Ultraviolet A-Induced Peroxidation of Phosphatidylcholine in Unilamellar Liposomes
Copyright policy )Ultraviolet A-Induced Peroxidation of Phosphatidylcholine in Unilamellar Liposomes
Unilamellar liposomes of 1-palmitoyl-2-linoleoyl-3-sn-phosphatidylcholine (PLPC) were exposed to ultraviolet A (UVA) light at 37 degrees C. The UVA-induced PLPC peroxidation was inhibited by free radical scavengers, while singlet oxygen quenchers showed slight inhibition. When pre-existing hydroperoxides were reduced, UVA irradiation could not initiate the lipid peroxidation. The UVA-induced reaction of PLPC hydroperoxides with alpha-tocopherol produced addition products. The results indicate that UVA irradiation might dissociate hydroperoxides to alkoxyl and peroxyl radicals which stimulate lipid peroxidation.
- Gifu University Japan
Organophosphorus Compounds, Ultraviolet Rays, Phosphatidylcholines, Hydrogen Peroxide, Lipid Peroxidation, Chromatography, High Pressure Liquid, Unilamellar Liposomes
Organophosphorus Compounds, Ultraviolet Rays, Phosphatidylcholines, Hydrogen Peroxide, Lipid Peroxidation, Chromatography, High Pressure Liquid, Unilamellar Liposomes
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