1
|
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.
Collapse
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.
| |
Collapse
|
2
|
Shivaram KB, Bhatt P, Verma MS, Clase K, Simsek H. Bacteriophage-based biosensors for detection of pathogenic microbes in wastewater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 901:165859. [PMID: 37516175 DOI: 10.1016/j.scitotenv.2023.165859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 07/25/2023] [Accepted: 07/26/2023] [Indexed: 07/31/2023]
Abstract
Wastewater is discarded from several sources, including industry, livestock, fertilizer application, and municipal waste. If the disposed of wastewater has not been treated and processed before discharge to the environment, pathogenic microorganisms and toxic chemicals are accumulated in the disposal area and transported into the surface waters. The presence of harmful microbes is responsible for thousands of human deaths related to water-born contamination every year. To be able to take the necessary step and quick action against the possible presence of harmful microorganisms and substances, there is a need to improve the effective speed of identification and treatment of these problems. Biosensors are such devices that can give quantitative information within a short period of time. There have been several biosensors developed to measure certain parameters and microorganisms. The discovered biosensors can be utilized for the detection of axenic and mixed microbial strains from the wastewaters. Biosensors can further be developed for specific conditions and environments with an in-depth understanding of microbial organization and interaction within that community. In this regard, bacteriophage-based biosensors have become a possibility to identify specific live bacteria in an infected environment. This paper has investigated the current scenario of microbial community analysis and biosensor development in identifying the presence of pathogenic microorganisms.
Collapse
Affiliation(s)
- Karthik Basthi Shivaram
- Department of Agricultural & Biological Engineering, Purdue University, West Lafayette, IN 47906, USA
| | - Pankaj Bhatt
- Department of Agricultural & Biological Engineering, Purdue University, West Lafayette, IN 47906, USA
| | - Mohit S Verma
- Department of Agricultural & Biological Engineering, Purdue University, West Lafayette, IN 47906, USA; Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47906, USA; Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA
| | - Kari Clase
- Department of Agricultural & Biological Engineering, Purdue University, West Lafayette, IN 47906, USA
| | - Halis Simsek
- Department of Agricultural & Biological Engineering, Purdue University, West Lafayette, IN 47906, USA.
| |
Collapse
|
3
|
Pani I, Sil S, Pal SK. Liquid Crystal Biosensors: A New Therapeutic Window to Point-of-Care Diagnostics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:909-917. [PMID: 36634050 DOI: 10.1021/acs.langmuir.2c02959] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
After revolutionizing the field of electro-optic displays, liquid crystals (LCs) are emerging as functional soft materials with wide-ranging biomedical implications. Integrating smart sensor designs with label-free imaging presents exciting opportunities in diagnostics. In this Perspective, we present an elegant collage of the key findings that demonstrate the utility of LC biosensors in diagnosing a disease or infection in clinical samples, cellular microenvironments, or bodily fluids. We emphasize the currently prevalent diagnostic techniques and the advances made using LCs in achieving greater sensitivity, a simplified strategy, multiplexed detection, and so on. We collate the landmark contributions in translational research in LC-based diagnostics. We believe that developing LC-based biosensors presents a new therapeutic window in point-of-care diagnostics.
Collapse
Affiliation(s)
- Ipsita Pani
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Mohali 140306, Punjab, India
| | - Soma Sil
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Mohali 140306, Punjab, India
| | - Santanu Kumar Pal
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Mohali 140306, Punjab, India
| |
Collapse
|
4
|
Varona M, Eor P, Ferreira Neto LC, Merib J, Anderson JL. Metal-containing and magnetic ionic liquids in analytical extractions and gas separations. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2021.116275] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
|
5
|
Wei JL, Huang DY, Chen YC. Using gadolinium ions as affinity probes to selectively enrich and magnetically isolate bacteria from complex samples. Anal Chim Acta 2020; 1113:18-25. [DOI: 10.1016/j.aca.2020.03.046] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Revised: 03/20/2020] [Accepted: 03/22/2020] [Indexed: 01/13/2023]
|
6
|
Jin CE, Koo B, Lee EY, Kim JY, Kim SH, Shin Y. Simple and label-free pathogen enrichment via homobifunctional imidoesters using a microfluidic (SLIM) system for ultrasensitive pathogen detection in various clinical specimens. Biosens Bioelectron 2018; 111:66-73. [PMID: 29653418 PMCID: PMC7125596 DOI: 10.1016/j.bios.2018.04.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 03/16/2018] [Accepted: 04/01/2018] [Indexed: 01/12/2023]
Abstract
