Circulating oxidative stress in plasma proteins was assayed using OxiSelect Advanced Oxidative Protein Products (AOPP) kit (Cell Biolabs, Inc., San Diego, CA) according to our previously published protocol [60]. This assay measures the micromolar (µM) concentration of all oxidized proteins in the plasma relative to a known standard. Chloramine in the kit reacts with oxidized proteins to produce a color change, which can be read at 340 nm (nm).
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