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- W2001243241 abstract "This study was designed to evaluate the effect of high concentrations of melatonin on the peroxidation of human low density lipoproteins (LDLs) initiated by O(2)(*-) and ethanol-derived peroxyl radicals (RO(2)(*)) from water gamma radiolysis in the presence of ethanol. LDL (3 g/l; total LDL concentration) was oxidized in the absence of melatonin or in its presence at three concentrations (50 x 10(-6), 100 x 10(-6) or 250 x 10(-6) mol/l) in ethanol. Radiolytic yields (i.e. number of mole consumed or produced per Joule) of the markers of lipid peroxidation were determined (i.e. decrease in the endogenous antioxidants alpha-tocopherol and beta-carotene, formation of conjugated dienes and of thiobarbituric acid-reactive substances [TBARS]). Melatonin decreased the yields of lipid peroxidation products and delayed the onset of the propagation phase for conjugated dienes and TBARS in a concentration-dependent manner. Nevertheless, melatonin did not protect endogenous alpha-tocopherol against peroxyl-induced oxidation (probably due to a lower scavenging capacity than that of alpha-tocopherol towards peroxyl radicals), but delayed the consumption of LDL endogenous beta-carotene and decreased its rate of disappearance. The effect of melatonin seemed to be the highest for a melatonin concentration of 250 x 10(-6) mol/l." @default.
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- W2001243241 date "2003-04-01" @default.
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- W2001243241 title "Protection of endogenous β-carotene in LDL oxidized by oxygen free radicals in the presence of supraphysiological concentrations of melatonin" @default.
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- W2001243241 doi "https://doi.org/10.1179/135100003125001413" @default.
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