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]

7 13

1.Inthespecialhumoralimmuneresponse,antigencanstimulateimmunesystemtoproducespecificantibodies.eachantigenmoleculehasseveraldifferentantigenicdeterminants,soitcanberecognizedbydifferentbcellsandthenthesebcellswillproducedifferentspecificantibodiesthatcanbindwithepitopesspecifically.Theimmunityserumproducedbyusingantigentoimmuneanimalisamixtureofmanydifferentantibodies,calledpolyclonalantibody.Themostcommonmethodtoproducepolyclonalantibodyisusingpureantigentoimmuneanimal.

2.Thefactorsinfluencingproducingofantibodiesisrelatedtoantigenpurity,animal,amountofantigen,waysofinjection,timesofimmunity,etc.