Diseases caused by pathogenic microorganisms including bacteria and viruses can cause serious medical issues including death and result in huge economic losses. Despite the myriad of recent advances in the rapid and accurate detection of pathogens, large volume clinical samples with a low concentration of pathogens continue to present challenges for diagnosis and surveillance. We here report a simple and label-free approach via homobifunctional imidoesters (HIs) with a microfluidic platform (SLIM) to efficiently enrich and extract pathogens at low concentrations from clinical samples. The SLIM system consists of an assembled double microfluidic chip for streamlining large volume processing and HIs for capturing pathogens and isolating nucleic acids by both electrostatic and covalent interaction without a chaotropic detergent or bulky instruments. The SLIM system significantly increases the enrichment and extraction rate of pathogens (up to 80% at 10 CFU (colony forming unit) in a 1 mL volume within 50 min). We demonstrated its clinical utility in large sample volumes from 46 clinical specimens including environmental swabs, saliva, and blood plasma. The SLIM system showed higher sensitivity with these samples and could detect pathogens that were below the threshold of detection with other methods. Finally, by combining our SLIM approach with an isothermal optical sensor, pathogens could be detected at a very high sensitivity in blood plasma samples within 80 min via enrichment, extraction and detection steps. Our SLIM system thus provides a simple, reliable, cost-effective and ultrasensitive pathogen diagnosis platform for use with large volume clinical samples and would thus have significant utility for various infectious diseases. SLIM system significantly increases the enrichment and extraction rate of pathogens. Demonstrated its clinical utility in large sample volumes from 46 clinical specimens. A simple, reliable, cost-effective and ultrasensitive pathogen diagnosis platform.
Collapse
Affiliation(s)
- Choong Eun Jin
- Department of Convergence Medicine, Asan Medical Center, University of Ulsan College of Medicine, Biomedical Engineering Research Center, Asan Institute of Life Sciences, Asan Medical Center, 88 Olympicro-43gil, Songpa-gu, Seoul, Republic of Korea
| | - Bonhan Koo
- Department of Convergence Medicine, Asan Medical Center, University of Ulsan College of Medicine, Biomedical Engineering Research Center, Asan Institute of Life Sciences, Asan Medical Center, 88 Olympicro-43gil, Songpa-gu, Seoul, Republic of Korea
| | - Eun Yeong Lee
- Department of Convergence Medicine, Asan Medical Center, University of Ulsan College of Medicine, Biomedical Engineering Research Center, Asan Institute of Life Sciences, Asan Medical Center, 88 Olympicro-43gil, Songpa-gu, Seoul, Republic of Korea
| | - Ji Yeun Kim
- Department of Infectious Disease, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Sung-Han Kim
- Department of Infectious Disease, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
| | - Yong Shin
- Department of Convergence Medicine, Asan Medical Center, University of Ulsan College of Medicine, Biomedical Engineering Research Center, Asan Institute of Life Sciences, Asan Medical Center, 88 Olympicro-43gil, Songpa-gu, Seoul, Republic of Korea.
| |
Collapse
|
7
|
Clark KD, Purslow JA, Pierson SA, Nacham O, Anderson JL. Rapid preconcentration of viable bacteria using magnetic ionic liquids for PCR amplification and culture-based diagnostics. Anal Bioanal Chem 2017. [PMID: 28634762 DOI: 10.1007/s00216-017-0439-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In this study, a series of magnetic ionic liquids (MILs) were investigated for the extraction and preconcentration of bacteria from aqueous samples. By dispersing small volumes (e.g., 15 μL) of MIL within an aqueous cell suspension, bacteria were rapidly extracted and isolated using a magnetic field. Of the seven hydrophobic MILs examined, the trihexyl(tetradecyl)phosphonium Ni(II) hexafluoroacetylacetonate ([P66614+][Ni(hfacac)3-]) MIL exhibited the greatest enrichment of viable Escherichia coli K12 when coupled with microbiological culture as the detection method. The MIL-based strategy was applied for the preconcentration of E. coli from aqueous samples to obtain enrichment factors (E F) as high as 44.6 in less than 10 min. The MIL extraction approach was also interfaced with polymerase chain reaction (PCR) amplification where the positive detection of E. coli was achieved with the [P66614+][Co(hfacac)3-], [P66614+][Ni(hfacac)3-], [P66614+][Dy(hfacac)4-], and [P66614+][Nd(hfacac)4-] MILs. While direct sampling of an aqueous cell suspension at a concentration of 1.68 × 104 colony-forming units (CFUs) mL-1 yielded no amplicon when subjected to PCR, extraction of the sample with the [P66614+][Ni(hfacac)3-] MIL under optimized conditions provided sufficient enrichment of E. coli for amplicon detection. Importantly, the enrichment of bacteria using the Ni(II)-, Co(II)-, and Dy(III)-based MILs was compatible with real-time quantitative PCR amplification to dramatically improve sample throughput and lower detection limits to 1.0 × 102 CFUs mL-1. The MIL-based method is much faster than existing enrichment approaches that typically require 24-h cultivation times prior to detection and could potentially be applied for the preconcentration of a variety of Gram-negative bacteria from aqueous samples. Graphical abstract Magnetic ionic liquid solvents rapidly preconcentrate viable E. coli cells for unambiguous pathogen detection using microbiological culture and qPCR.
