S79株腮腺炎病毒制备纯化抗原用于诊断试剂的研究

以S79株腮腺炎病毒制备纯抗原,用于制备检测腮腺炎抗体(IgG)的ELISA试剂盒。将腮腺炎病毒S79株培养液用中空纤维超滤器进行浓缩,经PEG沉淀后,采用蔗糖密度梯度离心法纯化抗原;以纯化的S79株腮腺炎病毒为包被抗原,制备成ELISA腮腺炎病毒抗体(IgG)诊断试剂,并与SIGMA同类产品进行比较。结果显示,经纯化的S79株抗原的比活力为412.9HAU/mg,杂蛋白清除率为99.5%。应用纯化的S79株腮腺炎病毒抗原制备的ELISA试剂,与SIGMA试剂比较,敏感度为94.4%,特异度为91.7%,一致性为93.3%。结论,以纯化的S79株腮腺炎病毒为包被抗原,可用于大批量ELISA腮腺炎抗体诊断试剂盒的制备。     

肺炎支原体ELISA检测试剂盒的临床应用

目的评价肺炎支原体ELISA检测试剂盒在临床应用的效果。方法用肺炎支原体ELISA检测试剂盒检测呼吸道感染患儿的咽拭子标本,并以肺炎支原体快速检测培养基试剂做同步盲法对照试验,分析该试剂盒的准确性及批内、批间产品的稳定性。结果在100例呼吸道感染患儿咽拭子标本中,肺炎支原体ELISA检测法阳性率为38%,肺炎支原体快速检测培养基法阳性率为37%,两种方法阳性结果符合率为97%。同步盲法试验结果显示,肺炎支原体ELISA检测试剂盒批内、批间产品阳性结果的一致率均为100%。结论该试剂盒具有较好的准确度和特异性,并且操作简便、快速,临床可推广应用。     

百日咳抗体酶联检测试剂盒的研制及其应用

为了研制百日咳抗体酶联检测试剂盒以调查吉林省2~8岁儿童百日咳、白喉及破伤风抗体水平。采用百日咳菌液经硫酸铵盐析、PBS溶液浸提及蔗糖密度梯度离心提取的PT和FHA作为包被抗原,辣根过氧化物酶(HRP)标记羊抗人IgG,作为抗体制备ELISA试剂盒。并经敏感性、特异性、重复性试验考查该试剂盒质量。结果显示,试剂盒敏感性可达0.0036 IU/m l;重复性较好,CV<4%。试剂盒置于37℃3d敏感性无明显变化。吉林省2~8岁儿童白喉、破伤风的抗体水平较高,百日咳的抗体水平相对较低。此方法制备的百日咳抗体酶联检测试剂盒的质量符合要求,可应用于临床检验与流行病学监测。     

呼吸道合胞病毒Long株的培养及应用

建立可稳定收获高滴度RSVLong株病毒的培养方法 ,所获得的RSVLong株病毒液用于RSV抗体ELISA检测。RSVLong株病毒 33℃传至 4代后 ,病毒滴度升高 ,出现典型的细胞病变。以RSVLong株病毒液作抗原所建立的ELISA试剂盒能检测出RSV特异性抗体。     

Evaluation of an indigenous ELISA for diagnosis of Johne’s disease and its comparison with commercial kits

