title: Amplified electrochemical aptasensor for thrombin based on bio-barcode method.
abstract: In the present study, an electrochemical aptasensor for highly sensitive detection of thrombin was developed based on bio-barcode amplification assay. For this proposed aptasensor, capture DNA aptamerI was immobilized on the Au electrode. The functional Au nanoparticles (DNA-AuNPs) are loaded with barcode binding DNA and aptamerII. Through the specific recognition for thrombin, a sandwich format of Au/aptamerI/thrombin/DNA-AuNPs was fabricated. After hybridization with the PbSNPs-labeled barcode DNA, the assembled sensor was obtained. The concentration of thrombin was monitored based on the concentration of lead ions dissolved through differential pulse anodic stripping voltammetric (DPASV). Under optimum conditions, a detection limit of 6.2x10(-15) mol L(-1) (M) thrombin was achieved. In addition, the sensor exhibited excellent selectivity against other proteins.
authors.affiliation: Key Laboratory of Eco-chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
authors.forename: Xiaoru
authors.initials: X
authors.lastname: Zhang
authors.forename: Baoping
authors.initials: B
authors.lastname: Qi
authors.forename: Ying
authors.initials: Y
authors.lastname: Li
authors.forename: Shusheng
authors.initials: S
authors.lastname: Zhang
mesh_terms: D000818:Animals; D052157:Aptamers, Nucleotide / Q000737:chemistry*; D015374:Biosensing Techniques / Q000379:methods*; D004563:Electrochemistry / Q000379:methods*; D006046:Gold / Q000737:chemistry; D007854:Lead / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry; D012680:Sensitivity and Specificity; D013440:Sulfides / Q000737:chemistry; D013917:Thrombin / Q000032:analysis*
chemical_list: D052157:Aptamers, Nucleotide; D013440:Sulfides; C018391:lead sulfide; D007854:Lead; D006046:Gold; D013917:Thrombin