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Wang J, Cui X, Liang L, Li J, Pang B, Li J. Advances in DNA-based electrochemical biosensors for the detection of foodborne pathogenic bacteria. Talanta 2024; 275:126072. [PMID: 38615455 DOI: 10.1016/j.talanta.2024.126072] [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: 01/16/2024] [Revised: 03/18/2024] [Accepted: 04/06/2024] [Indexed: 04/16/2024]
Abstract
The detection of foodborne pathogenic bacteria is critical in preventing foodborne diseases. DNA-based electrochemical biosensors, with the merits of high sensitivity and short detection time, provide an effective detecting method for foodborne pathogens, attracting significant interest for the past few years. This review mainly describes the important research progress of DNA-based electrochemical biosensors for the detection of foodborne pathogenic bacteria through four perspectives: representative foodborne pathogens detection using electrochemical approaches, DNA immobilization strategies of aptamers, DNA-based signal amplification strategies used in electrochemical DNA sensors, and functional DNA used in electrochemical DNA sensors. Finally, perspectives and challenges are presented in this field. This review will contribute to DNA-based electrochemical biosensor in enhancing the nucleic acid signal amplification.
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Affiliation(s)
- Jun Wang
- School of Public Health, Jilin University, Changchun, Jilin, 130021, China
| | - Xueting Cui
- School of Public Health, Jilin University, Changchun, Jilin, 130021, China
| | - Lanqian Liang
- School of Public Health, Jilin University, Changchun, Jilin, 130021, China
| | - Juan Li
- School of Public Health, Jilin University, Changchun, Jilin, 130021, China.
| | - Bo Pang
- School of Public Health, Jilin University, Changchun, Jilin, 130021, China.
| | - Jinhua Li
- School of Public Health, Jilin University, Changchun, Jilin, 130021, China.
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2
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Lee SY, Oh SW. Point-of-Care Diagnostic System for Viable Salmonella Species via Improved Propidium Monoazide and Recombinase Polymerase Amplification Based Nucleic Acid Lateral Flow. Diagnostics (Basel) 2024; 14:831. [PMID: 38667476 PMCID: PMC11049151 DOI: 10.3390/diagnostics14080831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Revised: 04/05/2024] [Accepted: 04/05/2024] [Indexed: 04/28/2024] Open
Abstract
Salmonella species are prominent foodborne microbial pathogens transmitted through contaminated food or water and pose a significant threat to human health. Accurate and rapid point-of-care (POC) diagnosis is gaining attention in effectively preventing outbreaks of foodborne disease. However, the presence of dead bacteria can interfere with an accurate diagnosis, necessitating the development of methods for the rapid, simple, and efficient detection of viable bacteria only. Herein, we used an improved propidium monoazide (PMAxx) to develop a nucleic acid lateral flow (NALF) assay based on recombinase polymerase amplification (RPA) to differentiate viable Salmonella Typhimurium. We selected an RPA primer set targeting the invA gene and designed a probe for NALF. RPA-based NALF was optimized for temperature (30-43 °C), time (1-25 min), and endonuclease IV concentration (0.025-0.15 unit/µL). PMAxx successfully eliminated false-positive results from dead S. Typhimurium, enabling the accurate detection of viable S. Typhimurium with a detection limit of 1.11 × 102 CFU/mL in pure culture. The developed method was evaluated with spiked raw chicken breast and milk with analysis completed within 25 min at 39 °C. This study has potential as a tool for the POC diagnostics of viable foodborne pathogens with high specificity, sensitivity, rapidity, and cost-effectiveness.
