期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 19, 期 23, 页码 7452-7460出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201203224
关键词
aptamers; circular amplification; lysozyme; nanoparticles; Raman spectroscopy
资金
- National Natural Science Foundation of China [21025523, 21275086]
- National Basic Research Program of China [2010CB732404]
- Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT)
An ultrasensitive surface enhanced Raman scattering (SERS) method has been designed to selectively and sensitively detect lysozyme. The gold chip as the detection substrate, the aptamer-based target-triggering cascade multiple cycle amplification, and gold nanoparticles (AuNPs) bio-barcode Raman probe enhancement on the gold substrate are employed to enhance the SERS signals. The cascade amplification process consists of the nicking enzyme signaling amplification (NESA), the strand displacement amplification (SDA), and the circular-hairpin-assisted exponential amplification reaction (HA-EXPAR). With the involvement of an aptamer-based probe, two amplification reaction templates, and a Raman probe, the whole circle amplification process is triggered by the target recognition of lysozyme. The products of the upstream cycle (NESA) could act as the DNA trigger of the downstream cycle (SDA and circular HA-EXPAR) to generate further signal amplification, resulting in the immobility of abundant AuNPs Raman probes on the gold substrate. Hot spots are produced between the Raman probe and the gold film, leading to significant SERS enhancement. This detection method exhibits excellent specificity and sensitivity towards lysozyme with a detection limit of 1.0x1015M. Moreover, the practical determination of lysozyme in human serum demonstrates the feasibility of this SERS approach in the analysis of a variety of biological specimens.
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