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'Chem ilum inescence' in keywords
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1986 (1)
1985 (1)
1Author    Joachim Stauff, G.Erhard StärkRequires cookie*
 Title    Chemilumineszenz von Photoprodukten polyzyklischer aromatischer Kohlenwasserstoffe und deren Carbonylverbindungen Chemiluminescence of Photoproducts of Polycyclic Aromatic H ydrocarbons and their Carbonyl Compounds  
 Abstract    During photooxidation of polycyclic arom atic hydrocarbons (PA H) products can be form ed which develop chemiluminescence on treatm ent with bases. Flash photolysis experim ents show that this is the case only after previous form ation of cation radicals, e.g. in the presence of CC14 as solvent or of e-acceptors in aprotic solvents. These radicals react with oxygen to peroxy-radicals which can combine to several kinds of peroxides. Primary and secondary peroxides are the sources of chemilum inescent activity. C hemilum inescent peroxides can also be obtained by irradiation of PA H carbonyl com pounds in protic solvents under nitrogen. It is assumed that two excited CO groups combine exceptionally with their O -atom s thus creating a peroxide bond. 24 arom atic aldehydes, ketones, dicarboxylic acid anhydrides and coum arines develop chemiluminescence after illumination with w avelengths > 320 nm with intensities varying 4 magnitudes of order. The sensitivity of the photochem ilum inescent method is sufficient to detect amounts of PA H and their CO derivatives in the ppb to ppm range. 
  Reference    (Z. Naturforsch. 41b, 113—121 [1986]; eingegangen am 15. Juli 1985) 
  Published    1986 
  Keywords    Chem ilum inescence, Photooxidation Photoreduction, Polyaromatic H ydrocarbons, Carbonyl C om pounds 
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 TEI-XML for    default:Reihe_B/41/ZNB-1986-41b-0113.pdf 
 Identifier    ZNB-1986-41b-0113 
 Volume    41 
2Author    Krzysztof Lichszteld, Zygmunt Machoy, Anna StępińskaRequires cookie*
 Title    Chemiluminescence in the Coupled Oxidation of Lecithin and Ascorbate  
 Abstract    Chem ilum inescence (CL) that appears during oxidation o f lecithin and ascorbate has been studied. A simple system consisting only o f purified lecithin, which has one double bond, and ascorbate as a physiological reductant with a low redox potential, was used. The CL spectrum o f lecithin contain a strong band lying in the near infrared, and three bands at 20 900 cm -1, 17 700 cm -1 and 15 800 cm -1, being characteristic o f singlet m olecular oxygen (1O a). The effect o f * 0 2 quenchers on both autooxidation processes has also been investigated. The obtained results indicate that the main emitter is the *0 2. An addition o f ascorbate to the system lecithin plus buffer causes a decrease o f CL intensity. That is a result o f stronger quenching properties o f ascorbate and not due to efficiency o f the generation o f *0 2 . 
  Reference    Z. Naturforsch. 40c, 223—226 (1985); received Septem ber 13 1984 
  Published    1985 
  Keywords    Lipid Peroxidation, Singlet Oxygen, Chem ilum inescence, Lecithin, Ascorbic Acid 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0223.pdf 
 Identifier    ZNC-1985-40c-0223 
 Volume    40