Sökning: "Candida antarctica Lipase A"

Visar resultat 6 - 10 av 58 avhandlingar innehållade orden Candida antarctica Lipase A.

  1. 6. Enantioselective biotransformations using engineered lipases from Candida antarctica

    Författare :Karin Engström; Jan-E. Bäckvall; Manfred T. Reetz; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; protein engineering; directed evolution; kinetic resolution; dynamic kinetic resolution; biotransformation; lipase; organisk kemi; Organic Chemistry;

    Sammanfattning : Enzymes are attractive catalysts in organic synthesis since they are efficient, selective and environmentally friendly. A large number of enzyme-catalyzed transformations have been described in the literature. LÄS MER

  3. 7. Lipase chemoselectivity - kinetics and applications

    Författare :Cecilia Hedfors; Karl Hult; Mats Martinelle; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Candida antarctica lipase B; Rhizomucor miehei lipase; active site titration; kinetics; chemoselectivity; thiol; alcohol; thiol-functionalized polyesters; Biochemistry; Biokemi;

    Sammanfattning :   A chemoselective catalyst is preferred in a chemical reaction where protecting groups otherwise are needed. The two lipases Candida antarctica lipase B and Rhizomucor miehei lipase showed large chemoselectivity ratios, defined as (kcat/KM)OH / (kcat/KM)SH, in a transacylation reaction with ethyl octanoate as acyl donor and hexanol or hexanethiol as acyl acceptor (paper I). LÄS MER

  4. 8. Lipase-Catalyzed Syntheses of Telechelic Polyesters

    Författare :Magnus Eriksson; Karl Hult; Mats Martinelle; Sergio Riva; KTH; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Candida antarctica lipase B; lipase-catalysis; polymerization; telechelic; functional polyesters; ring-opening polymerization; polycondensation.; Biochemistry; Biokemi;

    Sammanfattning : Telechelic polyesters have successfully been synthesized with lipase-catalyzed polymerization. The produced telechelics had a high degree of di­functionalization, high purity (requiring little or no workup) and controlled degree of polymerization. The syntheses were performed in one-pot one-step reaction systems. LÄS MER

  5. 9. Lipase and ω-Transaminase : Biocatalytic Investigations

    Författare :Maria Svedendahl; Per Berglund; Stefan Stefan Lutz; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Candida antarctica lipase B; enzyme catalysis; enzyme catalytic promiscuity; molecular modeling; ω-transaminase; Biochemistry; Biokemi;

    Sammanfattning : In a lipase investigation, Candida antarctica lipase B (CALB) are explored for enzyme catalytic promiscuity. Enzyme catalytic promiscuity is shown by enzymes catalyzing alternative catalytic transformations proceeding via different transition state structures than normal. LÄS MER

  7. 10. Determination of Fat-Soluble Vitamins in Foods Based on Supercritical Fluid Extraction

    Författare :Charlotta Turner; Kemiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Supercritical fluid extraction; Solvent collection; Solid phase trapping; SFE; Selectivity; Retinol; Milk powder; Lipase; Food; Enzymatic hydrolysis; Alcoholysis; Candida antarctica; Tocopherol; Vitamins; Analytical chemistry; Analytisk kemi;

    Sammanfattning : Sample clean-up methodologies based on supercritical fluid extraction (SFE) have been developed for determination of fat-soluble vitamins in foods. This thesis focuses on method development, stressing important issues concerning sample pre-treatment, extraction conditions and collection parameters. LÄS MER