Loop-mediated isothermal amplification(LAMP)is a novel nucleic acid amplification method.Compared with the widely utilized polymerase chain reaction(PCR),LAMP has higher speed and efficiency as well as lower requireme...Loop-mediated isothermal amplification(LAMP)is a novel nucleic acid amplification method.Compared with the widely utilized polymerase chain reaction(PCR),LAMP has higher speed and efficiency as well as lower requirement for system temperature control because the whole amplification process is isothermal and no efforts are needed to switch between different temperatures.In this paper,we designed and fabricated different kinds of polycarbonate(PC)microfluid chips,explored appropriate reaction condition for LAMP in microenvironment(1 nL→10μL),and developed a microfluidic isothermal amplification detection system.The DNA optimal amplification temperature is obtained;the starting time of exponential amplification of DNA is put forward farther.The optimal condition of DNA amplification in microenvironment,with a little reaction materials and early starting exponential amplification time of DNA are very important for clinic DNA detection and the application of Lab-on-a-Chip.展开更多
建立了食品中4种常见食源性致病菌的微流控芯片快速检测方法。根据副溶血弧菌的Vpara（16S-23SrDNAIGS）基因、沙门菌的invA基因、大肠杆菌O157：H7的rfbO157基因和志贺菌的ipaH基因序列设计了4对特异性引物，对上述致病菌进行四重PCR...建立了食品中4种常见食源性致病菌的微流控芯片快速检测方法。根据副溶血弧菌的Vpara（16S-23SrDNAIGS）基因、沙门菌的invA基因、大肠杆菌O157：H7的rfbO157基因和志贺菌的ipaH基因序列设计了4对特异性引物，对上述致病菌进行四重PCR扩增，采用微流控芯片-激光诱导荧光检测食品中4种常见致病菌的多重PCR扩增产物。优化了多重PCR扩增和微流控芯片电泳分离的实验条件。当芯片电泳的筛分介质HPMC-50浓度为2．2％、溴乙锭（EB）含量为3．75μmol／L、电场强度为120V／cm时，pUC Mix DNA Marker8和待测致病菌的多重PCR扩增产物可以实现基线分离，600S内即可完成上述4种致病菌的同时检测，迁移时间的日内相对标准偏差为0．74％～2．09％。本方法能够检出1×10^2cfu／mL的副溶血弧菌、沙门菌、大肠杆菌O157：H7和志贺菌。方法特异性高，所设计的引物在10种非目的菌株体系中均未见扩增的片段。将本法应用于食品中上述致病菌的测定，获得了满意的结果，为常见食源性致病菌的快速检测提供了一种新的可靠分析手段，对保障食品安全具有重要的现实意义。展开更多
基金supported by the National Foundation of High Technology of China(2006AA020701 and 2006AA020803)National Program on Key Basic Research Projects 973 of China(2006CB705700)+1 种基金the Nature Science Foundation of Zhejiang Province(2006C21G3210005)Tsinghua-Yuyuan Medicine Foundation(40000510B).
文摘Loop-mediated isothermal amplification(LAMP)is a novel nucleic acid amplification method.Compared with the widely utilized polymerase chain reaction(PCR),LAMP has higher speed and efficiency as well as lower requirement for system temperature control because the whole amplification process is isothermal and no efforts are needed to switch between different temperatures.In this paper,we designed and fabricated different kinds of polycarbonate(PC)microfluid chips,explored appropriate reaction condition for LAMP in microenvironment(1 nL→10μL),and developed a microfluidic isothermal amplification detection system.The DNA optimal amplification temperature is obtained;the starting time of exponential amplification of DNA is put forward farther.The optimal condition of DNA amplification in microenvironment,with a little reaction materials and early starting exponential amplification time of DNA are very important for clinic DNA detection and the application of Lab-on-a-Chip.
文摘建立了食品中4种常见食源性致病菌的微流控芯片快速检测方法。根据副溶血弧菌的Vpara（16S-23SrDNAIGS）基因、沙门菌的invA基因、大肠杆菌O157：H7的rfbO157基因和志贺菌的ipaH基因序列设计了4对特异性引物，对上述致病菌进行四重PCR扩增，采用微流控芯片-激光诱导荧光检测食品中4种常见致病菌的多重PCR扩增产物。优化了多重PCR扩增和微流控芯片电泳分离的实验条件。当芯片电泳的筛分介质HPMC-50浓度为2．2％、溴乙锭（EB）含量为3．75μmol／L、电场强度为120V／cm时，pUC Mix DNA Marker8和待测致病菌的多重PCR扩增产物可以实现基线分离，600S内即可完成上述4种致病菌的同时检测，迁移时间的日内相对标准偏差为0．74％～2．09％。本方法能够检出1×10^2cfu／mL的副溶血弧菌、沙门菌、大肠杆菌O157：H7和志贺菌。方法特异性高，所设计的引物在10种非目的菌株体系中均未见扩增的片段。将本法应用于食品中上述致病菌的测定，获得了满意的结果，为常见食源性致病菌的快速检测提供了一种新的可靠分析手段，对保障食品安全具有重要的现实意义。