Country lacks sensitive and indigenous diagnostic kits for the screening of goats and sheep against Johne’s disease. Therefore an indigenous ELISA kit was developed using protoplasmic antigen from native Mycobacterium avium subspecies paratuberculosis ‘Bison Type’ strain of goat origin (Kit 1). In the present study, kit 1 and two commercial kits (kit 2 and 3) were evaluated with respect to ‘Gold Standard’ fecal culture in 71 animals (55 goats and 16 sheep). Kit 1 using indigenous antigen (protoplasmic antigen) was sensitive at very low concentration (0.1 μgm / well) as compared to purified commercial protoplasmic antigen (4 μgm / well) used in kit 2, in the Type 1 reactors (strong positive as positive). Screening of 71 animals by fecal culture detected 38.0% animals (goats-40.0%, sheep-31.2%) as positive (clinical shedders of bacilli) from these farm animals. Of the farm animals located at Central Institute for Research on Goats, herds of goat were endemic whereas, sheep flocks were comparatively resistant to Johne’s disease. The 29.5 and 61.9, 15.4 and 57.7 and 4.2 and 14.0% animals (goats and sheep) were in the category of sero-reactors type 1 and 2 of the ELISA kits 1, 2 and 3, respectively. In the type 1 sero-reactors, sensitivity and specificity of kit 1, 2 and 3 was 53.7 and 86.0, 17.8 and 86.0 and 3.5 and 94.7%, respectively. Indigenous ELISA test (kit 1) was significantly superior for the screening of goatherds and sheep flocks against JD as compared to commercial ELISA kits (Kit 2 and 3). In comparison to kit 2 and 3, kit 1 had highest sensitivity, comparable specificity and substantial to nearly perfect proportional agreement (Kappa Scores) with respect to ‘Gold standard’ fecal culture in goats and sheep. Disease being endemic in herds and flocks screened using ELISA kits, Type I sero-rectors had better correlation with fecal culture in comparison to Type II sero-reactors therefore, used for estimation of sero-prevalence. Newly developed Indigenous ELISA kit was simple, inexpensive, sensitive and reliable for screening of goats and sheep population against Johne’s disease. The study reports high prevalence of Johne’s disease in farm goatherds and sheep flocks, using sensitive tests (fecal culture and ELISA kit). Results of Type 1 reaction in kit 1 were optimally correlated with culture and were good for estimating the sero-prevalence. For controlling Johne’s disease in endemic herds initial removal of the animals in strong positive category (Tyep 1 reactors), may help to remove heavy shedders.     

Beacon公司微囊藻毒素检测试剂盒的性能评价

对一种进口微囊藻毒素ELISA试剂盒进行应用性能评价。用该试剂盒进行精密度实验,标准品添加回收实验,交叉反应实验以及样品检测比较实验。试剂盒的分析内检测精密度较高,分析间检测精密度偏低,加标回收率在73.5-97.8%之间,试剂盒抗体与MC-LR的交叉反应率很高,但与MC-RR、MC-LW、MC-LF等微囊藻毒素异构体交叉反应率偏低,在水样的测定中,试剂盒检测结果与本实验室方法检测结果基本一致。该试剂盒基本能够满足对水体中MC-LR的定性和定量检测要求。     

破伤风类毒素抗体酶联双抗原夹心法定量检测试剂的研制及评价

研制破伤风类毒素抗体酶联双抗原夹心法定量检测试剂,用于破伤风免疫血浆抗体效价检测。以精制破伤风类毒素经Sephacryl S-300柱层析纯化后作为包被抗原,用辣根过氧化物酶以改良过碘酸钠法标记精制破伤风类毒素作为酶标记抗原,以破伤风人免疫球蛋白国家标准品采用小鼠中和试验法标定试剂盒定量标准品,制备双抗原夹心法定量检测试剂;进行试剂盒检测范围、特异性、重复性、精密度及稳定性考核,并与小鼠中和试验法、琼脂双扩散法及国外破伤风类毒素抗体酶联试剂盒进行比较。结果显示,试剂盒的检测范围为10~150mIU/ml,灵敏度为10mIU/ml,线性好(r>0.996),板内孔间变异度小(CV<8%),特异性强(100%),重复性好(CV<13%),于37℃放置6天测定结果无明显差异,与小鼠中和试验法、英国Biding Site酶联试剂有良好的一致性。试验证明所研制的试剂盒适用于破伤风免疫血浆中的破伤风抗体效价定量检测。     

HIV-1 p24和SIV p27两种ELISA试剂盒检测SIV p27抗原的比较

目的由于检测SIV p27抗原试剂盒来源困难,有时不稳定,鉴于HIV-1 p24与SIVp27有较强的交叉抗原,本研究比较HIV-1 p24和SIV p27两种ELISA试剂盒检测SIV p27抗原得出的结果是否存在一定的相关性。方法 HIV-1 p24和SIV p27两种ELISA试剂盒定性和定量检测样品中SIV p27抗原,并对检测结果进行回归和相关分析。结果 HIV-1 p24和SIV p27两种ELISA试剂盒检测SIV p27抗原的灵敏度分别是150 pg/mL和62.5 pg/mL。两种试剂盒检测病毒液和血浆中SIV p27抗原的定性结果一致。定量结果的统计分析得出病毒液的直线回归决定系数R2=0.857,直线相关系数r=0.926,P〈0.01,直线正相关程度较高;血浆的直线回归决定系数R2=0.512,直线相关系数r=0.716,P〈0.05,直线正相关程度较低。结论 HIV-1 p24 ELISA试剂盒能够替代SIVp27 ELISA试剂盒定性检测病毒液和血浆中SIV p27抗原,但只能定量检测病毒液中SIV p27抗原。     

