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Issue 6, 2018
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Sensitive colorimetric immunoassay of Vibrio parahaemolyticus based on specific nonapeptide probe screening from a phage display library conjugated with MnO2 nanosheets with peroxidase-like activity

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Abstract

Pathogen detection continues to receive significant attention due to the harmful effects of pathogens on public health. Herein, specific nonapeptide-fusion proteins pVIII (pVIII fusion) were isolated from phage VQTVQIGSD (designated by the sequence of a fused foreign peptide), which was specifically screened from the f8/9 landscape phage library against Vibrio parahaemolyticus (V. parahaemolyticus) in a high-throughput way. The as-prepared V. parahaemolyticus-specific recognition element is cheaper and more available than antibodies. Further, a highly sensitive colorimetric immunoassay for V. parahaemolyticus was established using pVIII fusion as capture probes coupled with protein-templated MnO2 nanosheets (NSs) as signal probes. In the presence of a target bacterium, V. parahaemolyticus, a sandwich-type complex of pVIII fusion–V. parahaemolyticus–MnO2 NS@pVIII fusion was formed through specific recognition of pVIII fusion and V. parahaemolyticus. The signal probes (MnO2 NSs) could catalyze the reaction of 3,3′,5,5′-tetramethylbenzidine and H2O2 to generate a colorimetric change. The proposed V. parahaemolyticus detection method demonstrated a wide detection range (20–104 colony-forming units (CFU) mL−1), low limit of detection (15 CFU mL−1), excellent selectivity, and high reliability for real marine samples, showing potential application in marine microbiological detection and control.

Graphical abstract: Sensitive colorimetric immunoassay of Vibrio parahaemolyticus based on specific nonapeptide probe screening from a phage display library conjugated with MnO2 nanosheets with peroxidase-like activity

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Publication details

The article was received on 06 Sep 2017, accepted on 03 Jan 2018 and first published on 24 Jan 2018


Article type: Paper
DOI: 10.1039/C7NR06633C
Citation: Nanoscale, 2018,10, 2825-2833

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    Sensitive colorimetric immunoassay of Vibrio parahaemolyticus based on specific nonapeptide probe screening from a phage display library conjugated with MnO2 nanosheets with peroxidase-like activity

    P. Liu, L. Han, F. Wang, X. Li, V. A. Petrenko and A. Liu, Nanoscale, 2018, 10, 2825
    DOI: 10.1039/C7NR06633C

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