Search for dissertations about: "autoxidation"

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

  1. 1. Allergenic Oxidation Products from Fragrance Terpenes. Chemical Analysis and Determination of Sensitizing Potency

    Author : Johanna Rudbäck; Göteborgs universitet.; Gothenburg University.; [2013]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Autoxidation; Contact allergy; Essential oils; Fragrances; Hydroperoxides; Ionization techniques; Mass spectrometry; Prehapten; Sensitization; Skin; Structure-activity relationships; Terpenes;

    Abstract : The ubiquitous presence of fragrance compounds in consumer products has resulted in a high frequency of contact allergy to fragrances in the population. For prevention purposes and according to EU regulations, cosmetics must be labeled when containing the most prominent fragrance allergens in concentrations exceeding 0. READ MORE

  2. 2. Regenerable Organochalcogen Antioxidants An Explorative Study

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Jiajie Yan; Lars Engman; David J. Procter; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; autoxidation; antioxidant; selenium; tellurium; regenerable; multifunctional; radical-trapping; hydroperoxide-decomposing; co-antioxidant; Chemistry with specialization in Organic Chemistry; Kemi med inriktning mot organisk kemi;

    Abstract : Antioxidants are widely used to protect organic materials from damages caused by autoxidation, an oxidation process that occurs under normal aerobic conditions. In this thesis, novel multifunctional organoselenium and organotellurium antioxidants were designed, synthesized, and evaluated in search for compounds with better radical-trapping capacity, regenerability, and hydroperoxide-decomposing ability. READ MORE

  3. 3. Sesquiterpenoid unsaturated dialdehydes - Structural properties that affect reactivity and bioactivity

    University dissertation from Department of Organic Chemistry, Lund University

    Author : Mikael Jonassohn; [1996]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; mutagenic; autoxidation; dopamine D1 receptor; vanilloid receptor; structure-activity relationships; triacetic acid lactone; amino acids; reactivity; merulidial; warburganal; polygodial; Unsaturated dialdehydes; isovelleral; antimicrobial; cytotoxic; Polymer technology; biopolymers; Polymerteknik;

    Abstract : The natural unsaturated 1,4-dialdehydes warburganal (6), polygodial (14), isovelleral (55) and merulidial (56a) and their corresponding unconjugated aldehyde isomers (121), (15), (108) and (109a) were prepared, and their bioactivity and reactivity towards various nucleophiles were investigated. New synthetic routes to prepare (-)-6 and its isomer (+)-121 from (-)-14, and (+)-109a from (-)-56a, have been developed. READ MORE

  4. 4. Clinical and experimental studies on oxidized fragrance terpenes as contact allergens

    University dissertation from Department of Organic Chemistry, Lund University

    Author : Johanna Bråred Christensson; Göteborgs universitet.; Gothenburg University.; [2009]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; autoxidation; contact allergy; limonene; linalool; colophonium; limonene-1-hydroperoxide; limonene-2-hydroperoxide; 15-hydroperoxyabietic acid; 15-HPA; terpenes; local lymph node assay; LLNA; Freunds complete adjuvant test; FCAT; patch testing; laser Doppler imaging; skin irritation; visual reading;

    Abstract : The work presented in this thesis aims to improve the possibilities for diagnosing contact allergy to oxidized limonene and linalool and to, in patients, study contact allergy from structurally closely related hydroperoxides with regard to their specificity, potency and cross-reactivity. The fragrance terpenes limonene (from citrus oil) and linalool (from lavender oil) are widely used in household and industrial products. READ MORE

  5. 5. Epoxides as Contact Allergens - Formation, Sensitising Potency and Structure-Activity Relationships

    University dissertation from Department of Organic Chemistry, Lund University

    Author : Ida Belogorcev Niklasson; Göteborgs universitet.; Gothenburg University.; [2013]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Allergic contact dermatitis; Autoxidation; Bioactivation; Cinnamic alcohol; Diglycidyl ether of bisphenol A DGEBA ; Epoxide; Epoxy resin; Local lymph node assay; Polymerisation; Peptide reactivity; Prehapten; Prohapten; Sensitisation; Skin; Structure-Activity Relationship; Thermogravimetric Analysis;

    Abstract : Chemicals in our environment with which we have repeated skin contact can cause skin sensitisation (contact allergy). To trigger an immune response a compound (hapten) must be able to penetrate the skin, where it needs to be reactive enough to bind to proteins and form immunogenic complexes that are recognised as foreign. READ MORE