CTB与HCV抗原决定簇融合蛋白的抗原性及其在抗HCV ELISA试剂盒中的应用

系统研究了通过霍乱毒素B亚基与HCV的4个抗原决定簇进行基因融合所表达的12种融合蛋白中HCV抗原决定簇的反应原性,探索了以融合蛋白为抗原,进行抗-HCV检测的途径。结果表明,多数融合蛋白中HCV抗原决定簇均能与对应的HCV抗体结合。以融合蛋白95082为抗原研制的抗-HCV ELISA试剂检测122名献血员血清,结果与美国雅培公司抗-HCV ELISA试剂检测的结果完全一致,经药品生物制品检定所检定,其特异性、灵敏度、精密性及稳定性均达到国家卫生部抗-HCV ELISA试剂的暂行检定标准。     

Development of a Disperse Dye Immunoassay Technique for Detection of Antibodies against Neospora caninum in Cattle

In this study a disperse dye immunoassay method was standardized and evaluated for detection of antibodies against Neospora caninum in cattle. Sera from 150 cattle with a recent history of abortion were collected and tested by commercial ELISA kit and a standardized in-house dye immunoassay system. The positivity rate for the sera used in this study was 34.6% for the disperse dye immunoassay (DDIA) compared to 32% obtained by ELISA kit. This study showed no significant difference between DDIA and ELISA. The results indicated that the DDIA provide an economic, simple, rapid and robust test for detection of N. caninum infection in cattle.     

呼吸道合胞病毒IgG酶联检测试剂盒的研制

为了研制检测呼吸道合胞病毒IgG的酶联检测试剂盒,以呼吸道合胞病毒Long株病毒液作为包被抗原,HRP标记羊抗人IgG作为信号抗体,制备ELISA抗体检测试剂盒。结果表明建立的RSV酶联检测试剂盒敏感性与进口试剂盒接近,特异性达 95. 24%,重复性好,批内变异系数为 6. 35%,试剂盒置于 37℃ 0天与 7天检测结果无显著差异。成功制备了RSVIgG酶联检测试剂盒。     

鼠疫菌F1抗体/抗原酶联免疫诊断试剂盒的应用评价

目的对兰州生物制品研究所有限责任公司研制的鼠疫菌F1抗体酶联免疫诊断试剂盒和鼠疫菌F1抗原酶联免疫诊断试剂盒进行临床应用评价。方法采用双抗原/抗体夹心酶联免疫吸附试验(ELISA)、间接血球凝集试验(IHA)、胶体金免疫层析试验(GICA)3种方法的诊断试剂对比检测云南省地方病防治所中心实验室保藏的和现场采集的血清样品和脏器样品,对血清样品做鼠疫菌F1抗体检测,对脏器样品做鼠疫菌F1抗原检测。结果在358份血清样品中,ELISA试剂检出F1抗体阳性52份(14.52%),IHA试剂检出阳性37份(10.34%),GICA试剂检出阳性45份(12.57%)。ELISA与IHA试剂的符合率为95.23%,与GICA试剂的符合率为96.92%。经统计学χ2检验,ELISA试剂检出F1抗体阳性率高于IHA试剂(χ2=11.53,P=0.000 7),与GICA试剂检出的差异无统计学意义(χ2=3.27,P=0.070 4)。进一步分析滴度差值频数,ELISA试剂检测人血清的敏感性高于IHA试剂的样品占87.5%。在117份脏器样品中,3种试剂均检出F1抗原阳性15份(12.82%),符合率100%。滴度差值频数比较,ELISA试剂检测敏感性高于反向间接血球凝集试验(RIHA)试剂的样品为78.57%。结论兰州生物制品研究所有限责任公司研制的鼠疫菌F1抗体酶联免疫诊断试剂盒和鼠疫菌F1抗原酶联免疫诊断试剂盒性质特异,其敏感性优于IHA试剂盒和GICA试剂条,值得在鼠疫的监测和快速诊断中推广应用。     

Expression of Coat Protein of an Ordinary Strain of Potato virus Y in Escherichia coli and Production of Polyclonal Antibodies for Diagnosis

