Jürg Löliger

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Experimental proof is provided for interactions between radicals of vitamin E/vitamin C as generated by air-oxidized lipids (liquid fraction of subcutaneous chicken fat). Using ESR spectroscopy, hydrogen atom exchange is shown to take place between vitamin C and the radical of vitamin E. Sequential consumption of these two vitamins in oxidized lipid, first(More)
Antioxidant reactions of mixtures of vitamin E, vitamin C and phospholipids in autoxidizing lipids at 90 degrees C have been studied by ESR spectroscopy. When the phospholipid contained a tertiary amine (e.g. phosphatidylcholine), the vitamin C and the vitamin E radicals were successively observed as these two vitamins were sequentially oxidised during(More)
The reactions between protein-bound amino acids and oxidizing lipid were investigated in a whey protein-methyl linolenate (C18:3)-water model system. The extent of fat oxidation was followed by measuring oxygen uptake, hydroperoxide formation and hydrocarbon (ethane and pentane) formation. Significant losses occurred with lysine (up to 71%), tryptophan (up(More)
The formation of free radicals during the reaction of anthralin analogues with peroxidizing polyunsaturated lipids was monitored by ESR spectroscopy. The biological effect of the different compounds was assessed by their ability to inhibit respiration of cultured human keratinocytes. C(10)-monosubstituted analogues of anthralin exhibited a strong(More)
Peroxidizing lipids were used to induce the formation of antioxidant radicals. It has been shown by electron spin resonance (ESR) spectroscopy and simulation of the first derivative ESR spectra that the radicals formed by this method are the already known tocopheroxyl radicals. dl-alpha-Tocopheroxyl radicals were formed in relatively high concentration but(More)
The role of molecular organization in heated aqueous dispersions of egg phosphatidylcholine (PC) and egg phosphatidylethanolamine (PE) was studied with respect to the formation of key odorants. Evidence was found for the crucial role of self-assembly structures adopted by phospholipid molecules on the quantitative composition of volatile constituents. The(More)
A set of analytical methods was used for the characterization of the oxidative degradation of dehydrated potato flakes. Headspace gas analysis for straight chain hydrocarbon (Ethane-hexane) and for oxygen was used to directly follow the oxidation. Bleaching was followed by quantitatively determining the carotenoid concentration. Analytical results obtained(More)
Reactions of anthralin with peroxidizing lipids were investigated. Using ESR spectroscopy and quantitative HPLC analysis radical species and decomposition products respectively were analysed in the reaction mixture as a function of time. Directly after mixing anthralin with peroxidized lipids, the 1,8-dihydroxy-9-anthron-10-yl radicals (primary radical) and(More)
Radical reactions of anthralin and its metabolites with skin have been studied by ESR spectroscopy. The influence of compounds which are known to suppress inflammation are described. The ESR spectra recorded during the reaction of anthralin with skin were essentially composed of one broad line centered at g = 2.0030. Similar but much weaker spectra were(More)
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