Xanthine OxidaseXanthineXanthine DehydrogenaseXanthinesAllopurinolOxypurinolMolybdenumHypoxanthineHypoxanthinesAldehyde OxidasePteridinesUric AcidKetone OxidoreductasesMilkSuperoxidesFree RadicalsPurinesTungstenHydroxidesSuperoxide DismutaseOxidation-ReductionElectron Spin Resonance SpectroscopyTungsten CompoundsTheobromineFlavin-Adenine DinucleotideCoenzymesMetalloproteinsHydroxyl RadicalUrate OxidaseHydrogen PeroxideReactive Oxygen SpeciesCattleDithioniteKineticsOxygenFree Radical ScavengersCatalaseNucleobase Transport ProteinsNADGuanine DeaminaseEnzyme InhibitorsPentosyltransferasesPurine-Pyrimidine Metabolism, Inborn ErrorsAldehyde OxidoreductasesPterinsLiverTheophyllineCyclic N-OxidesAdenosineReceptors, PurinergicOxidative StressNADPH OxidaseNitric OxideXanthopterinInosineAntioxidantsFlavinsVeillonellaAllantoinSulfurPurinergic P1 Receptor AntagonistsSpectrophotometryOxidantsRhodobacter capsulatus1-Methyl-3-isobutylxanthineUricosuric AgentsPurine NucleotidesCaffeineOxidoreductasesNitritesBenzaldehydesHyperuricemiaIron2-ChloroadenosineSodium NitriteNitratesGout SuppressantsRats, Sprague-Dawley2,6-DichloroindophenolGuanineDose-Response Relationship, DrugGlucose OxidaseReceptors, Purinergic P1AcetophenonesPurine NucleosidesIodidesLuminescent MeasurementsPentoxifyllineRats, Inbred StrainsLipid PeroxidationNADH Tetrazolium ReductaseAdenosine-5'-(N-ethylcarboxamide)Onium CompoundsChromatography, High Pressure Liquid