Akademska digitalna zbirka SLovenije - logo
VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • Enzymatic incorporation of fatty acid into triacylglycerols of sunflower oil resulting in structural lipids [Elektronski vir]
    Bratfalean, Dorina ; Leitgeb, Maja ; Knez, Željko
    The paper describes the results, obtained by enzymatic incorporation of free fatty acid (FFA) into triacylglycerols of sunflower oil. The enzymatic reaction was the transesterification reaction at ... normal pressure operation (NPO) at different temperatures, as well as in supercritical carbon dioxide (SC CO2) using a batch reactor. Transesterification process conditions (temperature, FFA concentration, stirrer speed, substrate molar ratio and incubation time) were optimised, performing experiments in NPO and, for comparison, in SC CO2. The immobilised form of the lipase (immobilized lipase from Rhizomucor miehei) was used. The enzymatic system could be described by a set of parallel and consecutive chemical reactions. A temperature of 353 K, stirring rate of 400 rpm, euricic acid concentration 0.05 g/cm3, enzyme concentration 0.25 g/cm3 and incubation time of 6h were found to be the optimum reaction conditions. Under these conditions a maximum FFA conversion of 81.15 % was attained in NPO and 68.15 % in SC CO2 at 10 MPa. Optimising all these parameters could modify the lipids structure by acidolysis processes and oils with predictable composition could be obtained. An overview of our future research on various types of enzymatic reactors in supercritical fluids, which can further give data on the productivity and the economy of the process, is also given.
    Vir: Reactions, materials and natural products processing [Elektronski vir] ([6] str.)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2008
    Jezik - angleški
    COBISS.SI-ID - 12427286

Vnos na polico