A Nanostructured Piezoelectric Immunosensor for Detection of Human Cardiac Troponin T

Sensors

Rosana A. S. Fonseca¹  Joilson Ramos-Jesus¹  Lauro T. Kubota² 

[1] Laboratório de Engenharia Biomédica, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, Recife, Pernambuco 50670-901, Brazil; E-Mails:;Instituto de Química, Universidade Estadual de Campinas, Campinas 04118-080, SP, Brazil; E-Mail:

关键词: piezoelectric;    immunosensor;    gold nanoparticle;    cardiac troponin T;   

DOI  :  10.3390/s111110785

来源: mdpi

【 摘 要 】

A piezoelectric immunosensor based on gold nanoparticles (AuNPs) co-immobilized on a dithiol-modified surface is proposed for detection of human cardiac troponin T (TnT). Anti-human troponin T (anti-TnT) antibodies were covalently immobilized on the nanostructured electrode surface by thiol-aldehyde linkages. In a homogeneous bulk solution, TnT was captured by anti-TnT immobilized on the QCM electrode. Cyclic voltammetry studies were used to characterize the AuNPs layer on the electrode surface and the anti-TnT immobilization steps. The QCM-flow immunosensor exhibited good reliability, measuring concentrations of TnT from 0.003 to 0.5 ng mL⁻¹ in human serum with high linearity (r = 0.989; p < 0.01). The immunosensor exhibited a 7% coefficient of variation and 0.0015 ng mL⁻¹ limit of detection, indicating a high reproducibility and sensitivity. The proposed QCM nanostructured immunosensor is easy to use and has promising potential in the diagnosis of acute myocardial infarction due to its speed and high sensitivity.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.