Collapse
Affiliation(s)
- Kevin D Clark
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, IA, 50011, USA
| | - Jeffrey A Purslow
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, IA, 50011, USA
| | - Stephen A Pierson
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, IA, 50011, USA
| | - Omprakash Nacham
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, IA, 50011, USA
| | - Jared L Anderson
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, IA, 50011, USA.
| |
Collapse
|
8
|
Vaisocherová-Lísalová H, Víšová I, Ermini ML, Špringer T, Song XC, Mrázek J, Lamačová J, Scott Lynn N, Šedivák P, Homola J. Low-fouling surface plasmon resonance biosensor for multi-step detection of foodborne bacterial pathogens in complex food samples. Biosens Bioelectron 2016; 80:84-90. [DOI: 10.1016/j.bios.2016.01.040] [Citation(s) in RCA: 156] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 01/12/2016] [Accepted: 01/13/2016] [Indexed: 11/25/2022]
|
9
|
Monzó J, Insua I, Fernandez-Trillo F, Rodriguez P. Fundamentals, achievements and challenges in the electrochemical sensing of pathogens. Analyst 2016; 140:7116-28. [PMID: 26339688 DOI: 10.1039/c5an01330e] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Electrochemical sensors are powerful tools widely used in industrial, environmental and medical applications. The versatility of electrochemical methods allows for the investigation of chemical composition in real time and in situ. Electrochemical detection of specific biological molecules is a powerful means for detecting disease-related markers. In the last 10 years, highly-sensitive and specific methods have been developed to detect waterborne and foodborne pathogens. In this review, we classify the different electrochemical techniques used for the qualitative and quantitative detection of pathogens. The robustness of electrochemical methods allows for accurate detection even in heterogeneous and impure samples. We present a fundamental description of the three major electrochemical sensing methods used in the detection of pathogens and the advantages and disadvantages of each of these methods. In each section, we highlight recent breakthroughs, including the utilisation of microfluidics, immunomagnetic separation and multiplexing for the detection of multiple pathogens in a single device. We also include recent studies describing new strategies for the design of future immunosensing systems and protocols. The high sensitivity and selectivity, together with the portability and the cost-effectiveness of the instrumentation, enhances the demand for further development in the electrochemical detection of microbes.
Collapse
Affiliation(s)
- Javier Monzó
- School of Chemistry, University of Birmingham, B15 2TT, UK.
| | | | | | | |
Collapse
|
10
|
Liu TY, Chen CL, Lee YC, Chan TY, Wang YL, Lin JJ. First Observation of Physically Capturing and Maneuvering Bacteria using Magnetic Clays. ACS APPLIED MATERIALS & INTERFACES 2016; 8:411-418. [PMID: 26686424 DOI: 10.1021/acsami.5b09192] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A new class of nanohybrids composed of structurally exfoliated silicate platelets and magnetic iron oxide nanoparticles was synthesized and shown to be capable of capturing microbes in liquid microbiological media. Nanoscale silicate platelets with an approximate thickness of 1.0 nm were prepared from the naturally occurring mineral clays montmorillonite and mica; these clays yielded platelets with lateral dimensions on the order of 80-100 nm and 300-1000 nm, respectively. The magnetic Fe3O4 nanoparticles, approximately 8.3 nm in diameter, were coated in situ onto the silicates during the synthesis process, which involved the coprecipitation of aqueous Fe(2+)/Fe(3+) salts. Owing to the high surface area-to-volume ratios and the presence of ionically charged groups (i.e., ≡SiO(-)Na(+)), the silicate nanoplatelets exhibited intense noncovalent bonding forces between Fe3O4 nanoparticles and the surrounding microorganisms. The Fe3O4-on-nanoplatelet nanohybrids enabled the entrapment of bacterial cells in liquid microbiological media. These captured bacteria formed bacterial aggregates on the order of micrometers that became physically maneuverable under a magnetic field. This phenomenon was demonstrated with Staphylococcus aureus in liquid microbiological media by physically removing them using a magnetic bar; in two experimental examples, bacterial concentrations were reduced from 10(6) to 10(2) and from 10(4) to 10(0) CFU/mL (colony formation unit/mL con). Under a scanning electron microscope, these bacteria appeared to have rough and wrinkled surfaces due to the accumulated silicate platelets. Furthermore, the external application of a high-frequency magnetic field completely destroyed these aggregated microbes by the magnetically induced heat. Hence, the newly developed nanohybrids were shown to be viable for physically capturing microbes and also for potential hyperthermia treatment applications.
