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    Wyświetlanie 1-3 z 3
    Tytuł:
    Laccase immobilisation on mesostructured silicas
    Autorzy:
    Bryjak, J.
    Szymańska, K.
    Jarzębski, A.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/185475.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laccase
    Immobilization
    mesostructured enzyme carrier
    thermal stability
    lakaza
    unieruchomienie
    enzym
    stabilność termiczna
    Opis:
    Extracellular laccase produced by the wood-rotting fungus Cerrena unicolor was immobilised covalently on the mesostructured siliceous foam (MCF) and three hexagonally ordered mesoporous silicas (SBA-15) with different pore sizes. The enzyme was attached covalently via glutaraldehyde (GLA) or by simple adsorption and additionally crosslinked with GLA. The experiments indicated that laccase bound by covalent attachment remains very active and stable. The best biocatalysts were MCF and SBA-15 with Si–F moieties on their surface. Thermal inactivation of immobilised and native laccase at 80°[degrees]C showed a biphasic-type activity decay, that could be modelled with 3parameter isoenzyme model. It appeared that immobilisation did not significantly change the mechanism of activity loss but stabilised a fraction of a stable isoform. Examination of time needed for 90% initial activity loss revealed that immobilisation prolonged that time from 8 min (native enzyme) up to 155 min (SBA-15SF).
    Źródło:
    Chemical and Process Engineering; 2012, 33, 4; 611-620
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetics of Enantiomerically Enriched Synthesis of Solketal Esters Using Native and SBA-15 supported P. Fluorescens Lipase
    Autorzy:
    Zniszczoł, A.
    Szymańska, K.
    Kocurek, J.
    Bryjak, J.
    Walczak, K.
    Jarzębski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/185676.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bioenantioselectivity
    solketal
    ping-pong kinetics
    transesterification
    kinetyka ping-ponga
    transestryfikacja
    Opis:
    The studies showed that alkaline lipase from Pseudomonas fluorescens enables an irreversible transesterification of vinyl esters to give enantiomeric excess (eeR) of about 80% using vinyl butyrate as acyl donor and diisopropyl ether as a solvent, at partially optimized conditions. For the native lipase the process was adequately described by a five-parameter Ping-Pong Bi Bi model for both enantiomers plus expression accounting for the formation of enzyme-acyl donor complex, but for the same lipase supported on mesoporous materials of SBA-15-Oc type, R-product inhibition also had to be taken into account. The use of hydrophobic support increased by more than two-fold the rate of the S-solketal conversion but even more that of R-solketal. Thus the immobilization of lipase had very positive effect on the process kinetics but decreased its enantioselectivity.
    Źródło:
    Chemical and Process Engineering; 2017, 38, 2; 209-215
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review on hierarchically microstructured monolithic reactors for high yield continuous production of fine chemicals
    Autorzy:
    Mrowiec-Białoń, J.
    Ciemięga, A.
    Maresz, K.
    Szymańska, K.
    Pudło, W.
    Jarzębski, A. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/184990.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microreactors
    in-flow synthesis
    process intensification
    nanostructured materials
    mikroreaktory
    synteza wewnątrzpłynna
    intensyfikacja procesu
    materiały nanostrukturalne
    Opis:
    Preparation and properties of hierarchically structured porous silica monoliths have been discussed from the viewpoint of their application as continuous microreactors for liquid-phase synthesis of fine chemical in multi kilogram scales. The results of recent topical papers published by two research teams of Institute of Chemical Engineering Polish Academy of Sciences (ICE) and Department of Chemical Engineering and Process Design, Chemical Faculty, Silesian University of Technology (SUT) have been analyzed to specify the governing traits of microreactors. It was concluded that even enhancement factor of 100 in activity, seen in enzyme catalyzed reactions, can be explained by a proportional reduction of its physical constraints, i.e. huge enhancement of external mass transfer and micromixing. It is induced by very chaotic flows of liquid in tens of thousands of waving connected channels of ca. 25–50 mm in diameter, present in the skeleton. The scale of enhancement in the caseof less active catalysts was smaller, but still large enough to consider the most practical applications.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 4; 367--375
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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