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Affiliation(s)
| | - Se-Wook Oh
- Department of Food and Nutrition, Kookmin University, Seoul 136-702, Republic of Korea;
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3
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Campuzano S, Pingarrón JM. Electrochemical Affinity Biosensors: Pervasive Devices with Exciting Alliances and Horizons Ahead. ACS Sens 2023; 8:3276-3293. [PMID: 37534629 PMCID: PMC10521145 DOI: 10.1021/acssensors.3c01172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 07/25/2023] [Indexed: 08/04/2023]
Abstract
Electrochemical affinity biosensors are evolving at breakneck speed, strengthening and colonizing more and more niches and drawing unimaginable roadmaps that increasingly make them protagonists of our daily lives. They achieve this by combining their intrinsic attributes with those acquired by leveraging the significant advances that occurred in (nano)materials technology, bio(nano)materials and nature-inspired receptors, gene editing and amplification technologies, and signal detection and processing techniques. The aim of this Perspective is to provide, with the support of recent representative and illustrative literature, an updated and critical view of the repertoire of opportunities, innovations, and applications offered by electrochemical affinity biosensors fueled by the key alliances indicated. In addition, the imminent challenges that these biodevices must face and the new directions in which they are envisioned as key players are discussed.
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Affiliation(s)
- Susana Campuzano
- Departamento de Química Analítica,
Facultad de Ciencias Químicas, Universidad
Complutense de Madrid, 28040 Madrid, España
| | - José M. Pingarrón
- Departamento de Química Analítica,
Facultad de Ciencias Químicas, Universidad
Complutense de Madrid, 28040 Madrid, España
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4
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Mota DS, Guimarães JM, Gandarilla AMD, Filho JCBS, Brito WR, Mariúba LAM. Recombinase polymerase amplification in the molecular diagnosis of microbiological targets and its applications. Can J Microbiol 2022; 68:383-402. [PMID: 35394399 DOI: 10.1139/cjm-2021-0329] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Since the introduction of the polymerase chain reaction (PCR) technique in 1983, nucleic acid amplification has permeated all fields of biological science, particularly clinical research. Despite its importance, PCR has been restricted to specialized centers and its use in laboratories with few resources is limited. In recent decades, there has been a notable increase in the development of new isothermal technologies for molecular diagnosis with the hope of overcoming the traditional limitations of the laboratory. Among these technologies, recombinase polymerase amplification (RPA) has a wide application potential because it does not require thermocyclers and has high sensitivity, specificity, simplicity, and detection speed. This technique has been used for DNA and RNA amplification in various pathogenic organisms such as viruses, bacteria, and parasites. In addition, RPA has been successfully implemented in different detection strategies, making it a promising alternative for performing diagnoses in environments with scarce resources and a high burden of infectious diseases. In this study, we present a review of the use of RPA in clinical settings and its implementation in various research areas.
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Affiliation(s)
- D S Mota
- Programa de Pós-graduação em Imunologia Básica e Aplicada, Universidade Federal do Amazonas (UFAM), Manaus, AM, 69067-005, Brazil
| | - J M Guimarães
- Centro Multiusuário para Análises de Fenômenos Biomédicos, Universidade do Estado do Amazonas (UEA), Manaus, AM, 69065-00, Brazil
| | - A M D Gandarilla
- Departamento de Química, ICE, Universidade Federal do Amazonas (UFAM), Manaus, AM, 69067-005, Brazil.,Laboratório de Bioeletrônica e Eletroquímica, LABEL, Central Analítica, Universidade Federal do Amazonas (UFAM), Manaus, AM, 69067-005, Brazil
| | - J C B S Filho
- Departamento de Química, ICE, Universidade Federal do Amazonas (UFAM), Manaus, AM, 69067-005, Brazil.,Laboratório de Bioeletrônica e Eletroquímica, LABEL, Central Analítica, Universidade Federal do Amazonas (UFAM), Manaus, AM, 69067-005, Brazil
| | - W R Brito
