Abstract
Rapid, simple and sensitive screening of foodborne pathogens is of great significance to ensure food safety. In this study, an aptamer-functionalized polydiacetylene (Apta-PDA) biosensor was developed for the detection of E. coli O157:H7, S. typhimurium or V. parahaemolyticus. First, aptamers responding to the target bacteria were modified on the surface of magnetic beads by covalent binding to form MBs-oligonucleotide conjugates for bacterial enrichment. Then, an Apta-PDA biosensor was obtained by connecting the aptamers to the PDA nanovesicles using the carbodiimide method. Molecular recognition occurred in the presence of the target bacteria, whereby the aptamer folded into a sequence‐defined unique structure, resulting in an MBs-Apta/bacteria/Apta-PDA sandwich structure. Due to the optical properties of PDA, the blue-red transition of the detection system could be observed by the naked eye and quantified by the colorimetric response percentage (CR%). Under optimized conditions, the detection limits of E. coli O157:H7, S. typhimurium and V. parahaemolyticus were 39, 60 and 60 CFU/ml, respectively, with a selectivity of 100% and a reaction time of 30 min. Compared with the gold standard method, the accuracy of the three target bacteria detection reached 98%, 97.5% and 97%, respectively, and the sensitivity and specificity were both greater than 90%. The entire detection process was rapid and easy to execute without any special equipment, making this technology particularly suitable for resource-poor laboratories or regions.
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Acknowledgements
This work was supported by the Zhejiang Basic Public Welfare Research Program (LGC20C010001), Zhejiang Medical and Health Science and Technology Plan Project (2019KY397), and Zhejiang Provincial Education Department Fund (Y201838965).
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Zhong, Y., Wu, J., Pan, X. et al. Aptamer-functionalized polydiacetylene biosensor for the detection of three foodborne pathogens. ANAL. SCI. 40, 199–211 (2024). https://doi.org/10.1007/s44211-023-00445-y
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DOI: https://doi.org/10.1007/s44211-023-00445-y