Abstract
A novel aptamer-AuNP-conjugated carboxymethyl chitosan–functionalized graphene oxide (CMC/GO@Apt-Au NP) probe was for the first time developed for the determination of Salmonella typhimurium (S. typhimurium). Owing to the conformational change of the aptamers in the presence of S. typhimurium, the Au NPs, which were pre-adsorbed on the aptamers through van der Waals forces, were released into the solution phase and induced the color change of the solution. As a result, S. typhimurium ranging from 102 to 107 CFU/mL was successfully identified using the designed assay with a limit of detection (LOD) of 10 CFU/mL. This low detection level allowed the sensitive recognition of S. typhimurium in milk samples within 40 min without sample pretreatment, a conclusion that agreed well with the traditional plate counting method. The developed method not only provides a rapid way for the determination of S. typhimurium with simplicity and sensitivity but also shows potential universality in the quantification of other pathogenic microorganisms.
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Funding
This work was supported by the National Natural Science Foundation of China (grant number 82073607), the Natural Science Foundation of Hunan Province (2021JJ30637), the start-up funds from Central South University (grant number 202045008), and the Fundamental Research Funds for the Central Universities of Central South University (grant number 2022ZZTS0893).
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Wu, P., Huang, R., Chen, C. et al. Aptamer-AuNP-conjugated carboxymethyl chitosan–functionalized graphene oxide for colorimetric identification of Salmonella typhimurium. Microchim Acta 189, 408 (2022). https://doi.org/10.1007/s00604-022-05494-0
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DOI: https://doi.org/10.1007/s00604-022-05494-0