Sökning: "radical-trapping"

Hittade 5 avhandlingar innehållade ordet radical-trapping.

  1. 1. Regenerable Organochalcogen Antioxidants : An Explorative Study

    Författare :Jiajie Yan; Lars Engman; David J. Procter; Uppsala universitet; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  3. 2. Exploring Catalytic Tellurium-Based Antioxidants : Synthesis and Evaluation

    Författare :Jia-fei Poon; Lars Engman; John Murphy; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; antioxidant; tellurium; selenium; radical-trapping; chain-breaking; ROS; glutathione peroxidase; tocopherol; aromatic amine; oxidative stress;

    Sammanfattning : This thesis is concerned with the synthesis and evaluation of various tellurium-based chain-breaking antioxidants. The purpose is to find novel regenerable compounds with improved radical-trapping capacity.In the first part of this work, we explore the possibilities to incorporate tellurium into tocopherols and aromatic amines. LÄS MER

  4. 3. Manganese(salen) catalyzed epoxidation of alkenes

    Författare :Christian Linde; KTH; []
    Nyckelord :;

    Sammanfattning : This thesis deals the with steric and electronic effects inthe manganese(salen) catalyzed epoxidation of alkenes.Different methods were employed in the mechanisticinvestigations; molecular modelling, radical trapping, Hammettstudies on linear free-energy relationships and densityfunctional methods. LÄS MER

  5. 4. Limonene Hydroperoxides in Allergic Contact Dermatitis. Radical Formation, Sensitizing Capacity and Immunogenic Complex Formation

    Författare :Staffan Johansson; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; allergic contact dermatitis; contact allergy; immunogenic complex; limonene hydroperoxides; local lymph node assay; patch testing; radicals; sensitizing capacity; skin;

    Sammanfattning : Contact allergy to fragrance compounds is an increasing problem in the western countries today. R-Limonene is one of the most common fragrance compounds; it is used in hygiene products and cosmetics as well as in industrial products such as hand cleansers and degreasers. LÄS MER

  7. 5. Free radicals in cellular pathology : Mechanisms behind lipofucin formation in cultured myocardial cells

    Författare :Rasi Marzabadi Massoud; Linköpings universitet; []
    Nyckelord :MEDICINE; MEDICIN;

    Sammanfattning : Lipofuscin, or age pigment, may be defined as a yellowish-brown,autofluorescent, protein and lipid containing pigment that accumulates inthe lysosomal vacuome of a variety of post-mitotic cell types in man andanimals during aging. Lipofuscin is the end product of peroxidation,fragmentation and polymerization of proteins and lipids. LÄS MER