Sökning: "organic solvents"

Visar resultat 31 - 35 av 222 avhandlingar innehållade orden organic solvents.

  1. 31. Efficient Carbohydrate Synthesis By Intra- and Supramolecular Control

    Författare :Hai Dong; Olof Ramström; Ulf Nilsson; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Carbohydrate Chemistry; Supramolecular Control; Ambident Reactivity; Bioorganic chemistry; Bioorganisk kemi;

    Sammanfattning : The Lattrell-Dax method of nitrite-mediated substitution of carbohydrate triflates is an efficient method to generate structures of inverse configuration. In this study, the effects of the neighboring group on the Lattrell-Dax inversion were explored. LÄS MER

  3. 32. Radiosynthesis of Perfluoroalkyl Substances : Chemical analysis, uptake, distribution, and partitioning studies

    Författare :Maria Sundström; Åke Bergman; John Butenhoff; Stefan Nobel; Johan Eriksson; Christopher Lau; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; PFOS; PFOA; PFBS; miljökemi; Environmental Chemistry;

    Sammanfattning : Perfluoroalkyl substances (PFASs) are widely utilized manmade chemicals. Their properties have made them highly appreciated in a variety of industrial and consumer product applications, including fire-fighting foams, hydraulic fluids, as well as in cookware and food contact papers. LÄS MER

  4. 33. Enzymatic hydrolysis coupled to hot water extraction for determination of flavonoids in plants

    Författare :Sofia Lindahl; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; extraction; flavonoids; quercetin; biocatalysis; beta-glucosidase; sustainable chemistry; hyphenation; molecularly imprinted polymers; onion;

    Sammanfattning : The word sustainability is more and more frequently used within the field of chemistry and in many other fields. Green or sustainable chemistry was introduced during the 90 ́s as a field of chemistry where the environmental and health impacts of processes and products are evaluated and improved. LÄS MER

  5. 34. Synthesis and characterization of fluorescent stilbene-based probes targeting amyloid fibrils

    Författare :Jun Zhang; Peter Konradsson; Per Hammarström; Xiongyu Wu; Lin Li; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Alzheimer’s disease (AD) is characterized by two main protein aggregate hallmarks in the brain: extracellular deposition of the amyloid-β (Aβ) in senile plaques and intracellular neurofibrillary tangles (NFTs) consisting of hyperphosphorylated tau protein. The past decade has seen great progress in the development of imaging probes for the non-invasive detection of Aβ and tau aggregates. LÄS MER

  7. 35. Lipases as Biocatalysts in Organic Media. Influence of Enzyme Preparation and Reaction Conditions on Activity and Selectivity

    Författare :Mattias Persson; Avdelningen för klinisk kemi och farmakologi; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Biochemical technology; Bioteknik; Biotechnology; water activity; temperature; enantioselectivity; immobilisation; organic solvents; lyophilisation; Lipases; Accurel EP-100; Biokemisk teknik; Proteins; enzymology; Proteiner; enzymologi;

    Sammanfattning : The discovery that enzymes can function in organic solvents has broadened the scope of biocatalysis, making enzymes highly useful tools for organic chemists. The widespread use of enzymes as catalysts in organic solvents has, however, been limited by the low activity obtained for enzymes in organic solvents compared to aqueous solutions. LÄS MER