| Kitsize | 12x8 |
| Method | ELISA |
| Incubationtime | 1x2h,1x90min,1x30min |
| Standardrange | 25-1000pg/mL |
| Specimen/Volumes | 25µLCSF |
| Substrate/isotope | TMB450nm |
| RegulatoryStatus: | EU:CE |
IBLcomplementsits
dementiaMarkerrange
Furtherimprovementinthediagnosisofneurodegenerativediseases
Alongwithamyloid-βplaques,theformationoftaufibrilswithinthenervecells,particularlyinthecerebralcortexandnotablyinthelimbiclobe,isanotherpathologicalhallmarkofAlzheimer"sdisease.TheconcentrationofTauintheCSFisamarkerofneuronalcelldeath.InAlzheimer"sdisease,however,itincreasesonlyatalaterstageofthediseasewhenthepatientalreadydisplayssignificantcognitiveimpairment.Therefore,thedeterminationoftotaltauinCSFisimportantforthediagnosisofAlzheimer"sdiseaseinadditiontothedeterminationofamyloidβ-peptides.However,increasedtaulevelsarefoundinotherneurodegenerativediseasesaswell.Thesedisordersaregenerallyreferredtoastauopathiesandinclude,interalia,frontotemporallobardegeneration(FTLD),Pick"sdiseaseandcorticobasaldegeneration(CBD).TaulevelsaremarkedlyelevatedinCreutzfeldt-Jakobdisease.
ThehTAUtotalELISAfromAnalytikJena,manfuacturedbyAJRoboscreenanddistributedbyIBLInternational,wasoptimizedsothatitcanbeprocessedinparallelwiththeIBLAmyloid-βCSFELISA.
Asthegraphbelowshows,thehTAUtotalELISAfromAnalytikJena,manufacturedbyAJRoboscreenanddistributedbyIBLInternational,correlatessuperblywiththeINNOTEST®hTAU.

ClinicalvalidationoftheTAUtotalELISAwasperformedattheUniversityHospitalErlangenintheCSFLaboftheDepartmentofPsychiatryandPsychotherapy(Prof.Dr.Lewczuk).TaulevelsinthecerebrospinalfluidofpatientswithAlzheimer"sdiseaseandmildcognitiveimpairment(collectivelyAD(n=72)andcontrolsubjects(n=41))showhighlysignificantdifferencesbetweenthegroups.

Naturally,theTAUtotalELISA,justlikeourAmyloid-βCSFELISAs,displaysanexcellentanalyticalprecisionwithaninter-assayvarianceof<5% (Table 1), intra-assay variance of <5% (Table 2) and inter- LOT and operator variance of <6% (Table 3).
TAUtotalELISA Sample MW CV [pg/mL] [%] 1 182 4.7 2 315 4.4 3 343 4.3
TAUtotalELISA Sample MW CV [pg/mL] [%] 1 179 4.5 2 307 2.7 3 338 2.1
TAUtotalELISA Sample MW CV [pg/mL] [%] 1 180 5.7 2 311 4.4 3 342 5.6
AdditionaladvantagesofourELISAare:
- Dayassay(4hours)
- SameprotocolasAmyloid-βCSFELISAs
- Kitcontrols
- Itlendsitselftoautomation
GeneralInformation
In2010,thenumberofdementiapatientsworldwidewasestimatedat36million.Assuminganongoinglackofsufficientpreventiveandcurativetreatments,thisisexpectedtodoubleevery20years.Alzheimer’sDiseaseaccountsforroughly60‐70%ofalldementiacases.Bothprevalenceandincidenceincreasewithage.Prevalenceisaround1%
inthoseaged65‐69,andmorethan30%inthoseaged90orolder.
ThefirstcaseofAlzheimer’sDiseasewasdefinedandreportedin1907byGermanscientistDr.AloisAlzheimer.HedescribedtwohallmarksoftheDisease‐theplaquesandtanglesinthebrainsofAlzheimer’spatients.TheplaquesareformedbyAmyloid-betapeptidedepositsandthetanglesarecomposedofhyperphosphorylatedTauproteins.
Amyloidosisoccursasearlyasthepreclinicalstage.Thefirstcognitivedeficitscanmanifestthemselvesinthemildcognitiveimpairment(MCI)stage,whileinthedementiastagepatientsareunabletodoanyworkordailychores.
TheconcentrationofTAUinCSFisthereforerecognizedasaonebiomarkerindiagnosingAlzheimer’sDisease.
