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The blood samples were centrifuged and the plasma layer extractedand frozen at 2808C until analysis. Free F2-isoprostanes in plasma werequantified, after purification and derivatization, using GC/negative ionchemical ionization-MS with [2H4]8-iso-prostaglandin F2a as an internalstandard (20). Compounds were analyzed as trimethylsilyl etherderivatives by monitoring mass-to-charge ratios of 569 and 573 forendogenous F2-isoprostanes and the [2H4]8-iso-prostaglandin F2a inter-nal standard, respectively.
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