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Tian H, Lin J, Wang Q, Xin Q, Zhang D. Enhancing low-concentration cell detection in single entity electrochemical systems through forced convection. Talanta 2024; 276:126266. [PMID: 38759360 DOI: 10.1016/j.talanta.2024.126266] [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: 03/04/2024] [Revised: 05/02/2024] [Accepted: 05/14/2024] [Indexed: 05/19/2024]
Abstract
This study advances the detection of bacteria at low concentrations in single-entity electrochemistry (SEE) systems by integrating forced convection. Our results show that forced convection significantly improves the mass transfer rate of electrolyte, with the mass transfer coefficient demonstrating a proportional relationship to the flow rate to the power of 1.37. Notably, while the collision frequency of E. coli initially increases with the flow rate, a subsequent decrease is observed at higher rates. This pattern is attributed to the mechanics of cell collision under forced convection. Specifically, while forced convection propels cells towards the ultra-microelectrode (UME), it does not aid in their penetration through the boundary layer, leading to cells being driven away from the UME at higher flow rates. This hypothesis is supported by the statistical analysis of collision data, including signal heights and rise times. By optimizing the flow rate to 2 mL/min, we achieved enhanced detection of E. coli in concentrations ranging from 0.9 × 107 to 5.0 × 107 cells/mL. This approach significantly increased collision frequency by elevating the mass transfer of cells, with the mass transfer coefficient rising from 0.1 × 10-5 m/s to 0.9 × 10-5 m/s. It provides a viable solution to the challenges of detecting bacteria at low concentrations in SEE systems.
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Affiliation(s)
- Huike Tian
- School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, 310018, PR China
| | - Jun Lin
- School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, 310018, PR China.
| | - Qingwen Wang
- School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, 310018, PR China
| | - Qing Xin
- School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, 310018, PR China
| | - Dong Zhang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China
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Zhan K, Chen L, Li S, Yu Q, Zhao Z, Li J, Xing Y, Ren H, Wang N, Zhang G. A novel metal-organic framework based electrochemical immunosensor for the rapid detection of Salmonella typhimurium detection in milk. Food Chem 2024; 444:138672. [PMID: 38330614 DOI: 10.1016/j.foodchem.2024.138672] [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: 09/20/2023] [Revised: 01/15/2024] [Accepted: 02/02/2024] [Indexed: 02/10/2024]
Abstract
Salmonella is one of the most prevalent pathogens causing foodborne diseases. In this study, a novel electrochemical immunosensor was designed for the rapid and accurate detection of Salmonella typhimurium (S. typhimurium) in milk. Platinum nanoparticles and Co/Zn-metal-organic framework @carboxylic multiwalled carbon nanotubes in the immunosensor acted synergistically to enhance the sensing sensitivity and stability. The materials and sensors were characterised using X-ray diffractometry, scanning electron microscopy, Fourier-transform infrared spectroscopy, differential pulse voltammetry, cyclic voltammetry, and other techniques. The optimised immunosensor showed a linear response for S. typhimurium concentrations in the range from 1.3 × 102 to 1.3 × 108 CFU mL-1, with a detection limit of 9.4 × 101 CFU mL-1. The assay also demonstrates good specificity, reproducibility, stability, and practical application potential, and the method can be extended to other foodborne pathogens.
