Graphene Fluorescence Resonance Energy Transfer Aptasensor for the Thrombin Detection

被引:793
作者
Chang, Haixin [1 ]
Tang, Longhua [1 ]
Wang, Ying [1 ]
Jiang, Jianhui [2 ]
Li, Jinghong [1 ]
机构
[1] Tsinghua Univ, Dept Chem, Key Lab Bioorgan Phosphorus Chem & Chem Biol, Beijing 100084, Peoples R China
[2] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China
基金
中国国家自然科学基金;
关键词
APTAMER-BASED SENSORS; CARBON NANOTUBES; SENSING PLATFORM; DNA; NANOPARTICLES; BINDING; FILMS; ARRAY; ASSAY; GOLD;
D O I
10.1021/ac9025384
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Combining nanomaterials and biomolecule recognition units is promising in developing novel clinic diagnostic and protein analysis techniques. In this work, a highly sensitive and specific fluorescence resonance energy transfer (FRET) aptasensor for thrombin detection is developed based on the dye labeled aptamer assembled graphene. Due to the noncovalent assembly between aptamer and graphene, fluorescence quenching of the dye takes place because of FRET. The addition of thrombin leads to the fluorescence recovery due to the formation of quadruplex-thrombin complexes which have weak affinity to graphene and keep the dyes away from graphene surface. Because of the high fluorescence quenching efficiency, unique structure, and electronic properties of graphene, the graphene aptasensor exhibits extraordinarily high sensitivity and excellent specificity in both buffer and blood serum. A detection limit as low as 31.3 pM is obtained based on the graphene FRET aptasensor, which is two orders magnitude lower than those of fluorescent sensors based on carbon nanotubes. The excellent performance of FRET aptasensor based on graphene will also be ascribed to the unique structure and electronic properties of graphene.
引用
收藏
页码:2341 / 2346
页数:6
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