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Wyszukujesz frazę "two-dimensional chromatography" wg kryterium: Temat


Wyświetlanie 1-7 z 7
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:
Dwuwymiarowa chromatografia gazowa – rozwój techniki na przestrzeni lat
Two-dimensional gas chromatography – technique development over the years
Autorzy:
Gąsior, D.
Powiązania:
https://bibliotekanauki.pl/articles/392089.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
Tematy:
analiza chemiczna
chromatografia gazowa
chromatografia dwuwymiarowa
modulacja
rozdzielczość
technika „hart-cutting”
chemical analysis
gas chromatography
two-dimensional chromatography
modulation
resolution
heart-cutting method
Opis:
Dwuwymiarowa chromatografia gazowa jest prężnie rozwijającą się techniką analityczną, charakteryzuje się zwiększoną zdolnością rozdzielczą oraz większą czułością w porównaniu do standardowej jednowymiarowej techniki chromatografii gazowej, co pozwala na znaczne obniżenie granicy wykrywalności analitów. Bardzo dobrze sprawdza się w przypadku analiz skomplikowanych próbek o złożonym składzie. W pracy scharakteryzowana została zasada, w oparciu o którą funkcjonuje dwuwymiarowa chromatografia gazowa, ze szczególnym uwzględnieniem budowy modulatorów jako istoty całego systemu. Omówiony został sposób prezentacji wyników oraz etap ich wizualizacji. Technika dwuwymiarowej chromatografii gazowej wykorzystywana jest coraz powszechniej, między innymi w analizie produktów ropopochodnych, analizie środowiskowej do oznaczania związków toksycznych dla organizmów, w analizie produktów żywnościowych oraz w kryminalistyce. W artykule przedstawiono wybrane przykłady aplikacyjne omawianej techniki.
Two-dimensional gas chromatography is rapidly developing analytical technique, which is characterized by an increased resolving ability and higher sensitivity compared to standard technique of one-dimensional gas chromatography, which allows for a significant reduction in the limit of detection of analytes. This technique is ideally suited for the analysis of complicated samples with complex composition. The paper characterizes the principle of functioning of the two-dimensional gas chromatography, with particular emphasis on the construction of modulators, which are the essence of the system. Presentation of the results and the step of visualization were explained. Two-dimensional gas chromatography technique is increasingly popular, inter alia, in the petroleum products analysis, environmental analysis for the determination toxic compounds to the organisms, in the food products analysis and in the criminology. The article presents some examples of application of the technique.
Źródło:
Prace Instytutu Ceramiki i Materiałów Budowlanych; 2013, R. 6, nr 13, 13; 22-36
1899-3230
Pojawia się w:
Prace Instytutu Ceramiki i Materiałów Budowlanych
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
Tytuł:
Dwuwymiarowa separacja technikami chromatografii i elektroforezy ze szczególnym uwzględnieniem połączenia ich w proces jednoetapowy
Two-dimensional separation with chromatography and electrophoresis techniques with special focus on their combination into single process
Autorzy:
Łopaciuk, E.
Dzido, T. H.
Powiązania:
https://bibliotekanauki.pl/articles/171869.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
separacja dwuwymiarowa
elektroforeza
elektrochromatografia
chromatografia cieczowa
rozdzielanie dwuwymiarowe ciągłe
two dimensional separation
electrophoresis
electrochromatography
liquid chromatography
continuous two-dimensional separation
Opis:
Liquid chromatography and electrophoresis techniques are very often applied in contemporary laboratory practice. These techniques usually show different separation selectivity. It is due to various separation mechanisms involved in these two modes. In the former, partition of solutes between stationary and mobile phases influences on separation selectivity and retention contrary to the latter in which electrophoretic effect is involved in separation mechanism. The features mentioned are very useful for combination of these two techniques into two-dimensional separation of complicated samples of biomedical and environmental origin. Development of such approach is a very promising for contemporary separation sciences. The paper presents an overview of two-dimensional separation techniques, in which both liquid chromatography and electrophoresis have been involved especially in continuous mode.
Źródło:
Wiadomości Chemiczne; 2013, 67, 9-10; 899-927
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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