Chemical Research in Chinese Universities ›› 2013, Vol. 29 ›› Issue (6): 1219-1224.doi: 10.1007/s40242-013-3085-8

• Articles • Previous Articles     Next Articles

In situ Molecular Self-assembly and Sensitive Label-free Detection of Streptavidin via a Wavelength Interrogated Surface Plasmon Resonance Sensor

YU Yong-jiang1, ZHOU Ying1, LI Qiu-shun2, YANG Yan2, SHI Jian-guo2, LI Ming-yu3, YAO Wei-guo4, WANG Jun-nan5, DONG Wen-fei1, QI Zhi-mei6   

  1. 1. State Key Laboratory on Integrated Optoelectronics, College of Integrated Optoelectronics, Jilin University, Changchun 130012, P. R. China;
    2. Key Biosensor Laboratory of Shandong Province, Biology Institute of Shandong Academy of Sciences, Jinan 250014, P. R. China;
    3. State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, P. R. China;
    4. Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, Changchun 130025, P. R. China;
    5. The Second Hospital of Jilin University, Changchun 130041, P. R. China;
    6. State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, P. R. China
  • Received:2013-03-04 Revised:2013-03-19 Published:2013-11-22
  • Contact: YAO Wei-guo E-mail:yaoweiguo1972@gmail.com
  • Supported by:

    Supported by the National High Technology Research and Development Program of China(No.2012AA063302), the Natio-nal Natural Science Foundation of China(Nos.91123029, 61077066) and the Natural Science Foundation of Shandong Province, China(Nos.ZR2011FQ025, ZR2012CM029).

Abstract:

The sensing sensitivity of wavelength interrogated surface plasmon resonance(WISPR) biosensor is improved by self-assembly of polyelectrolyte multilayer(PEM) film of poly(allylamine hydrochloride)(PAH)/ poly(sodium-p-styrenesulfonate)(PSS) on the Au film coated glass chip via the layer-by-layer(LBL) technique. The home-made WISPR with Krestchmann configuration consists of a tungsten-halogen lamp as a photon source and a charge coupled device(CCD) camera as the detector. The influence of PEM film thickness on the optical properties of WISPR biosensors was investigated theoretically and experimentally. In order to achieve higher sensing sensitivity, the PEM film thickness has to be designed as ca.14 nm at an Au layer thickness of 50 nm and an incidental angle of 11.8°. Furthermore, the PEM coated WISPR biosensor can serve as highly sensitive biosensor, in which the biotin-streptavidin is used as bioconjugate pair. After deposition of the PEM film of (biotin/PAH)(PSS/PAH)3, the mo-dified WISPR biosensor is more sensitive to the low concentration(<0.01 mg/mL) of streptavidin. And the sensing sensitivity can be further increased by one order of magnitude compared with that of the biotin/PAH coated WISPR biosensor. Thus, such low-cost, high-performance and efficient PEM-coated WISPR biosensors have great potentials in a diverse array of fields such as medical diagnostics, drug screening, food safety analysis, environmental monito-ring, and homeland security.

Key words: Polyelectrolyte multilayer, Sensing sensitivity, Biosensor, Wavelength interrogated surface plasmon resonance