Enzyme-guided plasmonic biosensor based on dual-functional nanohybrid for sensitive detection of thrombin.
Rapid and sensitive methodologies for the detection of protein are in urgent requirement for clinic diagnostics. Localized surface plasmon resonance (LSPR) of metal nanostructures has the potential to circumvent this problem due to its sensitive optical properties and strong electromagnetic near-field enhancements. In this work, an enzyme mediated plasmonic biosensor on the basis of a dual-functional nanohybrid was developed for the detection of thrombin. By utilizing LSPR-responsive nanohybrid and anaptamer-enzyme conjugated reporting probe, the sensing platform brings enhanced signal, stability as well as simplicity. Enzymatic reaction catalyzed the reduction of Au(3+) to Au° in situ, further leading to the rapid crystal growth of gold nanoparticles (AuNPs). The LSPR absorbance band and color changed company with the nanoparticle generation, which can be real-time monitoring by UV-visible spectrophotometer and naked eye. Nanohybrid constructed by gold and magnetic nanoparticles acts as a dual functional plasmonic unit, which not only plays the role of signal production, but also endows the sensor with the function of magnetic separation. Simultaneously, the introduction of enzyme effectively regulates the programming crystal growth of AuNPs. In addition, enzyme also serves as signal amplifier owing to its high catalysis efficiency. The response of the plasmonic sensor varies linearly with the logarithmic thrombin concentration up to 10nM with a limit of detection of 200 pM. The as-proposed strategy shows good analytical performance for thrombin determination. This simple, disposable method is promising in developing universal platforms for protein monitoring, drug discovery and point-of-care diagnostics.
['Yan|Jing|J|', 'Wang|Lida|L|', 'Tang|Longhua|L|', 'Lin|Lei|L|', 'Liu|Yang|Y|', 'Li|Jinghong|J|']
D015374:Biosensing Techniques D003124:Colorimetry D004867:Equipment Design D019544:Equipment Failure Analysis D005949:Glucose Oxidase D006046:Gold D006801:Humans D053768:Metal Nanoparticles D015203:Reproducibility of Results D012680:Sensitivity and Specificity D020349:Surface Plasmon Resonance D013917:Thrombin
Plasmonic biosensor Nanohybrid Thrombin Localized surface plasmon resonance (LSPR) Enzyme Gold nanoparticle Dual functional nanomaterial