Sökning: "cinnamaldehyde"

Visar resultat 1 - 5 av 6 avhandlingar innehållade ordet cinnamaldehyde.

  1. 1. Iodotrimethylsilane-Promoted Conjugate Addition of Organocopper Reagents, DDQ oxidation of Arylpropenes and Synthesis of 2-Arylcoumarans

    Författare :Tommy Iliefski; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; 2; DDQ; arylcoumaran; cinnamaldehyde; 6-dicyanobenzoquinone; iodotrimethylsilane; copper acetylides; 1; 3-dichloro-5; neolignan; 4-addition; arylpropene; TMSI; organocopper; conjugate addition;

    Sammanfattning : This thesis is divided into three parts: conjugate additions of organocopper reagents, DDQ oxidations of arylpropenes, and synthesis and steric assignment of 2-arylcoumarans. The iodotrimethylsilane(TMSI)-promoted conjugate addition of alkylcopper and copper acetylides to certain a,b-unsaturated carbonyl compounds is investigated. LÄS MER

  3. 2. 13C-Enriched Dehydrogenation Polymers Used for Studying Light-Induced Yellowing of Lignocellulosic Materials

    Författare :Jim Parkås; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; lignin model compounds; differentiating xylem; yellowing; Picea abies; 13C NMR spectroscopy; lignin; DHP; 13C-enrichment; solid state; spruce;

    Sammanfattning : This study deals with the use of selectively 13C-enriched dehydrogenation polymers (DHPs) as models of lignin in lignocellulosic materials for elucidating the reaction pathways involved in light-induced yellowing. Methods for the synthesis of coniferin, a precursor to lignin and DHP, selectively 13C-enriched in the aromatic ring (positions 1, 3, 4, and 5) have been developed. LÄS MER

  4. 3. Bioassay Development for Identification of Cyclooxygenase-2 Inhibitors of Natural Origin

    Författare :Therese Ringbom; Angelika Vollmar; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Pharmacognosy; Farmakognosi; Pharmacognosy; Farmakognosi; Pharmacognosy; farmakognosi;

    Sammanfattning : To examine cyclooxygenase-2 (COX-2) inhibitory effects of natural compounds and structurally related compounds, a radiochemical assay for measuring inhibition of COX-2 and COX-1 catalysed prostaglandin biosynthesis was optimised. That process resulted in the development of a reliable assay for finding COX-2 inhibitors in plants, and for investigating plant constituents pertaining to the inhibition of COX-2 and COX-1. LÄS MER

  5. 4. Ligniners reaktioner med alkalisk väteperoxid

    Författare :Roland Agnemo; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hydrogen Peroxide; Alkaline; Bleaching; Lignin Models;

    Sammanfattning : Under alkaline conditions hydrogen peroxide can be used either as a 1ignin-degrading or a 1ignin-preserving bleaching agent. If heavy metal ions are present and/or silicate is absent in the reaction medium, hydrogen peroxide decomposes via hydroxyl radicals and superoxide ions to oxygen and water. LÄS MER

  7. 5. Studies on the Effects of Plant and Food Constituents on Cyclooxygenase-2 : Aspects in Inflammation and Cancer

    Författare :Ulrika Huss; Pia Wuorela; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Pharmacognosy; Farmakognosi; Pharmacognosy; Farmakognosi;

    Sammanfattning : In inflammatory events, the cyclooxygenase-2 enzyme (COX-2) catalyses prostaglandin biosynthesis. This is a process, which could possibly be affected by natural compounds including those abundant in food. Two systems have been established to enable investigations of the effects of natural compounds on COX-2. LÄS MER