Title
High sensitive and selective electrochemical biosensor: Label-free detection of human norovirus using affinity peptide as molecular binder
Author
Hye Jin Hwang, Myung Yi Ryu, Chan Young Park, Junki Ahn, Hyun Gyu Park, Changsun Choi, Sang-Do Ha, Tae Jung Park, Jong Pil Park
Year
2016
Journal
Biosensors and Bioelectronics
Abstract
Norovirus is known as the major cause of highly infection for gastrointestinal tracts. In this study, robust and highly sensitive biosensors for detecting human norovirus by employing a recognition affinity peptide-based electrochemical platform were described. A series of amino acid-substituted and cysteine-incorporated recognition peptides isolated from evolutionary phage display technique was chemically synthesized and immobilized to a gold sensor layer, the detection performance of the gold-immobilized synthetic peptide-based sensor system was assessed using QCM, CV and EIS. Using EIS, the limit of detection with Noro-1 as a molecular binder was found to be 99.8 nM for recombinant noroviral capsid proteins (rP2) and 7.8 copies/mL for human norovirus, thereby demonstrating a high degree of sensitivity for their corresponding targets. These results suggest that a biosensor which consists of affinity peptides as a molecular binder and miniaturized microdevices as diagnostic tool could be served as a new type of biosensing platform for point-of-care testing.
Instrument
J-715
Keywords
Circular dichroism, Secondary structure, Biochemistry