Collapse
Affiliation(s)
- Ting-Yu Liu
- Department of Materials Engineering, Ming Chi University of Technology , New Taipei City 24301, Taiwan
| | - Chieh-Ling Chen
- Institute of Polymer Science and Engineering, National Taiwan University , Taipei 10617, Taiwan
| | - Yi-Chen Lee
- Institute of Polymer Science and Engineering, National Taiwan University , Taipei 10617, Taiwan
| | - Tzu-Yi Chan
- Department of Materials Engineering, Ming Chi University of Technology , New Taipei City 24301, Taiwan
| | - Yuh-Lin Wang
- Institute of Atomic and Molecular Sciences, Academia Sinica , Taipei 10617, Taiwan
- Department of Physics, National Taiwan University , Taipei 10617, Taiwan
| | - Jiang-Jen Lin
- Institute of Polymer Science and Engineering, National Taiwan University , Taipei 10617, Taiwan
| |
Collapse
|
11
|
Prévoteau A, Geirnaert A, Arends JBA, Lannebère S, Van de Wiele T, Rabaey K. Hydrodynamic chronoamperometry for probing kinetics of anaerobic microbial metabolism--case study of Faecalibacterium prausnitzii. Sci Rep 2015; 5:11484. [PMID: 26127013 PMCID: PMC4486957 DOI: 10.1038/srep11484] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 05/12/2015] [Indexed: 01/26/2023] Open
Abstract
Monitoring in vitro the metabolic activity of microorganisms aids bioprocesses and enables better understanding of microbial metabolism. Redox mediators can be used for this purpose via different electrochemical techniques that are either complex or only provide non-continuous data. Hydrodynamic chronoamperometry using a rotating disc electrode (RDE) can alleviate these issues but was seldom used and is poorly characterized. The kinetics of Faecalibacterium prausnitzii A2-165, a beneficial gut microbe, were determined using a RDE with riboflavin as redox probe. This butyrate producer anaerobically ferments glucose and reduces riboflavin whose continuous monitoring on a RDE provided highly accurate kinetic measurements of its metabolism, even at low cell densities. The metabolic reaction rate increased linearly over a broad range of cell concentrations (9 × 10(4) to 5 × 10(7) cells.mL(-1)). Apparent Michaelis-Menten kinetics was observed with respect to riboflavin (KM = 6 μM; kcat = 5.3 × 10(5) s(-1), at 37 °C) and glucose (KM = 6 μM; kcat = 2.4 × 10(5) s(-1)). The short temporal resolution allows continuous monitoring of fast cellular events such as kinetics inhibition with butyrate. Furthermore, we detected for the first time riboflavin reduction by another potential probiotic, Butyricicoccus pullicaecorum. The ability of the RDE for fast, accurate, simple and continuous measurements makes it an ad hoc tool for assessing bioprocesses at high resolution.
Collapse
Affiliation(s)
- Antonin Prévoteau
- Laboratory of Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Annelies Geirnaert
- Laboratory of Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Jan B A Arends
- Laboratory of Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Sylvain Lannebère
- University of Coimbra, Department of Electrical Engineering - Instituto de Telecomunicações, Coimbra 3030-290, Portugal
| | - Tom Van de Wiele
- Laboratory of Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Korneel Rabaey
- Laboratory of Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| |
Collapse
|
12
|
Hassan ARHAA, de la Escosura-Muñiz A, Merkoçi A. Highly sensitive and rapid determination of Escherichia coli O157:H7 in minced beef and water using electrocatalytic gold nanoparticle tags. Biosens Bioelectron 2015; 67:511-5. [DOI: 10.1016/j.bios.2014.09.019] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 08/19/2014] [Accepted: 09/05/2014] [Indexed: 12/20/2022]
|
13
|
Cloutier BC, Cloutier AK, Alocilja EC. Optimization of electrically active magnetic nanoparticles as accurate and efficient microbial extraction tools. BIOSENSORS-BASEL 2015; 5:69-84. [PMID: 25664527 PMCID: PMC4384083 DOI: 10.3390/bios5010069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Revised: 12/18/2014] [Accepted: 01/23/2015] [Indexed: 12/03/2022]
Abstract
Food defense requires the means to efficiently screen large volumes of food for microbial pathogens. Even rapid detection methods often require lengthy enrichment steps, making them impractical for this application. There is a great need for rapid, sensitive, specific, and inexpensive methods for extracting and concentrating microbial pathogens from food. In this study, an immuno-magnetic separation (IMS) methodology was developed for Escherichia coli O157:H7, using electrically active magnetic nanoparticles (EAMNPs). The analytical specificity of the IMS method was evaluated against Escherichia coli O55:H7 and Shigella boydii, and was improved over previous protocols by the addition of sodium chloride during the conjugation of antibodies onto MNPs. The analytical sensitivity of the IMS method was greatest when a high concentration of antibodies (1.0 mg/mL) was present during conjugation. EAMNP concentrations of 1.0 and 0.5 mg/mL provided optimal analytical sensitivity and analytical specificity. The entire IMS procedure requires only 35 min, and antibody-conjugated MNPs show no decline in performance up to 149 days after conjugation. This analytically sensitive and specific extraction protocol has excellent longevity and shows promise as an effective extraction for multiple electrochemical biosensor applications.
