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  • 1
    ISSN: 1573-6784
    Keywords: enzymatic polymerization ; lipase ; regioselectivity ; UV-MALDI-TOF-MS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Lipase B from Candida antarctica catalyzed regioselectively the polyesterification of glycerol and adipic acid. UV-MALDI-TOF-MS analysis of the polymers shows low molecular weight polyesters (1314-1716) with very narrow polydispersities (1.0–1.2).
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Biotechnology techniques 13 (1999), S. 453-457 
    ISSN: 1573-6784
    Keywords: enzymatic activity and stability ; lipase ; non-ionic surfactant ; reverse micelles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The stability of Candida rugosa lipase, which catalyzes the hydrolysis reaction of olive oil in AOT/isooctane reverse micelles, decreased with the increase of ω0 (defined as the molar ratio of water to surfactant) and Aerosol-OT concentration. The addition of a non-ionic cosurfactant, tetraethylene glycol dodecyl ether (C12E4), preserved enzymatic activity. The residual activity of the lipase was 53% after 24 h, while the enzyme completely lost its activity within 6 h in the absence of C12E4 addition. The stabilizing effect of C12E4 resulted in the increase of conversion. The enhancement of the activity and stability of lipase in reverse micelles by the addition of C12E4 may contribute to increase the rigidity of the micellar matrix stabilizing the enzyme structure.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-6784
    Keywords: immobilisation ; lipase ; membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Lipase (EC 3.1.1.3) from Candida rugosa was covalently immobilised on to cellulose, cellulose derivatives (cellulose acetate and cellulose phthalate) and cellulose composite membranes using activating agents such as sodium periodate or carbodiimide. Other non-cellulosic polymeric membranes (nylon, polyurethane, chitosan and hydroxyethyl methacrylate-co-methyl methacrylate) were also prepared and used for lipase immobilisation. The results obtained showed that the expressed activities are of the same order of magnitude for similar enzyme loadings when compared with those obtained from literature.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-6784
    Keywords: bioremediation ; hydrocarbons ; lipase ; oil ; soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The evaluation of soil lipase activity as a tool to monitor the decontamination of a freshly oil-polluted soil was tested in a laboratory study. An arable soil was experimentally contaminated with diesel oil at 5 mg hydrocarbons g−1 soil dry weight and incubated with and without fertilization (N-P-K) for 116 days at 20 °C. Lipase activity and counts of oil-degrading microorganisms were measured at regular time intervals, and the correlations with the levels of hydrocarbon concentrations in soil were investigated. The residual soil hydrocarbon concentration correlated significantly negatively with soil lipase activity and with the number of oil-degrading microorganisms, independent of fertilization. The induction of soil lipase activity is a valuable indicator of oil biodegradation in naturally attenuated (unfertilized) and bioremediated (fertilized) soils.
    Type of Medium: Electronic Resource
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