Abstract
A disposable horseradish peroxidase (HRP)-based electrochemical genosensor was developed for chronoamperometric detection of single-stranded asymmetric lolB gene PCR amplicon (118 bp in length) of the food-borne pathogen, Vibrio cholerae. A two-step sandwich-type hybridization strategy using two specific probes was employed for specific detection of the target single-stranded DNA (ssDNA). The analytical performances of the detection platform have been evaluated using a synthetic ssDNA (ST3) which was identical to the target single-stranded amplicon and a total of 19 bacterial strains. Under optimal condition, ST3 was calibrated with a dynamic range of 0.4883–15.6250 nM. By coupling asymmetric PCR amplification, the probe-based electrochemical genosensor was highly specific to the target organism (100% specificity) and able to detect as little as 0.85 ng/μl of V. cholerae genomic DNA.
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Acknowledgments
The authors thank the research funding support received in the form of a Research University (RU) grant (grant no: 1001/PPSP/813020) and a Postgraduate Research Grant Scheme (PRGS) (grant no: 1001/PPSP/8144004) from Universiti Sains Malaysia (USM), Malaysia. In addition, support from the Institute of Postgraduate Studies (IPS), USM in the form of a graduate fellowship to Kim-Fatt Low is gratefully acknowledged.
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Low, KF., Chuenrangsikul, K., Rijiravanich, P. et al. Electrochemical genosensor for specific detection of the food-borne pathogen, Vibrio cholerae . World J Microbiol Biotechnol 28, 1699–1706 (2012). https://doi.org/10.1007/s11274-011-0978-x
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DOI: https://doi.org/10.1007/s11274-011-0978-x