elisa实验报告
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elisa实验报告
篇一:eLIsA实验报告
experiment:eLIsA(enzyme-linkedImmunosorbentAssay)
Date:20XX.10.17
objectives
(1)LearneLIsAprinciple
(2)mastereLIsAtechnology,quantitativelydetermineantibodyandantigen.
experimentalprinciple
TheprincipleofeLIsAistomakeantigenorantibodycombinetothesurfaceofsomesolidphasecarrierandmaintainitsimmunocompetence,andthenmaketheantibodyorantigentocon
2 13 nectwithsomeenzymetobecomeenzymelabeledantigenorantibodyinwhichthe
immunocompetenceofbothantigenorantibodyandenzymeiskept.Inthedetermination,makethespecimentobetestedandenzymelinkedantigenreactwiththeantigenorantibodyonthesurfaceofsolidphasecarrierfollowingdifferenceprocedures.Throughwashing,antigen-antibodycomplexformedonsolidphasecarrierandothermaterialsareseparated.Finally,addingsubstrateintoenzymereaction,thesubstratewillbecatalyzedandbecomecoloredproduct.Theamountofproducthasdirectrelationwiththeamountofenzymeonthesolidphasecarrier,inotherwords,theamountofthematerialtobetestedinthespecimen.Quantitativeanalysiscanbeconductedbasedontheshadeofcolorreaction.Thisdeterminationhasaveryhighsensitivity.
eLIsAcanbedividedintomainlyfourtypes:thedirectmethod,indirectmethod,doubleantibodysandwichmethodandcompetitiveinhibitionmethod.Also,differentkindsofenzymeandsubstratecanbeusedineLIsA.
3 13 DoubleantibodymethodisakindofeLIsAtodetermineantigeninthespecimen.Inthismethod,antibodyiscoatedonthesurfaceofsolidphasecarrier.Antigeninthesamplebindswithantibodyonthesolidphase,whileothermaterialsarewashedaway.Thenaddenzymelinkedantibodytobindtheantigenwhichareboundonthesolidphase.Afterwashing,superfluousantibodyiswashedaway.Thesubstrateisthenaddedtoproducecolorandthequantitativetests
areconducted.
Inourexperiment,weadopteddoubleantibodysandwichmethodtodeterminemousetumornecrosisfactoralpha(TnFα)withanti-mouseTnFα.TheenzymeandsubstrateweusedareAvidin-hRpandTmbrespectively.
Reagentsandequipment
(1)equipments
40-wellreactionplatecoatedwithanti-mouseTnFα;liquidtransfergun(1ml,200μl);thermotank(37℃).
(2)Reagents
washingliquid(pbsT);sealingfluid;antigen(1000pg/ml)
4 13 ;anti-mouseTnFα;Tmb;Avidin-hRp;1mh2so4.
methodofoperation
(1)emptyoutthesolutionintheplateandcleantheplatewithwashingliquidforthreetimes.Topupeachholeandflaponabsorbentpapertocleanawaytheremainingliquidineachhole.Add200μlsealingfluidineachholeandputtheplatein37℃for30mins.
(2)washtheplatefor3times.Addreagentsin8holesaccordingtothetable:(numberrefertothe
(3)washtheplatefor3times,add100μlantibodyineachhole,puttheplatein37℃for30mins.
(4)washtheplatefor3times,add100μlenzymeineachhole,puttheplatein37℃for20mins.
(5)washtheplatefor5times,add100μlsubstrateineachhole,puttheplatein37℃for5mins.observethecolorationandtakeapicture.
(6)Add50μl1mh2so4ineachhole,observethecolorchangeandtakeapicture.
notes:
5 13 (1)Allreagentsshallbekeptindarkplaceat2-8℃.
(2)Liquidfeedingshallbelimitedatthebottomofholesinsteadofwall,withoutspillage.
(3)whencleaningtheplatemanually,donotspillouttheliquidintheholesincasethatthe
adjacentholespolluteeachothertocausefalsepositive.
(4)Theresultsareonlyvalidwithin30minsaftertheterminationoftest.
(5)experimentwastesshallbetreatedasinfectioussamples.
Discussion
(1)Fromtheresult,wecanseethegradientshadeofcoloration,whichmeanstheshadeofcolorationisinproportiontotheconcentrateofantigen.Theexactshadeofcolorationcanbedetectedbyspectrophotometer,andbecomparedwiththestandardcurvetogettheconcentratevalue.
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(2)everytimewhencleaningtheplate,thewashingliquidmustbecompletelyremoved.
Questions
(1)Analyzetheeffectofimpureenzymelabeledantibodytothetestingresultofantigen.(DoubleAntibodysandwichmethod)
Iftheimpuritycannotbebondwithantigen,ithasnoaffecttotheresult;iftheimpuritycanbebondwithantigen,itwillcausetheresultlowerthantherealconcentrate.
(2)comparethemostsuitabletestingobjectsofIFAandeLIsA.
IFAisusedinvivotolocateacertainantigen;whileeLIsAisusedinvitroconditiontodeterminethepresenceandconcentrateofacertainantigenorantibody.
篇二:eLIsA英文版实验报告
Test1.productionofantibody
[principle]
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1.Inthespecialhumoralimmuneresponse,antigencanstimulateimmunesystemtoproducespecificantibodies.eachantigenmoleculehasseveraldifferentantigenicdeterminants,soitcanberecognizedbydifferentbcellsandthenthesebcellswillproducedifferentspecificantibodiesthatcanbindwithepitopesspecifically.Theimmunityserumproducedbyusingantigentoimmuneanimalisamixtureofmanydifferentantibodies,calledpolyclonalantibody.Themostcommonmethodtoproducepolyclonalantibodyisusingpureantigentoimmuneanimal.
2.Thefactorsinfluencingproducingofantibodiesisrelatedtoantigenpurity,animal,amountofantigen,waysofinjection,timesofimmunity,etc.