Collapse
Affiliation(s)
- Barbara C Cloutier
- Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, 275 Slappy Drive, Hamilton, GA 31811, USA.
- Department of Biosystems and Agricultural Engineering, Michigan State University, 115 Farrall Hall, East Lansing, MI 48824, USA.
| | - Ashley K Cloutier
- Department of Biosystems and Agricultural Engineering, Michigan State University, 115 Farrall Hall, East Lansing, MI 48824, USA.
| | - Evangelyn C Alocilja
- Department of Biosystems and Agricultural Engineering, Michigan State University, 115 Farrall Hall, East Lansing, MI 48824, USA.
| |
Collapse
|
14
|
Development of a rapid capture-cum-detection method for Escherichia coli O157 from apple juice comprising nano-immunomagnetic separation in tandem with surface enhanced Raman scattering. Int J Food Microbiol 2014; 189:89-97. [DOI: 10.1016/j.ijfoodmicro.2014.07.036] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 07/25/2014] [Accepted: 07/30/2014] [Indexed: 11/20/2022]
|
15
|
Yeni F, Acar S, Polat Ö, Soyer Y, Alpas H. Rapid and standardized methods for detection of foodborne pathogens and mycotoxins on fresh produce. Food Control 2014. [DOI: 10.1016/j.foodcont.2013.12.020] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
16
|
A highly selective biosensor with nanomolar sensitivity based on cytokinin dehydrogenase. PLoS One 2014; 9:e90877. [PMID: 24595403 PMCID: PMC3942484 DOI: 10.1371/journal.pone.0090877] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Accepted: 02/03/2014] [Indexed: 11/19/2022] Open
Abstract
We have developed a N6-dimethylallyladenine (cytokinin) dehydrogenase-based microbiosensor for real-time determination of the family of hormones known as cytokinins. Cytokinin dehydrogenase from Zea mays (ZmCKX1) was immobilised concurrently with electrodeposition of a silica gel film on the surface of a Pt microelectrode, which was further functionalized by free electron mediator 2,6-dichlorophenolindophenol (DCPIP) in supporting electrolyte to give a bioactive film capable of selective oxidative cleavage of the N6- side chain of cytokinins. The rapid electron shuffling between freely diffusible DCPIP and the FAD redox group in ZmCKX1 endowed the microbiosensor with a fast response time of less than 10 s. The immobilised ZmCKX1 retained a high affinity for its preferred substrate N6-(Δ2-isopentenyl) adenine (iP), and gave the miniaturized biosensor a large linear dynamic range from 10 nM to 10 µM, a detection limit of 3.9 nM and a high sensitivity to iP of 603.3 µAmM-1cm-2 (n = 4, R2 = 0.9999). Excellent selectivity was displayed for several other aliphatic cytokinins and their ribosides, including N6-(Δ2-isopentenyl) adenine, N6-(Δ2-isopentenyl) adenosine, cis-zeatin, trans-zeatin and trans-zeatin riboside. Aromatic cytokinins and metabolites such as cytokinin glucosides were generally poor substrates. The microbiosensors exhibited excellent stability in terms of pH and long-term storage and have been used successfully to determine low nanomolar cytokinin concentrations in tomato xylem sap exudates.
