Search for dissertations about: "polyols"

Showing result 1 - 5 of 14 swedish dissertations containing the word polyols.

  2. 1. Microbial and enzymatic syntheses of polymer building blocks through selective transformations of polyols and furans

    Author : Mahmoud Sayed Ali Sayed; Bioteknik; []
    Keywords : Mycobacterium sp. MS1601; G. oxydans; oxidase; lipase; trimethylolpropane TMP ; 2; 2- bis hydroxymethyl butyric acid BHMB ; 5-hydroxymethyl furfural 5-HMF ; 5-hydroxymethyl-2-furan carboxylic acid HMFCA ; 2; 5-furandicarboxylic acid FDCA ; cyclic carbonate ; estrification; Biotransformation; polymer building blocks; product recovery; selective oxidation; bioprocess engneering; cell recycling; cell bleeding; DNA recombinant technology; in-silico analysis;

    Abstract : AbstractTransition from fossil- to bio-based economy is a critical step towards reduction of greenhouse gas emissions and climate change, and hence for achievement of sustainable communities and environment. In order to be fossil-free, the chemical and material industry is in need of carbon-neutral building blocks from renewable resources for the diverse array of products that are currently produced from olefins and aromatics. READ MORE

  4. 2. Synthesis of 11C-labelled monosaccharides

    Author : Mattias Ögren; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chemistry; Kemi; Chemistry; Kemi; organisk kemi; Organic Chemistry;

    Abstract : The synthesis of some 11C-labelled (tl/2=20.3 min) monosaccharides is presented. Terminal labelled alkenes were synthesized and selectively oxidized using asymmetric dihydroxylation (AD) and palladium(II)-promoted oxidation. The labelled polyols obtained after the AD were submitted to enzymatic oxidations. READ MORE

  5. 3. Transition Metal Catalysis for Selective Synthesis and Sustainable Chemistry

    Author : J. Johan Verendel; Pher G. Andersson; Reko Leino; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Catalysis; Transition metals; Asymmetric catalysis; Hydrogenation; Sustainable chemistry; Kemi med inriktning mot organisk kemi; Chemistry with specialization in Organic Chemistry;

    Abstract : This thesis discusses the preparation and use of transition-metal catalysts for selective organic chemical reactions. Specifically, two different matters have been studied; the asymmetric hydrogenation of carbon-carbon double bonds using N,P-ligated iridium catalysts and the metal-catalyzed transfer of small molecules from biomass to synthetic intermediates. READ MORE

  6. 4. Regioselective acylation of carbohydrates and polyester synthesis by lipase catalysis

    Author : Armando Córdova; KTH; []
    Keywords : ;

    Abstract : The lipases' high regio- and enantioselectivity, activity inorganic solvent and environmentally compatible reactionconditions have made lipase-catalysis based synthesis anattractive alternative to conventional synthetic methods inorganic chernistry and a new synthetic tool in polymerchemistry.The regioselective acylation of methy1 glycopyranosides wereinvestigated using several serine hydrolases. READ MORE

  7. 5. Managing irritable bowel syndrome - Dietary approaches and food intolerance

    Author : Sanna Nybacka; Göteborgs universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Irritable bowel syndrome; diet; FODMAP; food intolerance;

    Abstract : Irritable bowel syndrome (IBS) is a complex disorder where diet plays a pivotal role in symptom generation for many patients. The aim of this thesis was to explore how diet and self-perceived food intolerance relate to gastrointestinal (GI) symptoms among patients with IBS, and within different manifestations of IBS. READ MORE