- Departamento de Química, ICE, Universidade Federal do Amazonas (UFAM), Manaus, AM, 69067-005, Brazil.,Laboratório de Bioeletrônica e Eletroquímica, LABEL, Central Analítica, Universidade Federal do Amazonas (UFAM), Manaus, AM, 69067-005, Brazil
| | - L A M Mariúba
- Programa de Pós-graduação em Imunologia Básica e Aplicada, Universidade Federal do Amazonas (UFAM), Manaus, AM, 69067-005, Brazil.,Fundação Oswaldo Cruz, Fiocruz, Instituto Leônidas e Maria Deane (ILMD-FIOCRUZ), Manaus, AM, 69057-070, Brazil.,Programa de Pós-Graduação em Biotecnologia, Instituto de Ciências Biológicas, Universidade Federal do Amazonas (UFAM), Manaus, AM, 69057-070, Brazil.,Programa de Pós-Graduação em Biologia Celular e Molecular, Fundação Oswaldo Cruz, Fiocruz, Instituto Oswaldo Cruz, Rio de Janeiro, RJ, 21040-360, Brazil
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5
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Solid-phase recombinase polymerase amplification using ferrocene-labelled dNTPs for electrochemical detection of single nucleotide polymorphisms. Biosens Bioelectron 2022; 198:113825. [PMID: 34838372 DOI: 10.1016/j.bios.2021.113825] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 11/01/2021] [Accepted: 11/18/2021] [Indexed: 11/21/2022]
Abstract
Hypertrophic cardiomyopathies (HCM) are the principal cause of sudden cardiac death in young athletes and it is estimated that 1 in 500 people have HCM. The aim of this work was to develop an electrochemical platform for the detection of HCM-associated SNP in the Myosin Heavy Chain 7 (MYH7) gene, in fingerprick blood samples. The platform exploits isothermal solid-phase primer elongation using recombinase polymerase amplification with either individual or a combination of four ferrocene-labelled nucleoside triphosphates. Four thiolated reverse primers containing a variable base at their 3' end were immobilised on individual gold electrodes of an array. Following hybridisation with target DNA, solid phase recombinase polymerase amplification was carried out and primer elongation incorporating the ferrocene labelled oligonucleotides was only detected at one of the electrodes, thus facilitating identification of the SNP under interrogation. The assay was applied to the direct detection of the SNP in fingerprick blood samples from eight different individuals, with the results obtained corroborating with next generation sequencing. The ability to be able to robustly identify the SNP using a 10 μL fingerprick sample, demonstrates that SNP discrimination is achieved using low femtomolar (ca. 8 × 105 copies DNA) levels of DNA.
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6
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Jauset-Rubio M, Ortiz M, O'Sullivan CK. Solid-Phase Primer Elongation Using Biotinylated dNTPs for the Detection of a Single Nucleotide Polymorphism from a Fingerprick Blood Sample. Anal Chem 2021; 93:14578-14585. [PMID: 34704755 PMCID: PMC8581964 DOI: 10.1021/acs.analchem.1c03419] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Isothermal recombinase polymerase amplification-based solid-phase primer extension is used for the optical detection of a hypertrophic cardiomyopathy associated single nucleotide polymorphism (SNP) in a fingerprick blood sample. The assay exploits four thiolated primers which have the same sequences with the exception of the 3'-terminal base. Target DNA containing the SNP site hybridizes to all four of the immobilized probes, with primer extension only taking place from the primer containing the terminal base that is complementary to the SNP under interrogation. Biotinylated deoxynucleotide triphosphates are used in the primer extension, allowing postextension addition of streptavidin-poly-horseradish peroxidase to bind to the incorporated biotinylated dNTPs. The signal generated following substrate addition can then be measured optically. The percentage of biotinylated dNTPs and the duration of primer extension is optimized and the system applied to the identification of a SNP in a fingerprick blood sample. A methodology of thermal lysis using a 1 in 5 dilution of the fingerprick blood sample prior to application of 95 °C for 30 s is used to extract genomic DNA, which is directly used as a template for solid-phase primer extension on microtiter plates, followed by optical detection. The SNP in the fingerprick sample was identified and its identity corroborated using ion torrent next generation sequencing. Ongoing work is focused on extension to the multiplexed detection of SNPs in fingerprick and other biological samples.