Collapse
|
17
|
Ondera TJ, Hamme AT. Gold Nanopopcorn Attached Single-Walled Carbon Nanotube Hybrid for Rapid Detection and Killing of Bacteria. J Mater Chem B 2014; 2:7534-7543. [PMID: 25414794 DOI: 10.1039/c4tb01195c] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
We report a strategy to fabricate a rapid and stable surface-enhanced Raman scattering (SERS)-based hybrid nanomaterial using gold nanopopcorns attached single-walled carbon nanotubes (AuNP@f3-SWCNTs) for label-free detection and photothermal killing of bacteria. Herein, previously ester-functionalized single-walled carbon nanotubes (f1-SWCNTs) undergo 1,3-dipolar cycloaddition reaction with in-situ generated nitrile imine under Microwave (MW) irradiation to form a doubly ester terminated SWCNTs cycloadduct (f2-SWCNTs). The ester terminals are further modified with 4-aminothiophenol (4-ATP) under MW-irradiation to form thiol-terminated SWCNTs templates (f3-SWCNTs) that allow gold nanopopcorns (AuNPs) to covalently and uniformly attach at a minimum inter-particle distance thus yielding a hybrid nanomaterial (AuNP@f3-SWCNT) with good aqueous stability and abundant 'hotspots'. Consequently, monoclonal E. coli antibody-conjugated bioassays fabricated with our AuNP@f3-SWCNT substrates (mAb-AuNP@f3-SWCNT) rapidly detect E. coli in water with good selectivity and impressive SERS sensitivity. The detection limit of E. coli 49979, selected as a model to establish proof of principle, was found to be 1.0×102 CFU/mL. Furthermore, the AuNP@f3-SWCNT hybrid nanomaterial offers impressive photothermal pathogen killing effects. The synergy-type enhancement effect arising from the inherent noble properties of the respective components of the hybrid nanomaterial indicate that our AuNP@f3-SWCNT has the potential for further application in multiplex detection in samples.
Collapse
Affiliation(s)
- Thomas J Ondera
- Department of Chemistry and Biochemistry, Jackson State University, 1400 J R Lynch street, Jackson, MS 39217, USA
| | - Ashton T Hamme
- Department of Chemistry and Biochemistry, Jackson State University, 1400 J R Lynch street, Jackson, MS 39217, USA
| |
Collapse
|
18
|
Paniel N, Baudart J. Colorimetric and electrochemical genosensors for the detection of Escherichia coli DNA without amplification in seawater. Talanta 2013; 115:133-42. [PMID: 24054570 DOI: 10.1016/j.talanta.2013.04.050] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Revised: 04/12/2013] [Accepted: 04/22/2013] [Indexed: 11/25/2022]
Abstract
Monitoring seawater, particularly recreational water, for indicator bacteria presence is required to protect the public from exposure to fecal pollution and to guarantee the safety of the swimming areas. Two methods for the detection and quantification of Escherichia coli DNA were developed: a colorimetric assay in a microplate and an electrochemical biosensor. These assays were based on the double hybridization recognition of a single-strand DNA capture probe immobilized onto the microplate or the screen-printed carbon electrode to its complementary ssDNA, which is hybridized with an ssDNA signal probe labeled with horseradish peroxidase enzyme. The hybridization recognition step used the colorimetric monitoring of the oxidation state of the 3,3',5,5'-tetramethylbenzidine. The electrochemical monitoring of the oxidation state of 5 methyl-phenazinium methyl sulfate was allowed when the horseradish-peroxidase was in the presence of the mediator (5 methyl-phenazinium methyl sulfate and hydrogen peroxide). These approaches allow for the detection and quantification of 10(2) to 10(3) cells of E. coli in 5l of seawater samples in less than 5h. Detection was achieved without a nucleic acid amplification step. The specificity of the two methods against E. coli was demonstrated by testing a panel of bacteria. The two methods can be used for on-site monitoring of seawater quality.
Collapse
Affiliation(s)
- Nathalie Paniel
- UPMC Univ Paris 06, UMR 7621, LOMIC, Observatoire Océanologique, F-66650, Banyuls/mer, France; CNRS, UMR 7621, LOMIC, Observatoire Océanologique, F-66650, Banyuls/mer, France.
| | | |
Collapse
|
19
|
Miyajima K, Koshida T, Arakawa T, Kudo H, Saito H, Yano K, Mitsubayashi K. Fiber-Optic Fluoroimmunoassay System with a Flow-Through Cell for Rapid On-Site Determination of Escherichia coli O157:H7 by Monitoring Fluorescence Dynamics. BIOSENSORS 2013; 3:120-31. [PMID: 25587403 PMCID: PMC4263595 DOI: 10.3390/bios3010120] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Revised: 02/13/2013] [Accepted: 03/05/2013] [Indexed: 11/17/2022]
Abstract
Dynamic fluoroimmunoassay with a flow-through system using optical fiber probes consisting of polystyrene was developed and applied to a quantitative detection of E. coli O157:H7. The system measures E. coli as fluorescence of sandwich-type immune complexes formed by capture antibodies immobilized on the surface of the probe, E. coli cells, and fluorescently labeled detection antibodies. Excitation was carried out using an evanescent wave from the probe. Resulting fluorescence recoupled into the probe was detected by a photodiode. The assay system was constructed with a flow cell which was available for sequential injection of experimental reagents. In vitro characterization was performed using the flow cell, and the calibration range of E. coli O157:H7 was from 10(3) to 10(7) cells/mL. The measurement for each sample was completed within 12 min. Furthermore, it was also possible to estimate the concentrations of E. coli O157:H7 by the increasing rate of fluorescence during binding reaction of detection antibodies to antigens. This minimized the time for measurement down to 6 min. The system is suitable for rapid and direct determination for microorganisms or bacteria in food, clinical, and environmental sources.