Moreover,anumberofindependentstudiesshowedthatcombiningTAU‐proteinandamyloid‐beta(1‐42)levelswillenhancespecificityandsensitivityofdiagnosisofAlzheimer’sDisease,whichisfurtherenhancedwhencombiningTAUlevelstoAmyloid-betaratiomeasurement.
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1. 直接法测定抗原 2.间接法测定抗体 3.双抗体夹心法测定抗原4. 竞争法测定抗原 厚百生物专业提供各类生化实验试剂、仪器、耗材,提供技术服务,满足您的实验室常规采购需求。厚百,让您更省心!
(1) 包被:用0.05M PH9.牰碳酸盐包被缓冲液将抗体稀释至蛋白质含量为1~10μg/ml。在每个聚苯乙烯板的反应孔中加0.1ml,4℃过夜。次日,弃去孔内溶液,用洗涤缓冲液洗3次,每次3分钟。(简称洗涤,下同)。
(2) 加样:加一定稀释的待检样品0.1ml于上述已包被之反应孔中,置37℃孵育1小时。然后洗涤。(同时做空白孔,阴性对照孔及阳性对照孔)。
(3) 加酶标抗体:于各反应孔中,加入新鲜稀释的酶标抗体(经滴定后的稀释度)0.1ml。37℃孵育0.5~1小时,洗涤。
(4) 加底物液显色:于各反应孔中加入临时配制的TMB底物溶液0.1ml,37℃10~30分钟。
(5) 终止反应:于各反应孔中加入2M硫酸0.05ml。
(6) 结果判定:可于白色背景上,直接用肉眼观察结果:反应孔内颜色越深,阳性程度越强,阴性反应为无色或极浅,依据所呈颜色的深浅,以“+”、“-”号表示。也可测O·D值:在ELISA检测仪上,于450nm(若以ABTS显色,则410nm)处,以空白对照孔调零后测各孔O·D值,若大于规定的阴性对照OD值的2.1倍,即为阳性。
间接法:
用包被缓冲液将已知抗原稀释至1~10μg/ml,每孔加0.1ml,4℃过夜。次日洗涤3次。加一定稀释的待检样品(未知抗体)0.1ml于上述已包被之反应孔中,置37℃孵育1小时,洗涤。(同时做空白、阴性及阳性孔对照)于反应孔中,加入新鲜稀释的酶标第二抗体(抗抗体)0.1ml,37℃孵育30-60分钟,洗涤,最后一遍用DDW洗涤。其余步骤同“双抗体夹心法”的4、5、6。
表面抗体是双抗原夹心法
E抗体和核心抗体是竞争抑制法或间接法
1. 包被:用0.05M PH9,碳酸盐包被缓冲液将抗体稀释至蛋白质含量为1~10μg/ml,在每个聚苯乙烯板的反应孔中加0.1ml,4℃过夜。次日,弃去孔内溶液,用洗涤缓冲液洗3次,每次3分钟。
2. 加样:加一定稀释的待检样品0.1ml于上述已包被之反应孔中,置37℃孵育1小时。然后洗涤。(同时做空白孔,阴性对照孔及阳性对照孔)。
3. 加酶标抗体:于各反应孔中,加入新鲜稀释的酶标抗体(经滴定后的稀释度)0.1ml,37℃孵育0.5~1小时,洗涤。
4. 加底物液显色:于各反应孔中加入临时配制的TMB底物溶液0.1ml,37℃10~30分钟。
5. 终止反应:于各反应孔中加入2M硫酸0.05ml。
6. 结果判定:可于白色背景上,直接用肉眼观察结果:反应孔内颜色越深,阳性程度越强,阴性反应为无色或极浅,依据所呈颜色的深浅,以“+”、“-”号表示。也可测OD值:在ELISA检测仪上,于450nm(若以ABTS显色,则410nm)处,以空白对照孔调零后测各孔OD值,若大于规定的阴性对照OD值的2.1倍,即为阳性。
方法二:用于检测未知抗体的间接法:
用包被缓冲液将已知抗原稀释至1~10μg/ml,每孔加0.1ml,4℃过夜。次日洗涤3次。加一定稀释的待检样品(未知抗体)0.1ml于上述已包被之反应孔中,置37℃孵育1小时,洗涤。(同时做空白、阴性及阳性孔对照)于反应孔中,加入新鲜稀释的酶标第二抗体(抗抗体)0.1ml,37℃孵育30~60分钟,洗涤,最后一遍用DDW洗涤。其余步骤同“双抗体夹心法”的4、5、6。

