口蹄疫病毒核酸试纸条检测方法的建立

本研究通过核酸探针与免疫层析相结合的方法,建立了一种简单、敏感、特异的检测口蹄疫病毒的方法。试验利用RT-PCR方法获得口蹄疫病毒3D核苷酸片段,在引物中设计了灵敏度高、特异性好的核酸探针--生物素和地高辛,使扩增产物结合探针。利用胶体金的放大原理将链霉亲和素与金颗粒形成胶体金混合物,从而与RT-PCR产物中的生物素探针结合。硝酸纤维素膜上端标记生物素化山羊抗兔IgG作为指控条带,下端标记抗地高辛抗体以捕获RT-PCR产物中的地高辛探针。组装金标试纸条,检测RT-PCR产物,结果表明该核酸试纸条可以检测到 0.3×10^-3~3×10^-3 μg/μL,敏感性高于琼脂糖凝胶电泳,两种方法的符合率高,核酸试纸条检测方法是一种敏感性高、成本低且费时短的新型检测方法。该方法为口蹄疫病毒检测提供了一种新的思路。

Development of Nucleic Acid Lateral Flow Immunoassay Detection Method for Foot-and-mouth Disease Virus

In this article, through the combination of nucleic acid probes and immune chromatography, a simple, sensitive and specific detection system--nucleic acid lateral flow immunoassay (NALFIA) for amplifing foot-and-mouth disease virus (FMDV) 3D RT-PCR products was established.An ultrasensitive nucleic acid biosensor (NAB) based on streptavidin-labeled gold nanoparticles dual labels and lateral flow strip biosensor (LFSB) were used in this system.The biotinylated goat anti-rabbit IgG was marked to the NC membrane as the alleged strip and the anti-digoxin antibody was labeled to the NC membrane to capture the digoxin probe.After assemblying gold-labeled strip and detecting RT-PCR products, the detection limit of NALFIA was 0.3×10^-3 to 3×10^-3 μg/μL.The NALFIA was compared with agar gel electrophoresis analysis, the results showed that the sensitivity of NALFIA was higher than agar gel electrophoresis.There was an excellent agreement between the two methods.NALFIA was a method with high sensitive, low cost and short time.In conclusion, this method provided a good alternative to detect FMDV.