of prenyl derivates – polyprenyl acetone as well as other polyisoprenoids in fourteen species of Indonesian mangroves, with an emphasis on chemotaxonomic importance. Material and methods. The leaves and roots of fourteen North Sumatran mangroves were analyzed using two-dimensional thin layer chromatography and electrospray ionization mass spectrometry. Results. In the leaves, the distribution of several types of polyprenyl acetones, polyprenols, and dolichols was detected and classified into types: type-I, having a predominance of dolichols over polyprenols (more than nine-fold), was observed in Acrostichum aureum (younger leaves), Avicennia alba, Av. lanata, Av. officinalis, Bruguiera parviflora, Ceriops tagal, Nypa fruticans, and Rhizophora mucronata; type-II, having the presence of both polyprenols and dolichols, was observed in Acanthus ilicifolius, Acr. aureum, B. cylindrica, and R. apiculata; type-III having a predominance of polyprenols over dolichols (more than nine-fold), was not observed in any North Sumatran mangroves; type-IV, having the presence of both polyprenyl acetones and dolichols, was observed in Aegiceras corniculatum; type-V, having the presence of polyprenyl acetones, polyprenols, and dolichols, was observed in Sonneratia caseolaris and Xylocarpus granatum. In the roots, type-I distribution was observed in Ae. corniculatum, Av. alba, Av. lanata, Av. officinalis, B. parviflora, C. tagal, N. fruticans, R. apiculata, R. mucronata, S. caseolaris, and X. granatum. Type-II distribution was observed in Ac. ilicifolius, Acr. aureum, and B. cylindrica. Type-III, -IV, and -V distributions were not observed in mangrove roots. Cluster analysis demonstrated that polyisoprenoid patterns in the leaves and roots form distinct separation into appropriate genera and tribe, suggesting that mangrove polyisoprenoids are chemotaxonomically significant. Conclusions. The major polyisoprenoid alcohols in Indonesian mangroves were found to be dolichols rather than polyprenols. The diversity of polyisoprenoids in both leaves and roots of mangroves may provide chemotaxonomic marker. The discovery of a new class of polyprenyl acetone is the first report from mangrove plants.
    Źródło:
    Dendrobiology; 2017, 78; 18-31
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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