The coat protein gene (CP) of an ordinary strain of Potato virus Y (PVY^O) was cloned into the expression vector, pET‐28a(+). The insert was sequenced and analysis showed that the CP gene was in frame with intact N‐terminal 6X histidine tags. An approximately 35 kDa recombinant fusion protein was observed in inclusion bodies of induced Escherichia coli BL21 cells. This fusion protein was purified and used as antigen to raise polyclonal antibodies in rabbits. In Western blot and dot blot immuno‐binding assay (DIBA), both PVY^O‐CP IgG and PVY^O IgG strongly reacted with the recombinant CP. The PVY^O‐CP IgG could detect PVY^O in infected samples up to 1 : 3200 dilutions. A PVY^O‐CP ELISA kit was prepared and compared with conventional ELISA kit based on purified virus particles (PVY^O ELISA kit). The PVY^O‐CP ELISA kit consistently detected the PVY^O in DAS‐ELISA of field samples and was as effective as PVY^O ELISA kit.     

Asia I口蹄疫vp2蛋白单克隆抗体的制备及单抗竞争ELISA方法的建立

制备Asia I口蹄疫病毒vp2单克隆抗体(mAb)并建立了单抗竞争ELISA方法。用纯化的Asia I型口蹄疫病毒vp2重组蛋白免疫BALB/c小鼠, 将免疫小鼠的脾细胞与骨髓瘤SP2/0细胞融合, 采用间接ELISA和有限稀释法筛选杂交瘤细胞。分别用ELISA、Western blotting检测mAb腹水的效价及其特异性。筛选到杂交瘤细胞2株, 腹水效价均在100×29以上; 以纯化后的Asia I型口蹄疫病毒vp2重组蛋白作为抗原, 利用Asia I型口蹄疫病毒vp2单抗酶标物建立了竞争ELISA方法用来检测Asia I型口蹄疫抗体。临床应用表明, 该方法与UBI公司的口蹄疫全病毒抗体检测试剂盒总符合率达89.0%, 和荷兰赛迪公司的口蹄疫病毒LPB-ELISA抗体检测试剂盒总符合率达86.5%。     

Evaluation of a Dengue NS1 Antigen Detection Assay Sensitivity and Specificity for the Diagnosis of Acute Dengue Virus Infection

Background

Currently, no dengue NS1 detection kit has regulatory approval for the diagnosis of acute dengue fever. Here we report the sensitivity and specificity of the InBios DEN Detect NS1 ELISA using a panel of well characterized human acute fever serum specimens.

Methodology/Principal Findings

The InBios DENV Detect NS1 ELISA was tested using a panel composed of 334 serum specimens collected from acute febrile patients seeking care in a Bangkok hospital in 2010 and 2011. Of these patients, 314 were found to have acute dengue by either RT-PCR and/or anti-dengue IgM/IgG ELISA. Alongside the InBios NS1 ELISA kit, we compared the performance characteristics of the BioRad Platelia NS1 antigen kit. The InBios NS1 ELISA Ag kit had a higher overall sensitivity (86% vs 72.8%) but equal specificity (100%) compared to the BioRad Platelia kit. The serological status of the patient significantly influenced the outcome. In primary infections, the InBios NS1 kit demonstrated a higher sensitivity (98.8%) than in secondary infections (83.5%). We found significant variation in the sensitivity of the InBios NS1 ELISA kit depending on the serotype of the dengue virus and also found decreasing sensitivity the longer after the onset of illness, showing 100% sensitivity early during illness, but dropping below 50% by Day 7.

Conclusion/Significance

The InBios NS1 ELISA kit demonstrated high accuracy when compared to the initial clinical diagnosis with greater than 85% agreement when patients were clinically diagnosed with dengue illness. Results presented here suggest the accurate detection of circulating dengue NS1 by the InBios DENV Detect NS1 ELISA can provide clinicians with a useful tool for diagnosis of early dengue infections.     

乙型肝炎病毒表面抗原a、d、r亚型单克隆抗体的制备与应用

本文成功地建立了分泌抗乙型肝炎病毒表面抗原(抗-HBsAg)a,d、r3种亚型决定簇抗体的4株杂交瘤细胞。经一系列生化、免疫学鉴定,证明4株细胞所分泌的单克隆抗体(McAb)均具有各自的亚型特异性。反复克隆培养16周,并液氮冻存8个月后复苏,抗体的效价仍稳定不变。用纯化的McAb制备RPHA诊断试剂,检测了80例有乙型肝炎自觉症     