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Affiliation(s)
- Miriam Jauset-Rubio
- INTERFIBIO Research Group, Departament d'Enginyeria Química, Universitat Rovira i Virgili, Avinguda Països Catalans 26, 43007 Tarragona, Spain
| | - Mayreli Ortiz
- INTERFIBIO Research Group, Departament d'Enginyeria Química, Universitat Rovira i Virgili, Avinguda Països Catalans 26, 43007 Tarragona, Spain
| | - Ciara K O'Sullivan
- INTERFIBIO Research Group, Departament d'Enginyeria Química, Universitat Rovira i Virgili, Avinguda Països Catalans 26, 43007 Tarragona, Spain.,InstitucióCatalana de Recerca i Estudis Avancats (ICREA), Passeig Lluís Companys 23, 08010 Barcelona, Spain
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7
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Butterworth A, Pratibha P, Marx A, Corrigan DK. Electrochemical Detection of Oxacillin Resistance using Direct-Labeling Solid-Phase Isothermal Amplification. ACS Sens 2021; 6:3773-3780. [PMID: 34595928 DOI: 10.1021/acssensors.1c01688] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Isothermal amplification reactions represent an important and exciting approach to achieve widespread, low cost, and easily implemented molecular diagnostics. This work presents a modified recombinase polymerase amplification (RPA) reaction, which can be directly coupled to a simple electrochemical measurement to ultimately allow development of a nucleic acid-based assay for antibiotic resistance genes. It is shown that use of reagents from a standard RPA reaction kit allows incorporation of horse radish peroxidase-labeled thymine nucleotides into amplified DNA strands, which can be detected via an amperometric signal readout for detection of important gene sequences. The assay is exemplified through detection of fragments of the oxacillin resistance gene in Escherichia coli cells bearing a drug resistance plasmid, achieving a potential limit of detection of 319 cfus/mL and an unoptimized time to result of 60 min. This work serves as a suitable demonstration of the potential for a system to deliver detection of key drug resistance genes at clinically relevant levels.
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Affiliation(s)
- Adrian Butterworth
- Department of Biomedical Engineering, Wolfson Centre, University of Strathclyde, 106 Rottenrow East, Glasgow G1 1XQ, U.K
| | - Pratibha Pratibha
- Department of Chemistry, Konstanz Research School Chemical Biology, University of Konstanz, Universitätsstraße 10, Konstanz 78457, Germany
| | - Andreas Marx
- Department of Chemistry, Konstanz Research School Chemical Biology, University of Konstanz, Universitätsstraße 10, Konstanz 78457, Germany
| | - Damion K. Corrigan
- Department of Biomedical Engineering, Wolfson Centre, University of Strathclyde, 106 Rottenrow East, Glasgow G1 1XQ, U.K
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8
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Biosensors Based on Isothermal DNA Amplification for Bacterial Detection in Food Safety and Environmental Monitoring. SENSORS 2021; 21:s21020602. [PMID: 33467078 PMCID: PMC7831002 DOI: 10.3390/s21020602] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 01/11/2021] [Accepted: 01/14/2021] [Indexed: 02/06/2023]
Abstract
The easy and rapid spread of bacterial contamination and the risk it poses to human health makes evident the need for analytical methods alternative to conventional time-consuming laboratory-based techniques for bacterial detection. To tackle this demand, biosensors based on isothermal DNA amplification methods have emerged, which avoid the need for thermal cycling, thus facilitating their integration into small and low-cost devices for in situ monitoring. This review focuses on the breakthroughs made on biosensors based on isothermal amplification methods for the detection of bacteria in the field of food safety and environmental monitoring. Optical and electrochemical biosensors based on loop mediated isothermal amplification (LAMP), rolling circle amplification (RCA), recombinase polymerase amplification (RPA), helicase dependent amplification (HDA), strand displacement amplification (SDA), and isothermal strand displacement polymerisation (ISDPR) are described, and an overview of their current advantages and limitations is provided. Although further efforts are required to harness the potential of these emerging analytical techniques, the coalescence of the different isothermal amplification techniques with the wide variety of biosensing detection strategies provides multiple possibilities for the efficient detection of bacteria far beyond the laboratory bench.
