Synthesis and xanthine oxidase inhibitory activity o

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• Synthesis and xanthine oxidase inhibitory activity o

  Synthesis and xanthine oxidase inhibitory activity o[详细]

  2024-09-28 01:18

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• Cytochrome Oxidase Activity

  CytochromeOxidaseActivityColorimetricAssayKitrev.04/13(Catalog#K287-100;100assays;Storeat-20°C)I.Introduction:CytochromecOxidase(EC1.9.3.1)orComplexIVisthefourthcomplexoftheElectronTransportChainlocatedinthemitochondrial(orbacterial)membrane.Itprovidesenergytothecellbycoup领electrontransportthroughtheCytochromecchainwiththeprocessofoxidativephosphorylation.ComplexIVcontains13differentsubunitsencodedbybothmitochondrialDNAandnuclearDNA.ItreceivesanelectronfromeachofthefourCytochromecmolecules,andtransfersittooneoxygenmolecule,convertingitintotwomoleculesofwater.Inthisprocess,italsobindstofourprotonmoleculesandtranslocatesthemacrossthemembranetoestablishelectrochemicalgradient,whichisutilizedforthesynthesisofATP.CytochromeOxidaseActivityAssayKitissimple,fastandhigh-throughputadaptable.Thisassaykitcanbeusedforpurifiedmitochondriaortissueextractscontainingmitochondria.TheactivityoftheenzymeisdeterminedcolorimetricallybyfollowingtheoxidationofreducedCytochromecasanabsorbancedecreaseat550nm.Theoverallreactionisasfollows:II.Application:FastandsimplemeasurementofCytochromeOxidaseenzymaticactivityin96-wellplateformat.Mitochondrialrespirationstudies,assemblyofthecomplexes,Mitochondriaoutermembraneintegrity.III.SampleType:PurifiedmitochondriaCells/TissueextractsIV.KitContents:V.UserSuppliedReagentsandEquipment:Multi-wellspectrophotometercapableofreadingabsorbance.Multi-channelpipetVI.StorageandHand领:Storekitat-20°C,protectedfromlight.WarmAssayBuffertoroomtemperaturebeforeuse.KeepEnzymeDilutionBufferonice.Readtheentireprotocolbeforeperformingtheassay.VII.ReagentPreparationandStorageConditions:DTT:Aliquotandstoreat-20°C.Thawjustbeforeuse.Cytochromec:Reconstituteeachvialwith1mlofCytochromeOxidaseAssayBuffer.Mixbyvortexingtodissolvecompletely.Add5<lofDTTsolution.Mixwellandwaitfor15min.atroomtemperature.Keepthisworkingsolutionatroomtemperature.Afterassayiscompleted,aliquotandsaverestoftheCytochromecsolutionat-20°C.ThisisnowreducedformofCytochromec.VIII.ComplexIVActivityAssayProtocol:1.EfficiencyofReductionofCytochromec:Ina96-wellplate,mix20<lofreducedCytochromecwith100<lofCytochromeOxidaseAssayBuffer.PrepareaparallelwellasblankwithonlyAssayBuffer.ReadODat550nm.TheODat550nmofreducedCytochromecisbetween0.2-0.6.Ifnot,add5<lofDTT/mlofreconstitutedCytochromecandwaitfor15min.toreadagaintheOD.2.SamplePreparation:Isolatemitochondriafromculturedcells,yeastortissuesbyusingMitochondria/CytosolFractionationKit(BVcat.#K256)orYeastMitochondriaIsolationKit(K259-50)orusecellortissuelysate(BVcat.#1067).Therecommendedrangeofpurifiedmitochondriais0.5-5<gandtissueextractis1-60<gperreaction.Dilutethetestsamples,ifneededbyEnzymeDilutionBuffer.3.Cytochromecpreparation:Prepare1:6dilutionofCytochromecbyusingpre-warmedCytochromeOxidaseAssayBuffer(onepartofCytochromecto5partsofbuffer)inaseparatetubedependingonthenumberofassaysamplesandcontrols.Prepare120<lofdilutedCytochromecperreaction.4.ComplexIVActivityAssay:Beforethereaction,setthespectrophotometerat550nmonkineticprogramfor30-45minutesat30secinterval.Addthetestsamples(approx.volume5-10<l)toeachwellofa96-wellplate.Fornegativecontrol(Blank),addequalvolumeofEnzymeDilutionBuffer.Add120<lofthedilutedCytochromecfromStep3toeachsampleandcontrolusingamultichannelpipette.ShakeandimmediatelyreadandrecorddecreaseinODoveraperiodof30-45min.Note:Therateofthereactionisrelativetoacontrolornormalsample.Therateiscalculatedinlinearrange.5.Calculations:CalculaterateofthereactionbycalculatingchangeinOD:OD/minbyusingthemaximumlinearrate.Theoxidation[详细]

  2018-11-08 10:00

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• 9028-79-9,半乳糖氧化酶,Galactose oxidase

  英文名称：GalactoseOxidasefromDactyliumdendroides；D-Galactose:oxygen6-oxidoreductaseCAS号：9028-79-9级别：Highpuritygrade分子量：68KD活力：≥30units/mgprotein活力定义：oneunitequalsachangeinabsorbanceat425nmof1.0perminuteat25℃,pH6.0usingaperosidase/o-tolidinecoupledassaywithgalactoseasthesubstrate**PH：7.0产品描述：Suppliedasapurifiedpowder,containingsodiumphosphateandcucroseasstablilizer.Oxdizesgalactoseandsomegalactosederivativesinbothfreeandpolymericforms.OxidationattheC6position.性状：粉末，是由一条含639个氨基酸基团的单聚肽链组成、以铜原子为活性ZX的酶。非蓝氧化酶的一种，是一种含铜不显蓝色的酶。与蓝铜氧化酶不一样，在600nm附近吸收系数很小，可用电子自旋共振（ESR）谱监测，其光谱特征与无机铜配位化合物相似用途：生化研究。催化氧化半乳糖，确定样品中半乳糖的含量保存：-20℃[详细]

  2018-10-23 10:31

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