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Comparison of nitrite/nitrate concentration in human plasma and serum samples measured by the enzymatic batch Griess assay, ion-pairing HPLC and ion-trap GC–MS: The importance of a correct removal of proteins in the Griess assay

BiochemistryNitrite/nitrate ConcentrationIon-pairing HplcMedicineBioanalysisMass SpectrometryReactive Nitrogen SpecieHuman PlasmaAnalytical ChemistryClinical ChemistryPharmacologyNitrosative StressChromatography