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Li S, Zhang Y, Guo M, Yi Z, Hu M, Xiong C, Huang G, Zhang J. Rapid detection of Salmonella in milk by labeling-free electrochemical immunosensor based on an Fe 3O 4-ionic liquid-modified electrode. Talanta 2024; 270:125576. [PMID: 38147723 DOI: 10.1016/j.talanta.2023.125576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Revised: 12/15/2023] [Accepted: 12/19/2023] [Indexed: 12/28/2023]
Abstract
Electrochemical sensors show distinct advantages over other types of sensors in the rapid detection of microorganisms. Here, we attempted to construct a label-free electrochemical immunosensor based on an Fe3O4-ionic liquid (IL)-modified electrode to rapidly detect Salmonella in milk. The excellent ionic conductivity of the IL facilitated sensor construction, and the large surface area of nano-Fe3O4 provided numerous sites for subsequent experiments. An antibody was fixed on the Fe3O4-IL complex with polyglutamic acid modification by a simple infusion method. The microstructure of the Fe3O4-IL composites was investigated by scanning electron microscopy, and the elements and structures of the composites were analyzed by energy dispersive X-ray and Fourier transform infrared spectroscopy. Under optimized experimental conditions, the detection range of the constructed sensor was 3.65 × 102-3.65 × 108 CFU mL-1, and the LOD was 1.12 × 102 CFU mL-1 (S/N = 3). In addition, the prepared electrochemical immunosensor is convenient for detecting foodborne pathogens because of its outstanding stability, good selectivity, and repeatability.
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Affiliation(s)
- Shuang Li
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Yu Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Mengdi Guo
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Zhibin Yi
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Mengna Hu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Chunhong Xiong
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Ganhui Huang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Jinsheng Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China.
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Dai G, Yao H, Yang L, Ding Y, Du S, Shen H, Mo F. Rapid detection of foodborne pathogens in diverse foodstuffs by universal electrochemical aptasensor based on UiO-66 and methylene blue composites. Food Chem 2023; 424:136244. [PMID: 37244183 DOI: 10.1016/j.foodchem.2023.136244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 04/05/2023] [Accepted: 04/24/2023] [Indexed: 05/29/2023]
Abstract
Rapid and sensitive detection of foodborne pathogens in complex environments is essential for food protection. A universal electrochemical aptasensor was fabricated for the detection of three common foodborne pathogens, including Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), and Salmonella typhimurium (S. typhimurium). The aptasensor was developed based on the homogeneous and membrane filtration strategy. Zirconium-based metal-organic framework (UiO-66)/methylene blue (MB)/aptamer composite was designed as a signal amplification and recognition probe. Bacteria were quantitatively detected by the current changes of MB. By simply changing the aptamer, different bacteria could be detected. The detection limits of E. coli, S. aureus and S. typhimurium were 5, 4 and 3 CFU·mL-1, respectively. In humidity and salt environments, the stability of the aptasensor was satisfactory. The aptasensor exhibited satisfactory detection performance in different real samples. This aptasensor has excellent potential for rapid detection of foodborne pathogens in complex environments.
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Affiliation(s)
- Ge Dai
- Department of Naval Nutrition and Food Hygiene, Faculty of Naval Medicine, Naval Medical University, 800 Xiangyin Road, Shanghai 200433, China
| | - Handong Yao
- Department of Naval Nutrition and Food Hygiene, Faculty of Naval Medicine, Naval Medical University, 800 Xiangyin Road, Shanghai 200433, China; School of Engineering, Huzhou University, Huzhou 313000, China
| | - Liuhong Yang
- Department of Naval Nutrition and Food Hygiene, Faculty of Naval Medicine, Naval Medical University, 800 Xiangyin Road, Shanghai 200433, China; School of Health Science and Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China
| | - Yifeng Ding
- Department of Naval Nutrition and Food Hygiene, Faculty of Naval Medicine, Naval Medical University, 800 Xiangyin Road, Shanghai 200433, China; School of Health Science and Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China
| | - Shuxin Du
- School of Engineering, Huzhou University, Huzhou 313000, China
| | - Hui Shen
- Department of Naval Nutrition and Food Hygiene, Faculty of Naval Medicine, Naval Medical University, 800 Xiangyin Road, Shanghai 200433, China.
| | - Fengfeng Mo
- Department of Naval Nutrition and Food Hygiene, Faculty of Naval Medicine, Naval Medical University, 800 Xiangyin Road, Shanghai 200433, China.
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