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    Wyświetlanie 1-2 z 2
    Tytuł:
    Fast GC as a useful tool for authenticity assessment of kiwifruit
    Autorzy:
    Michalczuk, Paweł
    Myszka, Joanna
    Lubinska, Martyna
    Różańska, Anna
    Namieśnik, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1179549.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    DFA
    PCA
    SIMCA
    SQC
    botanical origin
    chemometric analysis
    electronic nose
    food analysis
    gas chromatography
    kiwifruit
    Opis:
    Kiwifruit is one of the healthiest fruits due to its high content of biologically active substances and nutrients. The most popular species of Actinidia (kiwifruit) are the Actinidia deliciosa fruits called kiwi and Actinidia chinensis commonly called golden kiwi, while the lesser known species is Actinidia arguta known as mini kiwi. Bioactivities and nutrients of Actinidia are influenced by species and cultivars. It is very important to find a way to distinguish kiwifruit samples from botanical and geographical origin. For this purpose, the possibility of application of electronic nose based on ultra-fast gas chromatography for differentiation three types of kiwifruit was investigated. A set of 18 samples of kiwifruits were analyzed by fast GC e-nose. This device contains two parallel chromatography columns with different polarity connected with two flame ionization detectors (μ-FIDs). Four data analysis methods were used: discriminant function analysis (DFA), principal component analysis (PCA), soft independent modeling of class analogies (SIMCA), and statistical quality control (SQC). Application of e-nose based on fast GC system allows to effective and rapid compare of aroma profiles of three types of kiwifruits. PCA, DFA and SIMCA data analysis method were for visualization the discrimination between groups of kiwifruit species. The SQC method allowed to assess the quality of the samples. All of used chemometric methods allows for full discrimination of all groups of samples. In summary, the use of ultra-fast GC with four statistical methods can be used to discrimination of kiwifruit samples due to their botanical and geographical origins.
    Źródło:
    World Scientific News; 2017, 75; 6-17
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution and origin of gaseous hydrocarbons and carbon dioxide in the Quaternary sediments at Starunia palaeontological site and vicinity (Carpathian region, Ukraine)
    Autorzy:
    Kotarba, M. J.
    Sechman, H.
    Dzieniewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/191503.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    near-surface geochemical survey
    depth gas distribution
    stable carbon isotopes
    gaseous hydrocarbon origin
    carbon dioxide origin
    Quaternary sediments
    woolly rhinoceros
    Starunia palaeontological site
    Ukrainian Carpathians
    Opis:
    Near-surface gases were investigated in Starunia, where remains of mammoth and woolly rhinoceroses were discovered at the beginning of the 20th century. Samples were collected at 30 measurement sites, from 0.8, 1.6, 2.4, 3.2 and 4.0 m depths and analysed for their molecular and isotopic compositions. Most of the methane and all higher gaseous hydrocarbons accumulated within the near-surface zone are of thermogenic origin. The distribution of thermogenic methane and higher gaseous hydrocarbons in Quaternary sediments is variable and, generally, increases with depth. Microbial methane or a mixture of microbial and thermogenic methane also occurs at the near-surface zone. The presence of hydrogen and alkenes in the near-surface gases also suggests a contribution from recent, microbial processes. Helium of crustal origin migrated through the Rinne Fault and other tectonic zones located in the study area, and was subsequently dispersed during migration through the lithologically diversified Pleistocene and Holocene sediments. The high variability of the carbon dioxide concentration and stable carbon isotope composition at various depths in the near-surface zone is caused by its polygenetic origin (thermogenic, microbial, and oxidation of hydrocarbons and Quaternary organic matter), and also by its dissolution in water and oil during migration through lithologically diversified Pleistocene and Holocene sediments. Zones of thermogenic methane occurrence within Pleistocene sediments, dominated by muds saturated with bitumen and brines, provide the most favourable environment for preservation of large extinct mammals. It is likely that during the Pleistocene winters, when thick ice and snow covered the tundra lake and swamp, zones of outflow of brines, oils, helium, and thermogenic gaseous hydrocarbons had a higher temperature, which could have resulted in melting and cracking of the ice cover and drowning of large mammals. The most favourable conditions for preservation of large, extinct mammals probably still exists in the vicinity of sampling probe sites Nos 21, 22, 23 and 36. Zones of dominance of microbial methane concentrations are less favourable sites for preservation of extinct mammals, because this methane was generated within recent swamps and also within recent descending meteoric waters which infiltrated into Pleistocene and Holocene sediments. Older Pleistocene microbial gases have already escaped to the atmosphere.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2009, 79, No 3; 403-419
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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