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J Nanosci Nanotechnol. 2018 Mar 1;18(3):1599-1605. doi: 10.1166/jnn.2018.14212.

Surface Plasmon Resonance Aptamer Biosensor for Discriminating Pathogenic Bacteria Vibrio parahaemolyticus.

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School of Biological Sciences, Chungbuk National University 1 Chungdae-Ro, Seowon-Gu, Cheongju 28644, South Korea.
College of Veterinary Medicine, Western University of Health Sciences, Pomona CA 91766, USA.
Department of Food Science and Biotechnology, Shin Ansan University, 135, Sinansandaehak-ro, Danwon-Gu, Ansan 425-792, South Korea.
Department of Bioprocess Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-Gu Jeonju, Jeonbuk 54896, South Korea.


In this paper, whole-bacteria SELEX (WB-SELEX) strategy was adopted to isolate specific aptamers against Vibrio parahaemolyticus. Round selection for V. parahaemolyticus was conducted 11 rounds, including two negative selection rounds. It was determined through real-time PCR amplification and post-SELEX experiment. The selected aptmers had high binding property and specificity to V. parahaemolyticus. Of 28 aptamers tested, VPCA-apta#1 had the highest binding affinity compared to other aptamer candidates obtained. To detect V. parahaemolyticus, aptamer based SPR biosensor platform was constructed and pathogenic bacteria sensing was conducted in two steps. The first step was to construct 5'-biotinylated VPCA-apta#1 binding probe. The second step was to incubate V. parahaemolyticus and test microbes in functionalized SA sensor chip in parallel. Our platform showed significant activity for detecting and discriminating V. parahaemolyticus from other enteric species such as Escherichia coli, Listeria monocytogenes, Sigella sonnei, and Vibrio fischeri. This is the first report on the use of whole-SELEX to isolate DNA aptamers specific for V. parahaemolyticus. We demonstrated the feasibility of using aptamer platform for the detection of V. parahaemolyticus in various food supplies. It might be used in multiple points of care for diagnosing Vibriosis.

[Indexed for MEDLINE]

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