出版社：American Society for Biochemistry and Molecular Biology
摘要：Lipid alkyl radicals generated from polyunsaturated fatty acids via chemical or enzymatic H-ion have been a pathologically important target to quantify. In the present study, we established a novel method for the quantification of lipid alkyl radicals via nitroxyl radical spin-trapping. These labile lipid alkyl radicals were converted into nitroxyl radical-lipid alkyl radical adducts using 3-carbamoyl-2,2,5,5-tetramethyl-3-pyrroline- N -oxyl (CmΔP) (a partition coefficient between octanol and water is approximately 3) as a spin-trapping agent. The resulting CmΔP-lipid alkyl radical adducts were determined by HPLC with postcolumn online thermal decomposition, in which the adducts were degraded into nitroxyl radicals by heating at 100°C for 2 min. The resulting nitroxyl radicals were selectively and sensitively detected by electrochemical detection. With the present method, we, for the first time, determined the lipid alkyl radicals generated from linoleic acid, linolenic acid, and arachidonic acid via soybean lipoxygenase-1 or the radical initiator 2,2′-azobis(2,4-dimethyl-valeronitrile).
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