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A SPR Aptasensor for Detection of Avian Influenza Virus H5N1
Department of Biological and Agricultural Engineering, University of Arkansas, Fayetteville, AR 72701, USA
Department of Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA
Animal Diagnostic Laboratory, Pennsylvania State University, University Park, PA 16802, USA
* Author to whom correspondence should be addressed.
Received: 30 July 2012; in revised form: 27 August 2012 / Accepted: 28 August 2012 / Published: 13 September 2012
Abstract: Rapid and specific detection of avian influenza virus (AIV) is urgently needed due to the concerns over the potential outbreaks of highly pathogenic H5N1 influenza in animals and humans. Aptamers are artificial oligonucleic acids that can bind specific target molecules, and show comparable affinity for target viruses and better thermal stability than monoclonal antibodies. The objective of this research was to use a DNA-aptamer as the specific recognition element in a portable Surface Plasmon Resonance (SPR) biosensor for rapid detection of AIV H5N1 in poultry swab samples. A SPR biosensor was fabricated using selected aptamers that were biotinylated and then immobilized on the sensor gold surface coated with streptavidin via streptavidin-biotin binding. The immobilized aptamers captured AIV H5N1 in a sample solution, which caused an increase in the refraction index (RI). After optimizing the streptavidin and aptamer parameters, the results showed that the RI value was linearly related (R2 = 0.99) to the concentration of AIV in the range of 0.128 to 1.28 HAU. Negligible signal ( < 4% of H5N1) was observed from six non-target AIV subtypes. The AIV H5N1 in poultry swab samples with concentrations of 0.128 to 12.8 HAU could be detected using this aptasensor in 1.5 h.
Keywords: aptamer; surface plasmon resonance; biosensor; avian influenza virus
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MDPI and ACS Style
Bai, H.; Wang, R.; Hargis, B.; Lu, H.; Li, Y. A SPR Aptasensor for Detection of Avian Influenza Virus H5N1. Sensors 2012, 12, 12506-12518.
Bai H, Wang R, Hargis B, Lu H, Li Y. A SPR Aptasensor for Detection of Avian Influenza Virus H5N1. Sensors. 2012; 12(9):12506-12518.
Bai, Hua; Wang, Ronghui; Hargis, Billy; Lu, Huaguang; Li, Yanbin. 2012. "A SPR Aptasensor for Detection of Avian Influenza Virus H5N1." Sensors 12, no. 9: 12506-12518.