小鼠仙台病毒ELISA抗体检测规范化试剂盒的研制与应用

目的按照实验动物国家标准和农业部对于兽医诊断制品的要求研制小鼠仙台病毒抗体检测试剂盒,并在临床检测中分析其适用性。方法建立仙台病毒的种子批和BHK-21细胞的细胞库;标化仙台病毒生产工艺、抗原蛋白纯化工艺;优化ELISA反应板体系;标化质控血清。使用规范化的ELISA试剂盒对我单位672份送检血清样品进行检测,使用IFA和Western blot方法进行复检。结果病毒的种子批检验表明在-80℃保存半年以上毒力稳定;病毒生产和抗原纯化工艺的标准化提高了抗原生产的稳定性;对照体系的设定降低了环境等变量对于结果判定的影响。在对临床样本的检测过程中发现3种方法的灵敏度ELISA高于Western blot高于IFA。结论规范化的小鼠仙台病毒ELISA抗体检测试剂盒能对小鼠仙台病毒感染状况作出准确判断,具有一定的稳定性和结果可重复性。     

人巨细胞病毒IgG酶联免疫检测试剂盒的研制

为研制人巨细胞病毒 (HCMV)IgG酶联检测试剂盒 ,将HCMV接种人二倍体细胞 ,收获的病毒经纯化后用作包被抗原 ,辣根过氧化物酶 (HRP)标记羊抗人IgG为检测抗体 ,采用间接ELISA制备酶联免疫检测试剂盒并进行检定。该试剂盒操作简便、特异性强 ,稳定性、线性及精密性符合体外诊断试剂的要求。     

Clinical usefulness of urine-based enzyme-linked immunosorbent assay for detection of antibody to Helicobacter pylori: a collaborative study in nine medical institutions in Japan

Background. A urine-based enzyme-linked immunosorbent assay (ELISA) kit for detection of antibody to Helicobacter pylori has been developed in Japan. Urine samples can be obtained noninvasively and are easier and safer to handle than are serum samples. The aim of this study was to examine the clinical usefulness of this urine-based ELISA kit.
Materials and Methods. A pair of random, single-void urine and serum samples was collected from each of 1,061 subjects, including 238 patients with gastroduodenal disease. The sensitivity and specificity of the urine-based ELISA was compared with those of three commercially available serum-based ELISA kits. For those patients with gastroduodenal disease, the urine- and serum-based ELISA results were also compared with those for other diagnostic methods using endoscopic biopsy specimens, such as culture, histology, and rapid urease tests.
Results. Based on the three serum-based ELISA results, the sensitivity, specificity, and accuracy of the urine-based ELISA were 97.7%, 95.6%, and 96.8%, respectively. On the basis of the biopsy test results, the sensitivity (96.2%), specificity (78.9%), and accuracy (91.0%) of the urine-based ELISA were almost equivalent or superior to all three serum-based ELISAs tested. In addition, 10 of the 12 false-positive cases for urine-based ELISA were confirmed to be true positives for antibodies to H. pylori by Western blot analysis and inhibition ELISA.
Conclusions. The urine-based ELISA (URINELISA H. pylori Antibody) is very accurate and should be useful as an alternative to serum-based ELISAs for screening of H. pylori infection.     

脑红蛋白ELISA检测试剂盒的研发与应用

目的:利用ELISA技术研发一种灵敏、快速检测人血清中脑红蛋白(Ngb)含量的检测试剂盒,并探讨其在正常人血清样本检测中的应用。方法:采用热诱导的原核表达体系获得重组人源脑红蛋白(rhNgb),通过凝胶过滤和阴离子交换层析等制备rhNgb纯品;将适量rhNgb纯品免疫动物获得抗rhNgb单克隆抗体和多克隆抗体;用双抗体夹心ELISA技术制备rhNgb-ELISA检测试剂盒;用该试剂盒对410例正常人血清中Ngb的含量进行检测,其中包括1.5岁以下婴儿血清55例、19～70岁成人血清355例。结果:用制备的rhNgb-ELISA试剂盒检测发现Ngb在正常人血清中的分布与年龄存在明显的相关性,表现为"两头高、中间低"的趋势,婴儿和老年人血清中Ngb的含量分别为1.6708±0.4945和2.1962±0.6703μmol/L,而中年人血清中Ngb的含量为0.3622±0.0716μmol/L。结论:采用双抗夹心ELISA技术并结合严格的质量控制,研发了高效灵敏的rhNgb-ELISA检测试剂盒,并初步获得了正常人血清中Ngb的含量分布情况,为临床缺血及缺氧性脑损伤等相关疾病的辅助诊断治疗提供了参考信息。