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人淀粉樣前體蛋白(APP)ELISA試劑盒實(shí)驗(yàn)方法

本文由 上海華壹生物科技有限公司 整理匯編

2018-11-15 10:00 509閱讀次數(shù)

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人淀粉樣前體蛋白(APP)酶聯(lián)免疫分析(ELISA)試劑盒使用說明書實(shí)驗(yàn)?zāi)康模罕驹噭┖袃H供研究使用,用于測定人血清,血漿及相關(guān)液體樣本中淀粉樣前體蛋白(APP)含量。實(shí)驗(yàn)原理:本試劑盒應(yīng)用雙抗體夾心法測定標(biāo)本中人淀粉樣前體蛋白(APP)水平。用純化的人淀粉樣前體蛋白(APP)抗體包被微孔板,制成固相抗體,往包被單抗的微孔中依次加入淀粉樣前體蛋白(APP),再與HRP標(biāo)記的淀粉樣前體蛋白(APP)抗體結(jié)合,形成抗體-抗原-酶標(biāo)抗體復(fù)合物,經(jīng)過徹底洗滌后加底物TMB顯色。TMB在HRP酶的催化下轉(zhuǎn)化成藍(lán)色,并在酸的作用下轉(zhuǎn)化成Z終的黃色。顏色的深淺和樣品中的淀粉樣前體蛋白(APP)呈正相關(guān)。用酶標(biāo)儀在450nm波長下測定吸光度(OD值),通過標(biāo)準(zhǔn)曲線計(jì)算樣品中人淀粉樣前體蛋白(APP)濃度。樣本處理及要求:1.血清:室溫血液自然凝固10-20分鐘,離心20分鐘左右(2000-3000轉(zhuǎn)/分)。仔細(xì)收集上清,保存過程中如出現(xiàn)沉淀,應(yīng)再次離心。2.血漿:應(yīng)根據(jù)標(biāo)本的要求選擇EDTA或檸檬酸鈉作為抗凝劑,混合10-20分鐘后,離心20分鐘左右(2000-3000轉(zhuǎn)/分)。仔細(xì)收集上清,保存過程中如有沉淀形成,應(yīng)該再次離心。3.尿液:用無菌管收集,離心20分鐘左右(2000-3000轉(zhuǎn)/分)。仔細(xì)收集上清,保存過程中如有沉淀形成,應(yīng)再次離心。胸腹水、腦脊液參照實(shí)行。4.細(xì)胞培養(yǎng)上清:檢測分泌性的成份時(shí),用無菌管收集。離心20分鐘左右(2000-3000轉(zhuǎn)/分)。仔細(xì)收集上清。檢測細(xì)胞內(nèi)的成份時(shí),用PBS(PH7.2-7.4)稀釋細(xì)胞懸液,細(xì)胞濃度達(dá)到100萬/ml左右。通過反復(fù)凍融,以使細(xì)胞破壞并放出細(xì)胞內(nèi)成份。離心20分鐘左右(2000-3000轉(zhuǎn)/分)。仔細(xì)收集上清。保存過程中如有沉淀形成,應(yīng)再次離心。5.組織標(biāo)本:切割標(biāo)本后,稱取重量。加入一定量的PBS,PH7.4。用液氮迅速冷凍保存?zhèn)溆?。?biāo)本融化后仍然保持2-8℃的溫度。加入一定量的PBS(PH7.4),用手工或勻漿器將標(biāo)本勻漿充分。離心20分鐘左右(2000-3000轉(zhuǎn)/分)。仔細(xì)收集上清。分裝后一份待檢測,其余冷凍備用。6.標(biāo)本采集后盡早進(jìn)行提取,提取按相關(guān)文獻(xiàn)進(jìn)行,提取后應(yīng)盡快進(jìn)行實(shí)驗(yàn)。若不能馬上進(jìn)行試驗(yàn),可將標(biāo)本放于-20℃保存,但應(yīng)避免反復(fù)凍融.7.不能檢測含NaN3的樣品,因NaN3YZ辣根過氧化物酶的(HRP)活性。操作步驟:1.標(biāo)準(zhǔn)品的稀釋與加樣:在酶標(biāo)包被板上設(shè)標(biāo)準(zhǔn)品孔10孔,在**、第二孔中分別加標(biāo)準(zhǔn)品100μl,然后在**、第二孔中加標(biāo)準(zhǔn)品稀釋液50μl,混勻;然后從**孔、第二孔中各取100μl分別加到第三孔和第四孔,再在第三、第四孔分別加標(biāo)準(zhǔn)品稀釋液50μl,混勻;然后在第三孔和第四孔中先各取50μl棄掉,再各取50μl分別加到第五、第六孔中,再在第五、第六孔中分別加標(biāo)準(zhǔn)品稀釋液50ul,混勻;混勻后從第五、第六孔中各取50μl分別加到第七、第八孔中,再在第七、第八孔中分別加標(biāo)準(zhǔn)品稀釋液50μl,混勻后從第七、第八孔中分別取50μl加到第九、第十孔中,再在第九第十孔分別加標(biāo)準(zhǔn)品稀釋液50μl,混勻后從第九第十孔中各取50μl棄掉。(稀釋后各孔加樣量都為50μl,濃度分別為600ng/ml,400ng/ml,200ng/ml,100ng/ml,50ng/ml)。2.加樣:分別設(shè)空白孔(空白對照孔不加樣品及酶標(biāo)試劑,其余各步操作相同)、待測樣品孔。在酶標(biāo)包被板上待測樣品孔中先加樣品稀釋液40μl,然后再加待測樣品10μl(樣品Z終稀釋度為5倍)。加樣將樣品加于酶標(biāo)板孔底部,盡量不觸及孔壁,輕輕晃動(dòng)混勻。3.溫育:用封板膜封板后置37℃溫育30分鐘。4.配液:將30(48T的20倍)倍濃縮洗滌液用蒸餾水30(48T的20倍)倍稀釋后備用。5.洗滌:小心揭掉封板膜,棄去液體,甩干,每孔加滿洗滌液,靜置30秒后棄去,如此重復(fù)5次,拍干。6.加酶:每孔加入酶標(biāo)試劑50μl,空白孔除外。7.溫育:操作同3。8.洗滌:操作同5。9.顯色:每孔先加入顯色劑A50μl,再加入顯色劑B50μl,輕輕震蕩混勻,37℃避光顯色15分鐘.10.終止:每孔加終止液50μl,終止反應(yīng)(此時(shí)藍(lán)色立轉(zhuǎn)黃色)。11.測定:以空白空調(diào)零,450nm波長依序測量各孔的吸光度(OD值)。測定應(yīng)在加終止液后15分鐘以內(nèi)進(jìn)行。注意事項(xiàng):1.試劑盒從冷藏環(huán)境中取出應(yīng)在室溫平衡15-30分鐘后方可使用,酶標(biāo)包被板開封后如未用完,板條應(yīng)裝入密封袋中保存。2.濃洗滌液可能會(huì)有結(jié)晶析出,稀釋時(shí)可在水浴中加溫助溶,洗滌時(shí)不影響結(jié)果。3.各步加樣均應(yīng)使用加樣器,并經(jīng)常校對其準(zhǔn)確性,以避免試驗(yàn)誤差。一次加樣時(shí)間**控制在5分鐘內(nèi),如標(biāo)本數(shù)量多,推薦使用排槍加樣。4.