Ultrasensitive detection of thrombin using surface plasmon resonance and quartz crystal microbalance sensors by aptamer-based rolling circle amplification and nanoparticle signal enhancement

2014 ◽  
Vol 50 (12) ◽  
pp. 1481-1484 ◽  
Author(s):  
Peng He ◽  
Lijun Liu ◽  
Wenping Qiao ◽  
Shusheng Zhang
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Quartz Crystal Microbalance ◽  
Plasmon Resonance ◽  
Quartz Crystal ◽  
Rolling Circle Amplification ◽  
Ultrasensitive Detection ◽  
Sandwich Assay ◽  
Rolling Circle ◽  
First Time

The SPR and QCM aptasensors combined with RCA, AuNP enhancement, and sandwich assay format have been applied to detect the human α-thrombin for the first time.

SURFACE PLASMON RESONANCE SPECTROSCOPY AND QUARTZ CRYSTAL MICROBALANCE STUDY OF PROTEIN-DNA INTERACTIONS IN HORMONE RECEPTOR BIOLOGY

COSMOS ◽  
2009 ◽  
Vol 05 (01) ◽  
pp. 79-95
Author(s):  
XIAODI SU
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Quartz Crystal Microbalance ◽  
Conformational Changes ◽  
Plasmon Resonance ◽  
Quartz Crystal ◽  
Resonance Spectroscopy ◽  
Dna Interactions ◽  
Protein Dna Interactions

Surface plasmon resonance (SPR) spectroscopy and quartz crystal microbalance (QCM) are surface sensitive analytical techniques capable of real-time monitoring of biomolecular interactions. In this article we review our past work on the use of these two techniques for studying protein–DNA interactions, exemplified with estrogen receptors (ER) and their response elements (ERE). Various assay schemes have been developed for a comprehensive characterization of ER–ERE interactions in terms of sequence specificity, binding affinity, stoichiometry, ligand effects on binding dynamics and conformational changes in the proteins and DNA. These are all important characteristics underlining the mechanism of ER-mediated gene transcription. With these studies we have made the following demonstrations to describe the advantages of these two techniques, namely (i) SPR technique is superior and more versatile than conventional (electrophoretic mobility shift assay) EMSA for studying protein-DNA interactions; (ii) QCM is an alternative tool for studying conformational changes in protein–DNA complexes and (iii) combinational SPR and QCM analysis provides additional characterization of biomolecular films, e.g. film thickness, water content, and conformation rigidity etc.

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