单抗竞争ELISA快速检测肠炎沙门氏菌方法的建立
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摘要
本研究从已建立的抗沙门氏菌单抗中筛选出适用于肠炎沙门氏菌
    ELISA快速检验的3—47—26单抗,采用筛选强阳性杂交瘤细胞株制备
    了高效价的3—47—26单抗。改进了用辣根过氧化物酶标记高效价单抗
    的方法,进行了HRP标记单抗的免疫生物学特性的鉴定。提取制备了肠
    炎沙门氏菌脂多糖,并对蛋白质和糖的含量进行了测定,提取液中蛋白
    质含量为0.17mg/ml,多糖含量为136.6ug/ml。确定了包被浓度和酶标抗
    体的工作浓度:HRP—3—47—26为1∶100;LPS的包被浓度为400ng/ml。
     试验中采用LPS与多聚赖氨酸的结合,解决了包被过程中的解吸附
    作用,增强了包被的稳定性,同时也减少了假阳性反应,优化了包被过
    程。建立了检测肠炎沙门氏菌的抗原竞争ELISA方法,利用样品中的
    LPS抑制酶标抗体与包被的LPS结合,以降低底物反应的颜色从而达到
    检测的目的。通过对210份肠炎沙门氏菌感染鸡泄殖腔棉拭子、羽毛和
    组织样品先筛选后鉴定的方法进行检测具有明显的抑制作用,通过与国
    标法对大量的样品检测结果比较表明,竞争ELISA方法的检出率为18.09%;
    检出阳性样品36份,国标法检出率为17.14%;两者符合率为97.14%。竞
    争ELISA敏感性和特异性分别为94.4%和97.7%。从而为肠炎沙门氏菌
    的检测提供了一种敏感、特异、快速的检测方法。
     通过以上研究工作,初步确定了肠炎沙门氏菌的ELISA检测程序,
    其方法的试验条件还有待进一步完善和标准化,以便为试剂盒的研制打
    下基础。
Establishment of A Monoclonal Antibody ased
     CLISA to Detect S. enteritidis
     Abstract:In this present study, a monoclonal antibody(McAb) 347-26 specific
     to 09,was used to establish competitive Enzyme-linked immunosorbed
     assays(C-ELISA) of detection for Salmonella enteritidis.
    
     A hybridomas cell strain 3-47-26 was screened and preparated the high
     valence monoclonal antibody. The linking method of McAb with HRP was
     improved and the specificity of HRP-3-47-26 was accredited. During the the
     experiment, Samonella enteritidis Lipopolysaccharidel(LPS) was preparated
     and was determined the ingredient pertain, 0.1 7mg/ml;Polysaccharide,
     136.6ug/ml. The concentration of coating of antigen LPS and HRP-3-47-26
     was determined HRP-3-47-26, 1:1 00;LPS,400ng/ml. Stable coating and
     minimal false positives were achieved by conjugating LPSto poly-L-lysine,
     which solved the desorption problem. S.enteritidis LPS in samples competed
     with S.enteritidis LPS coated on microtitre plate, and competition first
     reduced binding of McAb to the S.enteritidis LPS on the plate hence to
     reduce the chromogenic signal, which the aim of detection for sample. The
     C-ELISA was very specific and no cross reaction, and it was observed in
     detection sera induced by related Sammonella A-F, Compared with routine
     detective method for the detection of S.enteritidis, and the sensitivity and
     specificity of the C-ELISA were 98.7% and 99.3% respectively.
    
     A C-ELISA developed was attempted to provide a raped, sensitive and
     specific test for detecting S.enteritidis. As above study, The program of
     surveillance and standardized in order to make pave for ELISA kit for the
     detection of S.enteritidis from different specimens in this study.
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