Search for dissertations about: "enantiomeric composition"

Showing result 1 - 5 of 8 swedish dissertations containing the words enantiomeric composition.

  2. 1. Primary and secondary organics in biogenic atmospheric aerosol : The chiral study of 2-methyltetrols from method development to application

    Author : Nélida Jocelyn Donají Karlsson; Kevin Noone; Sandro Fuzzi; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; atmospheric organic aerosols; 2-methyltetrols; isoprene; chiral GC-MS; enantiomeric composition; Applied Environmental Science; tillämpad miljövetenskap;

    Abstract : Distinguishing between the primary and secondary origin of the organic components in atmospheric aerosols is one of the key parameters in assessing the relevance and role of different chemical species in the overall chemistry of the atmosphere. Currently available methods used in field measurements are not able to fully discriminate between the primary or secondary origin of compounds detected in atmospheric aerosols. READ MORE

  4. 2. Chemodiversity and Functions of Monoterpene Hydrocarbons in Conifers

    Author : Monika Persson; KTH; []
    Keywords : Conifers; Picea abies; Pinus sylvestris; Pinus yunnanensis; Pinus armandii; monoterpenes; enantiomeric composition; correlations; chemotaxonomy; two-dimensional gas chromatography; induced stress; Tomicus piniperda; Leptographium wingfieldii;

    Abstract : .... READ MORE

  5. 3. Enantiomeric separations by capillary electrophoresis in pharmaceutical analysis

    Author : Cari Elise Sänger-van de Griend; Uppsala universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Pharmaceutical chemistry; Farmaceutisk kemi; Pharmaceutical chemistry; Farmaceutisk kemi; Analytical Pharmaceutical Chemistry; Analytisk farmaceutisk kemi;

    Abstract : The chiral capillary electrophoresis mechanism is studied by evaluating the enantiomeric separations of a series of local anaesthetic analogues, the sixteen different optical isomers of a tetrapeptide and a series of glycyl, alanyl and leucyl dipeptides. The usefulness of mobility difference plots is appraised and important method parameters, such as the selection of the chiral selector, the chiral selector concentration, the chiral selector purity, the pH and the composition of the electrophoresis solution, are identified and discussed, bearing method robustness in mind. READ MORE

  6. 4. Chiral building blocks for synthesis of pine sawfly sex pheromones Enantioselective Lipase Catalysed Acylations and Esterifications of Primary Alcohols and Acids and Synthesis of the Sex Pheromone of the Pine Sawfly Microdiprion pallipes

    Author : Ba-Vu Nguyen; KTH; []
    Keywords : lipase; Pseudomonas cepacia; Candida rugosa; enantioselective; enantiomeric ratio; primary 2-methylalcohol; substituted-methylcarboxylic acid; pine sawfly; Microdiprion pallipes; sex pheromone; 3; 7; 11-trimethyl-2-tridecanol; stereoisomer;

    Abstract : This thesis describes the development of new methods for thepreparation of enantiomerically pure methyl branched alkylcompounds and their use as building blocks in the synthesis ofstereoisomerically pure pheromones of pine sawflies.The high regioselectivity, enantioselectivity and activityof lipases in organic solvent in conjunction withenvironmentally compatible reaction conditions have madelipase-catalysed synthesis an attractive alternative toconventional synthetic methods in organic chemistry. READ MORE

  7. 5. Possibilities to Utilize Species from the Mozambican Forest Biomass for the Production of Essential Oils : Study of Eucalyptus and Pinus Species and Application of Citronellal as Raw Material for Flavour Chemistry

    Author : Felisberto P. Pagula; KTH; []
    Keywords : Eucalyptus species; essential oil composition; citronellal; hydroxycitronellal;

    Abstract : This thesis deals partly with the isolation and chemicalanalysis of essential oils from selected Eucalyptus and Pinusspecies grown in Mozambique, and partly with the synthesis ofmore valuable compounds from citronellal isolated fromEucalyptus citriodora Hook oil.More than 60 constituents in the volatile oils wereidentified by gas chromatography and gas chromatography-massspectrometry by comparison with authentic substances andliterature data. READ MORE