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    Tytuł:
    Enzymatic oxidation of neobetanin monitored by liquid chromatography with mass spectrometric detection
    Autorzy:
    Starzak, K.
    Szot, D.
    Skopińska, A.
    Swiergosz, T.
    Wybraniec, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/115945.pdf
    Data publikacji:
    2016
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    neobetanin
    betalains
    betacyanins
    horseradish peroxidase
    oxidation
    enzymatic
    spectrophotometry
    mass spectrometry
    chromatography
    neobetanina
    betalainy
    betacyjaniny
    peroksydaza chrzanowa
    enzymatyczne utlenianie
    spektrofotometria
    spektrometria masowa
    chromatografia
    Opis:
    The aim of this study was monitoring of enzymatic oxidation of neobetanin, an interesting type of betalains which is a partially oxidized betacyanin. As it belongs to betalains, it is water soluble and non-toxic, but a presence of a few functional groups makes it very reactive. Oxidation reactions were performed using horseradish peroxidase followed by spectrophotometric and mass spectrometric detection (LC-DAD-ESI-MS/MS) of obtained products. Enzymatic oxidation of neobetanin leads to a formation of new decarboxy- and dehydro-derivatives. The main identified oxidation product is 2-decarboxy-2,3-dehydroneobetanin. Searching for all formed oxidation products is extremely important for elucidation of the betalains oxidation mechanism.
    Źródło:
    Challenges of Modern Technology; 2016, 7, 1; 29-31
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on solvent systems with tetra-n-butylammonium bromide for counter-current chromatography of betalains
    Autorzy:
    Spórna-Kucab, A.
    Wysoczańska, J.
    Bartel, A.
    Świergosz, T.
    Szot, D.
    Wybraniec, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/115657.pdf
    Data publikacji:
    2016
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    betanin
    betalains
    tetra-n-butylammonium bromide
    high-speed counter-current chromatography
    Beta vulgaris L.
    betanina
    betalainy
    bromek tetra-n-butyloamoniowy
    HSCCC
    Opis:
    In this study, new two-phase solvent systems for counter-current chromatography (CCC) consisting of n-butanol and water as well as various amounts of acetic acid, acetonitrile, ethanol, acetone or ethyl acetate were tested. Additionally, tetra-n-butylammonium bromide (TBAB) was introduced into the system in the form of aqueous solutions or phosphate-citrate buffer (pH 6.7) in order to form ion-pairs with betalains. The selection of buffer pH was based on their ability to create ion pairs by tetraalkylammonium salts, with selected betalains under these conditions. In this study, it is shown that the settling time of two phases is longer with the increase of acetic acid/acetonitrile/ethanol/acetone/ethyl acetate. For selected solvent systems with high amounts of acetonitrile, ethanol and acetone two phases were not observed. The systems with acetone have the largest increase of settling time. Ethyl acetate systems were characterized by a slow settling time increase. In systems containing additionally 2% aqueous TBAB, smaller changes in settling time than in similar systems without TBAB were observed. Addition of TBAB in the buffer resulted in a prolongation of settling time. Solvent systems in which the separation between the aqueous and organic phases was visually best, were selected from among all the tested systems and the betalain partition coefficients were measured by LC-DAD-ESI-MS. The best results were observed for systems: n-butanol-water-acetic acid (2:2.5:0.75, v/v/v), n-butanol-water-acetic acid (2:2.5:1, v/v/v) and n-butanol-TBAB in water-acetonitrile (2:2.5:0.5, v/v/v).
    Źródło:
    Challenges of Modern Technology; 2016, 7, 1; 12-16
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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