Collapse
Affiliation(s)
- Kumiko Miyajima
- Department of Advanced Sciences and Technology for Biomedical Sensors, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan; E-Mail: ; Department of Biomedical Devices and Instrumentation, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan; E-Mails: (T.A.); (H.K.)
| | - Tomoyuki Koshida
- Graduate School of Bionics, Tokyo University of Technology, 1404-1, Katakura-machi, Hachioji-shi, Tokyo 192-0982, Japan; E-Mails: (T.K.); (K.Y.)
| | - Takahiro Arakawa
- Department of Biomedical Devices and Instrumentation, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan; E-Mails: (T.A.); (H.K.)
| | - Hiroyuki Kudo
- Department of Biomedical Devices and Instrumentation, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan; E-Mails: (T.A.); (H.K.)
| | - Hirokazu Saito
- Department of Mechanical Engineering, Tokyo National Collage of Technology, 1220-2 Kunugida-machi, Hachioji-shi, Tokyo 193-0997, Japan; E-Mail:
| | - Kazuyoshi Yano
- Graduate School of Bionics, Tokyo University of Technology, 1404-1, Katakura-machi, Hachioji-shi, Tokyo 192-0982, Japan; E-Mails: (T.K.); (K.Y.)
| | - Kohji Mitsubayashi
- Department of Advanced Sciences and Technology for Biomedical Sensors, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan; E-Mail: ; Department of Biomedical Devices and Instrumentation, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan; E-Mails: (T.A.); (H.K.)
| |
Collapse
|
20
|
Wen CY, Hu J, Zhang ZL, Tian ZQ, Ou GP, Liao YL, Li Y, Xie M, Sun ZY, Pang DW. One-Step Sensitive Detection of Salmonella typhimurium by Coupling Magnetic Capture and Fluorescence Identification with Functional Nanospheres. Anal Chem 2013; 85:1223-30. [DOI: 10.1021/ac303204q] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Cong-Ying Wen
- Key Laboratory of Analytical
Chemistry for Biology and Medicine (Ministry of Education), College
of Chemistry and Molecular Sciences, State Key Laboratory of Virology,
and Wuhan Institute of Biotechnology, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Jun Hu
- Key Laboratory of Analytical
Chemistry for Biology and Medicine (Ministry of Education), College
of Chemistry and Molecular Sciences, State Key Laboratory of Virology,
and Wuhan Institute of Biotechnology, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Zhi-Ling Zhang
- Key Laboratory of Analytical
Chemistry for Biology and Medicine (Ministry of Education), College
of Chemistry and Molecular Sciences, State Key Laboratory of Virology,
and Wuhan Institute of Biotechnology, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Zhi-Quan Tian
- Key Laboratory of Analytical
Chemistry for Biology and Medicine (Ministry of Education), College
of Chemistry and Molecular Sciences, State Key Laboratory of Virology,
and Wuhan Institute of Biotechnology, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Guo-Ping Ou
- Department of Laboratory Medicine,
Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People’s
Republic of China
| | - Ya-Long Liao
- Department of Laboratory Medicine,
Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People’s
Republic of China
| | - Yong Li
- Key Laboratory of Analytical
Chemistry for Biology and Medicine (Ministry of Education), College
of Chemistry and Molecular Sciences, State Key Laboratory of Virology,
and Wuhan Institute of Biotechnology, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Min Xie
- Key Laboratory of Analytical
Chemistry for Biology and Medicine (Ministry of Education), College
of Chemistry and Molecular Sciences, State Key Laboratory of Virology,
and Wuhan Institute of Biotechnology, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Zi-Yong Sun
- Department of Laboratory Medicine,
Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People’s
Republic of China
| | - Dai-Wen Pang
- Key Laboratory of Analytical
Chemistry for Biology and Medicine (Ministry of Education), College
of Chemistry and Molecular Sciences, State Key Laboratory of Virology,
and Wuhan Institute of Biotechnology, Wuhan University, Wuhan 430072, People’s Republic of China
| |
Collapse
|
21
|
Kumar H, Rani R. Development of biosensors for the detection of biological warfare agents: its issues and challenges. Sci Prog 2013; 96:294-308. [PMID: 24244972 PMCID: PMC10365506 DOI: 10.3184/003685013x13777066241280] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This review discusses current development in biosensors for the detection of biological warfare agents (BWAs). BWAs include bacteria, virus and toxins that are added deliberately into air water and food to spread terrorism and cause disease or death. The rapid and unambiguous detection and identification of BWAs with early warning signals for detecting possible biological attack is a major challenge for government agencies particularly military and health. The detection devices--biosensors--can be classified (according to their physicochemical transducers) into four types: electrochemical, nucleic acid, optical and piezoelectric. Advantages and limitations of biosensors are discussed in this review followed by an assessment of the current state of development of different types of biosensors. The research and development in biosensors for biological warfare agent detection is of great interest for the public as well as for governments.