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Affiliation(s)
- Ke Zhan
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou 450002, Henan, China; College of Veterinary Medicine International Joint Research Center for Animal Immunology, Zhengzhou 450046, Henan, China; Longhu Laboratory of Advanced Immunology, Zhengzhou 450046, China; Key Laboratory of Animal Immunology of the Ministry of Agriculture, Henan Academy of Agricultural Sciences, 450002 Henan, China; Key Laboratory of Nutrition and Healthy Food of Zhengzhou, Zhengzhou 450002, Henan, China
| | - Linlin Chen
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou 450002, Henan, China; College of Veterinary Medicine International Joint Research Center for Animal Immunology, Zhengzhou 450046, Henan, China; Longhu Laboratory of Advanced Immunology, Zhengzhou 450046, China; Key Laboratory of Animal Immunology of the Ministry of Agriculture, Henan Academy of Agricultural Sciences, 450002 Henan, China; Key Laboratory of Nutrition and Healthy Food of Zhengzhou, Zhengzhou 450002, Henan, China
| | - Shanshan Li
- College of Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, Henan, China; College of Veterinary Medicine International Joint Research Center for Animal Immunology, Zhengzhou 450046, Henan, China; Longhu Laboratory of Advanced Immunology, Zhengzhou 450046, China; Key Laboratory of Animal Immunology of the Ministry of Agriculture, Henan Academy of Agricultural Sciences, 450002 Henan, China; Key Laboratory of Nutrition and Healthy Food of Zhengzhou, Zhengzhou 450002, Henan, China
| | - Qiuying Yu
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou 450002, Henan, China; College of Veterinary Medicine International Joint Research Center for Animal Immunology, Zhengzhou 450046, Henan, China; Longhu Laboratory of Advanced Immunology, Zhengzhou 450046, China; Key Laboratory of Animal Immunology of the Ministry of Agriculture, Henan Academy of Agricultural Sciences, 450002 Henan, China; Key Laboratory of Nutrition and Healthy Food of Zhengzhou, Zhengzhou 450002, Henan, China
| | - Zheng Zhao
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou 450002, Henan, China; College of Veterinary Medicine International Joint Research Center for Animal Immunology, Zhengzhou 450046, Henan, China; Longhu Laboratory of Advanced Immunology, Zhengzhou 450046, China; Key Laboratory of Animal Immunology of the Ministry of Agriculture, Henan Academy of Agricultural Sciences, 450002 Henan, China; Key Laboratory of Nutrition and Healthy Food of Zhengzhou, Zhengzhou 450002, Henan, China
| | - Junwei Li
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou 450002, Henan, China; College of Veterinary Medicine International Joint Research Center for Animal Immunology, Zhengzhou 450046, Henan, China; Longhu Laboratory of Advanced Immunology, Zhengzhou 450046, China; Key Laboratory of Animal Immunology of the Ministry of Agriculture, Henan Academy of Agricultural Sciences, 450002 Henan, China; Key Laboratory of Nutrition and Healthy Food of Zhengzhou, Zhengzhou 450002, Henan, China
| | - Yunrui Xing
- Key Laboratory of Animal Immunology of the Ministry of Agriculture, Henan Academy of Agricultural Sciences, 450002 Henan, China
| | - Hongtao Ren
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou 450002, Henan, China; College of Veterinary Medicine International Joint Research Center for Animal Immunology, Zhengzhou 450046, Henan, China; Longhu Laboratory of Advanced Immunology, Zhengzhou 450046, China; Key Laboratory of Animal Immunology of the Ministry of Agriculture, Henan Academy of Agricultural Sciences, 450002 Henan, China; Key Laboratory of Nutrition and Healthy Food of Zhengzhou, Zhengzhou 450002, Henan, China.
| | - Na Wang
- College of Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, Henan, China; College of Veterinary Medicine International Joint Research Center for Animal Immunology, Zhengzhou 450046, Henan, China; Longhu Laboratory of Advanced Immunology, Zhengzhou 450046, China; Key Laboratory of Animal Immunology of the Ministry of Agriculture, Henan Academy of Agricultural Sciences, 450002 Henan, China; Key Laboratory of Nutrition and Healthy Food of Zhengzhou, Zhengzhou 450002, Henan, China.
| | - Gaiping Zhang
- College of Veterinary Medicine International Joint Research Center for Animal Immunology, Zhengzhou 450046, Henan, China; Longhu Laboratory of Advanced Immunology, Zhengzhou 450046, China; School of Advanced Agriculture Sciences, Peking University, 100871 Beijing, China; Key Laboratory of Animal Immunology of the Ministry of Agriculture, Henan Academy of Agricultural Sciences, 450002 Henan, China
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Zhuang L, Gong J, Zhao Y, Yang J, Liu G, Zhao B, Song C, Zhang Y, Shen Q. Progress in methods for the detection of viable Escherichia coli. Analyst 2024; 149:1022-1049. [PMID: 38273740 DOI: 10.1039/d3an01750h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2024]
Abstract
Escherichia coli (E. coli) is a prevalent enteric bacterium and a necessary organism to monitor for food safety and environmental purposes. Developing efficient and specific methods is critical for detecting and monitoring viable E. coli due to its high prevalence. Conventional culture methods are often laborious and time-consuming, and they offer limited capability in detecting potentially harmful viable but non-culturable E. coli in the tested sample, which highlights the need for improved approaches. Hence, there is a growing demand for accurate and sensitive methods to determine the presence of viable E. coli. This paper scrutinizes various methods for detecting viable E. coli, including culture-based methods, molecular methods that target DNAs and RNAs, bacteriophage-based methods, biosensors, and other emerging technologies. The review serves as a guide for researchers seeking additional methodological options and aiding in the development of rapid and precise assays. Moving forward, it is anticipated that methods for detecting E. coli will become more stable and robust, ultimately contributing significantly to the improvement of food safety and public health.
