中国科技论文
中國科技論文
중국과기논문
Sciencepaper Online
2014年
12期
1385-1388
,共4页
分析化学%肿瘤细胞%纳米探针%信号放大%流动注射化学发光
分析化學%腫瘤細胞%納米探針%信號放大%流動註射化學髮光
분석화학%종류세포%납미탐침%신호방대%류동주사화학발광
analytical chemistry%tumor cells%nanoprobe%signal amplification%flow-injection chemiluminescence
将人 B 淋巴瘤细胞(Ramos)的核酸适体 TE02和钴纳米粒子(CoNPs)标记的 DNA 按1∶10的比例组装到金磁核壳结构 Au@Fe3 O4上,得到一种新型磁性生物条形码纳米探针(TE02/CoNPs/Au@Fe3 O4)。通过适体 TE02与96孔板上捕获探针的部分杂交,将所构建的磁性纳米探针固定到96孔板上。进一步利用 Ramos 细胞表面蛋白与适体 TE02的特异性识别,将TE02/CoNPs/Au@Fe3 O4纳米探针结合到 Ramos 细胞表面。磁性分离后,加入连接 DNA,通过链取代反应将 Ramos 细胞表面的 TE02/CoNPs/Au@Fe3 O4纳米探针解离下来,进而作为信号放大的中转站,通过稀硝酸溶解,释放大量二价钴离子(Co2+)。基于 Co2+催化鲁米诺-过氧化氢化学发光反应体系,采用流动注射进样技术,实现对 Ramos 细胞的高灵敏度、高选择性分析检测,线性范围为100~10000个 Ramos 细胞,检测限可达86个 Ramos 细胞,并成功应用于血清样品中 Ramos 细胞的分析测定。
將人 B 淋巴瘤細胞(Ramos)的覈痠適體 TE02和鈷納米粒子(CoNPs)標記的 DNA 按1∶10的比例組裝到金磁覈殼結構 Au@Fe3 O4上,得到一種新型磁性生物條形碼納米探針(TE02/CoNPs/Au@Fe3 O4)。通過適體 TE02與96孔闆上捕穫探針的部分雜交,將所構建的磁性納米探針固定到96孔闆上。進一步利用 Ramos 細胞錶麵蛋白與適體 TE02的特異性識彆,將TE02/CoNPs/Au@Fe3 O4納米探針結閤到 Ramos 細胞錶麵。磁性分離後,加入連接 DNA,通過鏈取代反應將 Ramos 細胞錶麵的 TE02/CoNPs/Au@Fe3 O4納米探針解離下來,進而作為信號放大的中轉站,通過稀硝痠溶解,釋放大量二價鈷離子(Co2+)。基于 Co2+催化魯米諾-過氧化氫化學髮光反應體繫,採用流動註射進樣技術,實現對 Ramos 細胞的高靈敏度、高選擇性分析檢測,線性範圍為100~10000箇 Ramos 細胞,檢測限可達86箇 Ramos 細胞,併成功應用于血清樣品中 Ramos 細胞的分析測定。
장인 B 림파류세포(Ramos)적핵산괄체 TE02화고납미입자(CoNPs)표기적 DNA 안1∶10적비례조장도금자핵각결구 Au@Fe3 O4상,득도일충신형자성생물조형마납미탐침(TE02/CoNPs/Au@Fe3 O4)。통과괄체 TE02여96공판상포획탐침적부분잡교,장소구건적자성납미탐침고정도96공판상。진일보이용 Ramos 세포표면단백여괄체 TE02적특이성식별,장TE02/CoNPs/Au@Fe3 O4납미탐침결합도 Ramos 세포표면。자성분리후,가입련접 DNA,통과련취대반응장 Ramos 세포표면적 TE02/CoNPs/Au@Fe3 O4납미탐침해리하래,진이작위신호방대적중전참,통과희초산용해,석방대량이개고리자(Co2+)。기우 Co2+최화로미낙-과양화경화학발광반응체계,채용류동주사진양기술,실현대 Ramos 세포적고령민도、고선택성분석검측,선성범위위100~10000개 Ramos 세포,검측한가체86개 Ramos 세포,병성공응용우혈청양품중 Ramos 세포적분석측정。
A novel magnetic bio-bar-code nanoprobe (TE02/CoNPs/Au@Fe3 O4 )was fabricated by attaching aptamer TE02 and Co nanoparticle (CoNP)-labeled DNA on core-shell conjugates Au@Fe3 O4 with a ratio of 1:10.The fabricated TE02/CoNPs/Au@Fe3 O4 composites were immobilized on 96-well plate by hybridizing aptamer to capture probe.Upon introduction of target Ramos cells,the TE02/CoNPs/Au@Fe3 O4 composites were attached on the surface of Ramos cells through specific cell-SELEX aptamer-target cell interaction.After magnetic separation and addition of linker DNA,the TE02/CoNPs/Au@Fe3 O4 composites were released from cell surface through strand displacement reaction (SDR),which further acted as amplification station followed by dissolving with HNO3 .As a result,a large amount of Co2+ was released.Based on Co2+-catalyzed luminol-H2 O2 flow-injec-tion chemiluminescence (FI-CL),this assay achieved highly sensitive and selective detection of Ramos cells with a linear range from 100 to 10 000 cells and limit of detection (LOD)of 86 cells.In addition,the proposed method has been successfully applied to Ramos cell analysis in serum samples.