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9
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Khaliliazar S, Ouyang L, Piper A, Chondrogiannis G, Hanze M, Herland A, Hamedi MM. Electrochemical Detection of Genomic DNA Utilizing Recombinase Polymerase Amplification and Stem-Loop Probe. ACS OMEGA 2020; 5:12103-12109. [PMID: 32548389 PMCID: PMC7271026 DOI: 10.1021/acsomega.0c00341] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Accepted: 03/27/2020] [Indexed: 05/04/2023]
Abstract
Nucleic acid tests integrated into digital point-of-care (POC) diagnostic systems have great potential for the future of health care. However, current methods of DNA amplification and detection require bulky and expensive equipment, many steps, and long process times, which complicate their integration into POC devices. We have combined an isothermal DNA amplification method, recombinase polymerase amplification, with an electrochemical stem-loop (S-L) probe DNA detection technique. By combining these methods, we have created a system that is able to specifically amplify and detect as few as 10 copies/μL Staphylococcus epidermidis DNA with a total time to result of 70-75 min.
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Affiliation(s)
- Shirin Khaliliazar
- Department
of Fibre and Polymer Technology; School of Engineering Sciences in
Chemistry, Biotechnology and Health, KTH
Royal Institute of Technology, Tekninkringen 56-58, SE-100 44 Stockholm, Sweden
| | - Liangqi Ouyang
- Department
of Fibre and Polymer Technology; School of Engineering Sciences in
Chemistry, Biotechnology and Health, KTH
Royal Institute of Technology, Tekninkringen 56-58, SE-100 44 Stockholm, Sweden
| | - Andrew Piper
- Department
of Fibre and Polymer Technology; School of Engineering Sciences in
Chemistry, Biotechnology and Health, KTH
Royal Institute of Technology, Tekninkringen 56-58, SE-100 44 Stockholm, Sweden
| | - Georgios Chondrogiannis
- Department
of Fibre and Polymer Technology; School of Engineering Sciences in
Chemistry, Biotechnology and Health, KTH
Royal Institute of Technology, Tekninkringen 56-58, SE-100 44 Stockholm, Sweden
| | - Martin Hanze
- Department
of Fibre and Polymer Technology; School of Engineering Sciences in
Chemistry, Biotechnology and Health, KTH
Royal Institute of Technology, Tekninkringen 56-58, SE-100 44 Stockholm, Sweden
| | - Anna Herland
- Department
of Micro and Nanosystem; School of Electrical Engineering and Computer
Science, KTH Royal Institute of Technology, Malvinas Väg 10, SE 114 28, Stockholm Sweden
- AIMES,
Advancement for Integrated Medical and Engineering Sciences, Department
of Neuroscience, Karolinska Institute, SE 171 77, Stockholm Sweden
| | - Mahiar Max Hamedi
- Department
of Fibre and Polymer Technology; School of Engineering Sciences in
Chemistry, Biotechnology and Health, KTH
Royal Institute of Technology, Tekninkringen 56-58, SE-100 44 Stockholm, Sweden
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10
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Lorenzo-Gómez R, González-Robles D, Miranda-Castro R, de-los-Santos-Álvarez N, Lobo-Castañón MJ. On the Electrochemical Detection of Alpha-Fetoprotein Using Aptamers: DNA Isothermal Amplification Strategies to Improve the Performance of Weak Aptamers. BIOSENSORS 2020; 10:E46. [PMID: 32365872 PMCID: PMC7277757 DOI: 10.3390/bios10050046] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 04/27/2020] [Accepted: 04/28/2020] [Indexed: 11/16/2022]
Abstract
Affinity characterization is essential to develop reliable aptamers for tumor biomarker detection. For alpha-fetoprotein (AFP), a biomarker of hepatocellular carcinoma (HCC), two DNA aptamers were described with very different affinity. In this work, we estimate the dissociation constant of both of them by means of a direct assay on magnetic beads modified with AFP and electrochemical detection on carbon screen-printed electrodes (SPCE). Unlike previous works, both aptamers showed similar dissociation constant (Kd) values, in the subµM range. In order to improve the performance of these aptamers, we proposed the isothermal amplification of the aptamers by both terminal deoxynucleotidyl transferase (TdT) and rolling circle amplification (RCA). Both DNA amplifications improved the sensitivity and also the apparent binding constants from 713 nM to 189 nM for the short aptamer and from 526 nM to 32 nM for the long aptamer. This improvement depends on the true affinity of the binding pair, which ultimately limits the analytical usefulness.