請每次測定的同時(shí)做標(biāo)準(zhǔn)曲線,**做復(fù)孔。如標(biāo)本中待測物質(zhì)含量過高(樣本OD值大于標(biāo)準(zhǔn)品孔**孔的OD值),請先用樣品稀釋液稀釋一定倍數(shù)(n倍)后再測定,計(jì)算時(shí)請Z后乘以總稀釋倍數(shù)(×n×5)。5.封板膜只限一次性使用,以避免交叉污染。6.底物請避光保存。7.嚴(yán)格按照說明書的操作進(jìn)行,試驗(yàn)結(jié)果判定必須以酶標(biāo)儀讀數(shù)為準(zhǔn).8.所有樣品,洗滌液和各種廢棄物都應(yīng)按傳染物處理。9.本試劑不同批號組分不得混用。10.如與英文說明書有異,以英文說明書為準(zhǔn)。試劑盒性能:1.樣品線性回歸與預(yù)期濃度相關(guān)系數(shù)R值為0.92以上。2.批內(nèi)與批間應(yīng)分別小于9%和15%檢測范圍:30ng/ml-800ng/ml保存條件及有效期:1.試劑盒保存:2-8℃2.有效期:6個(gè)月FORRESEARCHUSEONLYHumanamyloidprecursorproteinDrugNamesGenericName:Humanamyloidprecursorprotein(APP)ELISAKit.PurposeThiskitallowsforthedeterminationofAPPconcentrationsinHumanserum,bloodplasma,andotherbiologicalfluids.PrincipleoftheassayThekitassayHumanAPPlevelinthesample,usePurifiedHumanAPPantibodytocoatmicrotiterplatewells,makesolid-phaseantibody,thenaddAPPtowells,CombinedAPPwhichWithHRPlabeled,becomeantibody-antigen-enzyme-antibodycomplex,afterwashingCompletely,AddTMBsubstratesolution,TMBsubstratebecomesbluecolorAtHRPenzyme-catalyzed,reactionisterminatedbytheadditionofasulphuricacidsolutionandthecolorchangeismeasuredspectrophotometricallyatawavelengthof450nm.TheconcentrationofAPPinthesamplesisthendeterminedbycomparingtheO.D.ofthesamplestothestandardcurve.Specimenrequirements1.serum-coagulationatroomtemperature10-20mins,centrifugation20-minatthespeedof2000-3000r.p.m.removesupernatant,Ifprecipitationappeared,Centrifugalagain.2.plasma-usesuitedEDTAorcitrateplasmaasananticoagulant,mix10-20mins,centrifugation20-minatthespeedof2000-3000r.p.m.removesupernatant,Ifprecipitationappeared,Centrifugalagain.3.Urine-collectsueasterilecontainer,centrifugation20-minatthespeedof2000-3000r.p.m.removesupernatant,Ifprecipitationappeared,Centrifugalagain.TheOperationofHydrothoraxandcerebrospinalfluidReferencetoit.4.cellculturesupernatant-detectsecretorycomponents,collectsueasterilecontainer,centrifugation20-minatthespeedof2000-3000r.p.m.removesupernatant,detectthecompositionofcells,DilutcellsuspensionwithPBS(PH7.2-7.4),Cellconcentrationreached1million/ml,repeatedfreeze-thawcycles,damagecellsandreleaseofintracellularcomponents,centrifugation20-minatthespeedof2000-3000r.p.m.removesupernatant,Ifprecipitationappeared,Centrifugalagain.5.Tissuesamples-Aftercuttingsamples,checktheweight,addPBS(PH7.2-7.4),Rapidlyfrozenwithliquidnitrogen,maintainsamplesat2-8℃aftermelting,addPBS(PH7.4),HomogenizedbyhandorGrinders,centrifugation20-minatthespeedof2000-3000r.p.m.removesupernatant.6.extractassoonaspossibleafterSpecimencollection,andaccordingtotherelevantliterature,and首ldbeexperimentassoonaspossibleaftertheextraction.Ifitcan’t,specimencanbekeptin-20℃topreserve,Avoidrepeatedfreeze-thawcycles.7.Can’tdetectthesamplewhichcontainNaN3,becauseNaN3inhibitsHRPactive.Assayprocedure1.DiluteandaddsampletoStandard:set10StandardwellsontheELISAplatescoated,addStandard100μltothefirstandthesecondwell,thenaddStandarddilution50μltothefirstandthesecondwell,mix;takeout100μlformthefirstandthesecondwellthenaddittothethirdandtheforthwellseparately.thenaddStandarddilution50μltothethirdandtheforthwell,mix;thentakeout50μlfromthethirdandtheforthwelldiscard,add50μltothefifthandthesixthwell,thenaddStandarddilution50μltothefifthandthesixthwell,mix;takeout50μlfromthefifthandthesixthwellandaddtotheseventhandtheeighthwell,thenaddStandarddilution50μltotheseventhandtheeighthwell,mix;takeout50μlfromtheseventhandtheeighthwellandaddtotheninthandthetenthwell,addStandarddilution50μltotheninthandthetenthwell,mix,takeout50μlfromtheninthandthetenthwelldiscard(addSample50μltoeachwellafterDiluting,(density:600ng/ml,400ng/ml,200ng/ml,100ng/ml,50ng/ml)2.addsample:Setblankwellsseparately(blankcomparisonwellsdon’taddsampleandHRP-Conjugatereagent,othereachstepoperationissame).testingsamplewell.addSampledilution40μltotestingsamplewell,thenaddtestingsample10μl(samplefinaldilutionis5-fold),addsampletowells,don’ttouchthewellwallasfaraspossible,andGentlymix.3.Incubate:AfterclosingplatewithClosureplatemembrane,incubatefor30minat37℃.4.Configurateliquid:30-fold(or20-fold)washsolutiondiluted30-fold(or20-fold)withdistilledwaterandreserve.5.washing:UncoverClosureplatemembrane,discardLiquid,drybyswing,addwashingbuffertoeverywell,stillfor30sthendrain,repeat5times,drybypat.6.addenzyme:AddHRP-Conjugatereagent50μltoeachwell,exceptblankwell.7.incubate:Operationwith3.8.washing:Operationwith5.9.color:AddChromogenSolutionA50ulandChromogenSolutionBtoeachwell,evadethelightpreservationfor15minat37℃10.Stopthereaction:AddStopSolution50μltoeachwell,Stopthereaction(thebluecolorchangetoyellowcolor).11.assay:takeblankwellaszero,Readabsorbanceat450nmafterAddingStopSolutionandwithin15min.Importantnotes1.Thekittakesoutfromtherefrigerationenvironment首ldbebalanced15-30minutesintheroomtemperature,ELISAplatescoatedifhasnotuseupafteropened,theplate首ldbestoredinSealedbag.2.washingbufferwillCrystallizationseparation,itcanbeheatedthewaterhelpsdissolvewhendilute.Washingdoesnotaffecttheresult.3.addSamplewithsamplerEachstep,Andproofreaditsaccuracyfrequently,avoidstheexperimentalerror.addsamplewithin5mins,ifthenumberofsampleismuch,recommendtouseVolley.4.ifthetestingmaterialcontentisexcessivelyhigher(ThesampleODisbiggerthanthefirststandardwell),pleasediluteSample(n-fold),Pleasediluenteandmultipliedbythedilutionfactor.(×n×5).5.Closureplatemembraneonlylimitsthedisposableuse,toavoidcross-contamination.6.Thesubstrateevadethelightpreservation.7.Pleaseaccordingtouseinstructionstrictly,Thetestresultdeterminationmusttakethemicrotiterplatereaderasastandard.8.Allsamples,washingbufferandeachkindofreject首ldaccordingtoinfectivematerialprocess.9.Donotmixreagentswiththosefromotherlots.Assayrange30ng/ml-800ng/mlStorageandvalidity1.Storage:2-8℃.2.validity:sixmonths.

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