VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • Enzyme-catalyzed reactions in ionic liquids and in supercritical carbon dioxide [Elektronski vir]
    Knez, Željko ; Paljevac, Muzafera ; Leitgeb, Maja
    Ionic liquids are low melting point salts that represent an exciting new class of reaction solvents for catalysis. They have been successfully used for enzyme-catalyzed reactions. To ascertain the ... influence of ionic liquids on enzyme activity, two different ionic liquids, 1-butyl-3-methylimidazolium hexafluorophosphate and 1-butyl-3-methylimidazolium tetrafluoroborate, were synthesized and investigated as potential media for esterification of citronellol with lauric acid, catalyzed by commercial immobilized lipase B from Candida Antarctica (Novozym 435). Enzyme catalysed reactions were performed in a high pressure batch stirred reactor in supercritical CO2. The effect of different solvents (acetone, n-heptane, 2-methyl-2-butanol, ethyl methylketone, ionic liquids) temperature and pressure on the above mentioned reaction was studied. The highest citronellol laureate concentrations (3.95 mmol/g substrates) was obtained when ethyl methylketone was used as co-solvent after 1 hour of reaction performance. Optimum temperature and pressure for reaction performed in supercritical carbon dioxide/etyl methylketone medium were 60 °C and 100 bar. The stability and activity of immobilized lipase B in ionic liquids and in supercritical carbon dioxide was studied as well.
    Vir: Towards a new phase : proceedings [Elektronski vir] (8 str.)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2006
    Jezik - angleški
    COBISS.SI-ID - 10954774

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