Smartphone-assisted biosensor based on broom-like bacteria-specific magnetic enrichment platform for colorimetric detection of Listeria monocytogenes.

Autor: Xiao F; State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, PR China., Li W; State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, PR China., Wang Z; Zhejiang Rural Commercial Digital Technology Co., Ltd., Hangzhou 310016, PR China., Xu Q; State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, PR China., Song Y; State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, PR China., Huang J; State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, PR China., Bai X; State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, PR China., Xu H; State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, PR China. Electronic address: kidyxu@163.com.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2023 Oct 05; Vol. 459, pp. 132250. Date of Electronic Publication: 2023 Aug 08.
DOI: 10.1016/j.jhazmat.2023.132250
Abstrakt: Pathogenic bacteria contamination poses a major threat to human health. The detection of low-abundance bacteria in complex samples has always been a knotty problem, and high-sensitivity bacterial detection remains challenging. In this work, a novel magnetic platform with high enrichment efficiency for L. monocytogenes was developed. The magnetic platform was designed by branched polyglutamic acid-mediated indirect coupling of cefepime on magnetic nanoparticles (Cefe-PGA-MNPs), and the specific enrichment of low-abundance L. monocytogenes in real samples was achieved by an external magnet, with a capture efficiency over 90%. A controllable and highly active platinum-palladium nanozyme was synthesized and further introduced in the magnetic nanoplatform for the construction of enzymatic colorimetric biosensor. The total detection time for L. monocytogenes was within 100 min. The colorimetric signals generated by labelled nanozyme were corresponding to different concentrations of L. monocytogenes, with a limit of detection (LOD) of 3.1 × 10 1 CFU/mL, and high reliability and accuracy (with a recovery rate ranging from 96.5% to 116.4%) in the test of real samples. The concept of the developed method is applicable to various fields of biosensing that rely on magnetic separation platforms.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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