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Affiliation(s)
- Linlin Zhuang
- School of Animal Husbandry and Veterinary Medicine, Jiangsu Vocational College of Agriculture and Forestry, Jurong 212400, P. R. China.
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering & Basic Medicine Research and Innovation Center of Ministry of Education, Zhongda Hospital, Southeast University, Nanjing 211102, P. R. China.
| | - Jiansen Gong
- Poultry Institute, Chinese Academy of Agricultural Sciences, Yangzhou 225125, P. R. China
| | - Ying Zhao
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering & Basic Medicine Research and Innovation Center of Ministry of Education, Zhongda Hospital, Southeast University, Nanjing 211102, P. R. China.
| | - Jianbo Yang
- School of Animal Husbandry and Veterinary Medicine, Jiangsu Vocational College of Agriculture and Forestry, Jurong 212400, P. R. China.
| | - Guofang Liu
- School of Animal Husbandry and Veterinary Medicine, Jiangsu Vocational College of Agriculture and Forestry, Jurong 212400, P. R. China.
| | - Bin Zhao
- School of Animal Husbandry and Veterinary Medicine, Jiangsu Vocational College of Agriculture and Forestry, Jurong 212400, P. R. China.
| | - Chunlei Song
- School of Animal Husbandry and Veterinary Medicine, Jiangsu Vocational College of Agriculture and Forestry, Jurong 212400, P. R. China.
| | - Yu Zhang
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering & Basic Medicine Research and Innovation Center of Ministry of Education, Zhongda Hospital, Southeast University, Nanjing 211102, P. R. China.
| | - Qiuping Shen
- School of Animal Husbandry and Veterinary Medicine, Jiangsu Vocational College of Agriculture and Forestry, Jurong 212400, P. R. China.
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Jiang M, Wang M, Lai W, Song X, Li J, Liu D, Wei Z, Hong C. Construction of electrochemical and electrochemiluminescent dual-mode aptamer sensors based on ferrocene dual-functional signal probes for the sensitive detection of Alternariol. Anal Chim Acta 2023; 1272:341476. [PMID: 37355320 DOI: 10.1016/j.aca.2023.341476] [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: 04/21/2023] [Revised: 06/02/2023] [Accepted: 06/02/2023] [Indexed: 06/26/2023]
Abstract
In this study, a novel dual-mode aptamer sensor was developed using Fca-DNA2 as the quenching electrochemiluminescence (ECL) and electrochemical (EC) signal response probe, and Ru-MOF/Cu@Au NPs were used as the ECL substrate platform to detect Alternariol (AOH) via a competitive reaction between AOH and Fca-DNA2. Compared with the conventional aptamer sensor with a single detection signal, this dual-mode aptamer sensor has the following advantages: (1) Electrodeposition-based rapid synthesis Ru-MOF on the electrode surface. (2) The Signal amplification substance Cu@Au NPs can synergistically catalyze Triethanolamine (TEOA) to amplify ECL behavior. (3) The aptamer sensor employs the dual-functional material Fca, which can detect both ECL and EC signals, increasing the result accuracy. Both ECL and EC methods have excellent detection performance for AOH in the detection range of 0.1 pg/mL to 100 ng/mL, with detection limits of 0.014 and 0.083 pg/mL, respectively, and are expected to be used for sensitive AOH detection in real samples.
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Affiliation(s)
- Mingzhe Jiang
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi, 832003, PR China
| | - Min Wang
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi, 832003, PR China
| | - Wenjing Lai
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi, 832003, PR China
| | - Xuetong Song
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi, 832003, PR China
| | - Jiajia Li
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi, 832003, PR China
| | - Dan Liu
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi, 832003, PR China
| | - Zhong Wei
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi, 832003, PR China.
| | - Chenglin Hong
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi, 832003, PR China.
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