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Affiliation(s)
- Ramón Lorenzo-Gómez
- Departamento de Química Física y Analítica, Universidad de Oviedo, Av. Julián Clavería 8, 33006 Oviedo, Spain; (R.L.-G.); (D.G.-R.); (R.M.-C.); (N.d.-l.-S.-Á.)
- Instituto de Investigación Sanitaria del Principado de Asturias, Avenida de Roma, 33011 Oviedo, Spain
| | - Daniel González-Robles
- Departamento de Química Física y Analítica, Universidad de Oviedo, Av. Julián Clavería 8, 33006 Oviedo, Spain; (R.L.-G.); (D.G.-R.); (R.M.-C.); (N.d.-l.-S.-Á.)
| | - Rebeca Miranda-Castro
- Departamento de Química Física y Analítica, Universidad de Oviedo, Av. Julián Clavería 8, 33006 Oviedo, Spain; (R.L.-G.); (D.G.-R.); (R.M.-C.); (N.d.-l.-S.-Á.)
- Instituto de Investigación Sanitaria del Principado de Asturias, Avenida de Roma, 33011 Oviedo, Spain
| | - Noemí de-los-Santos-Álvarez
- Departamento de Química Física y Analítica, Universidad de Oviedo, Av. Julián Clavería 8, 33006 Oviedo, Spain; (R.L.-G.); (D.G.-R.); (R.M.-C.); (N.d.-l.-S.-Á.)
- Instituto de Investigación Sanitaria del Principado de Asturias, Avenida de Roma, 33011 Oviedo, Spain
| | - María Jesús Lobo-Castañón
- Departamento de Química Física y Analítica, Universidad de Oviedo, Av. Julián Clavería 8, 33006 Oviedo, Spain; (R.L.-G.); (D.G.-R.); (R.M.-C.); (N.d.-l.-S.-Á.)
- Instituto de Investigación Sanitaria del Principado de Asturias, Avenida de Roma, 33011 Oviedo, Spain
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Xu Y, Dai Y, Li C, Zhang H, Guo M, Yang Y. PC software-based portable cyclic voltammetry system with PB-MCNT-GNPs-modified electrodes for E. coli detection. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:014103. [PMID: 32012638 DOI: 10.1063/1.5113655] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 12/19/2019] [Indexed: 06/10/2023]
Abstract
PC software-based portable cyclic voltammetry (PCV) systems have the advantages of portability, high performance, and real-time detection. In this paper, the PCV system used cyclic voltammetry (CV) as the main detection and analysis method and contained the following components: a three-electrode unit, a portable potentiostat, and PC software. The PC software was used as the system control and display, and a dynamic peak position adjustment (DPPA) algorithm for E. coli measurements based on thick biofilm modification on electrodes was designed especially for this system to realize the real-time correspondence between the measured results and the modified electrodes. The performance test results obtained by setting different detection parameters in the PCV system were compared with those of commercial electrochemical workstations. The difference was less than 4.99%, with a relative standard deviation less than 0.20%. An electrochemical biosensor based on a Prussian blue-multiwalled carbon nanotube-gold nanoparticle composite was developed for E. coli detection. After constructing an antibody-BSA-E. coli electrode modification on the sensor, experimental data processed by the DPPA algorithm showed that the logarithm (lg DfE.coli) of the E. coli dilution factor and the peak current response had a linear relationship. The PCV system could quickly and accurately detect E. coli concentrations with dynamic adjustment algorithms for biofilm-modified electrodes. Furthermore, the system could detect the electrochemical activities of various high-sensitivity biomolecules, showing great detection potential for on-site monitoring and meeting the requirements of real-time and portable detection in various food safety fields.
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Affiliation(s)
- Ying Xu
- College of Automation, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, Zhejiang Province, China
| | - Yan Dai
- College of Automation, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, Zhejiang Province, China
| | - Chao Li
- College of Automation, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, Zhejiang Province, China
| | - Haijing Zhang
- College of Automation, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, Zhejiang Province, China
| | - Miao Guo
- College of Automation, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, Zhejiang Province, China
| | - Yong Yang
- College of Automation, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, Zhejiang Province, China
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