Abstract
An innovative aptamer labeled with 5-FAM has been developed with a high affinity for Yersinia enterocolitica (Y. enterocolitica) using graphene oxide (GO) as a quenching platform. The selectivity of the prepared system was evaluated in the presence of common coexisted bacteria like Yersinia pseudotuberculosis, Staphylococcus aureus, Listeria monocytogenes, Escherichia coli, and Salmonella typhimurium. Some experimental factors like pH and stability were investigated. The results showed that in the absence of Y. enterocolitica, aptamer labeled with 5-FAM was bonded with GO, causing fluorescence to be relatively weak. After the addition of Y. enterocolitica, the aptamer is released from the GO surface and binds to the target bacteria, and significantly increases the fluorescence intensity with an excitation wavelength of 410 nm and an emission wavelength of 530 nm. After optimizing all conditions, the system exhibited a wide linear response for Y. enterocolitica in the concentration range 10 to 1.0 × 109 CFU•mL–1 and the limit of detection (LOD) was 3 CFU•mL–1. This system demonstrated that GO-designed aptamers can be successful in detecting Y. enterocolitica in whole-cell forms, making them potentially useful for screening and rapid detection.
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The data that support the findings of this study are available from the corresponding author, [Ali Ehsani], upon reasonable request.
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Funding
The research protocol was approved and supported by the Student Research Committee, Tabriz University of Medical Sciences (grant number: 68658). Also, this study has been approved and supported by the Department of Food Science and Technology, Faculty of Nutrition and Food Sciences, Tabriz University of Medical Sciences, Tabriz, Iran. We gratefully acknowledge their assistance.
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Tavassoli, M., Khezerlou, A., Hamishehkar, H. et al. An ultrasensitive aptamer-based fluorescent on/off system for trace amount evaluation of Yersinia enterocolitica in food samples. Microchim Acta 190, 253 (2023). https://doi.org/10.1007/s00604-023-05820-0
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DOI: https://doi.org/10.1007/s00604-023-05820-0