Collapse
Affiliation(s)
- Harish Kumar
- Department of Chemistry, Ch. Devi Lal University, Sirsa, Haryana 125 055, India.
| | | |
Collapse
|
22
|
Ivanova EP, Truong VK, Gervinskas G, Mitik-Dineva N, Day D, Jones RT, Crawford RJ, Juodkazis S. Highly selective trapping of enteropathogenic E. coli on Fabry-Pérot sensor mirrors. Biosens Bioelectron 2012; 35:369-375. [PMID: 22494541 DOI: 10.1016/j.bios.2012.03.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Revised: 03/07/2012] [Accepted: 03/12/2012] [Indexed: 11/29/2022]
Abstract
Untreated recycled water, such as sewage and graywater, will almost always contain a wide range of agents that are likely to present risks to human health, including chemicals and pathogenic microorganisms. The microbial hazards, such as large numbers of enteric pathogens that can cause gastroenteric illness if ingested, are the main cause of concern for human health. The presence of the enteropathogenic Escherichia coli (EPEC) serotype is of particular concern, as this group of bacteria is responsible for causing severe infant and travelers' diarrhea, gastroenteritis and hemolytic uremic syndrome. A biosensing system based on an optical Fabry-Pérot (FP) cavity, capable of directly detecting the presence of EPEC within 5 min, has been developed using a simple micro-thin double-sided adhesive tape and two semi-transparent FP mirror plates. The system utilizes a poly(methyl methacrylate) (PMMA) or glass substrates sputtered by 40-nm-thick gold thin films serving as FP mirrors. Mirrors have been activated using 0.1M mercaptopropionic acid, influencing an immobilization density of the translocated intimin receptor (TIR) of 100 ng/cm(2). The specificity of recognition was confirmed by exposing TIR functionalized surfaces to four taxonomically related and/or distantly related bacterial strains. It was found that the TIR-functionalized surfaces did not show any bacterial capture for these other bacterial strains within a 15 min incubation period.
Collapse
Affiliation(s)
- Elena P Ivanova
- Faculty of Life and Social Sciences, Swinburne University of Technology, PO Box 218, Hawthorn 3122, Australia.
| | - Vi Khanh Truong
- Faculty of Life and Social Sciences, Swinburne University of Technology, PO Box 218, Hawthorn 3122, Australia
| | - Gediminas Gervinskas
- Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, PO Box 218, Hawthorn 3122, Australia
| | - Natasa Mitik-Dineva
- Faculty of Life and Social Sciences, Swinburne University of Technology, PO Box 218, Hawthorn 3122, Australia
| | - Daniel Day
- Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, PO Box 218, Hawthorn 3122, Australia
| | - Robert T Jones
- Centre for Materials and Surface Science, Department of Physics, La Trobe University, Victoria 3086, Australia
| | - Russell J Crawford
- Faculty of Life and Social Sciences, Swinburne University of Technology, PO Box 218, Hawthorn 3122, Australia
| | - Saulius Juodkazis
- Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, PO Box 218, Hawthorn 3122, Australia; Melbourne Centre for Nanofabrication, 151 Wellington Road, Clayton, Victoria 3168, Australia
| |
Collapse
|
23
|
CHE YIHUA, YANG ZHONGPING, LI YANBIN, PAUL DAVID, SLAVIK MICHAEL. RAPID DETECTION OF SALMONELLA TYPHIMURIUM USING AN IMMUNOELECTROCHEMICAL METHOD COUPLED WITH IMMUNOMAGNETIC SEPARATION. ACTA ACUST UNITED AC 2011. [DOI: 10.1111/j.1745-4581.1999.tb00371.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
24
|
Setterington EB, Alocilja EC. Rapid electrochemical detection of polyaniline-labeled Escherichia coli O157:H7. Biosens Bioelectron 2011; 26:2208-14. [DOI: 10.1016/j.bios.2010.09.036] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 09/16/2010] [Accepted: 09/18/2010] [Indexed: 11/25/2022]
|
25
|
Shabani A, Zourob M, Allain B, Marquette CA, Lawrence MF, Mandeville R. Bacteriophage-modified microarrays for the direct impedimetric detection of bacteria. Anal Chem 2009; 80:9475-82. [PMID: 19072262 DOI: 10.1021/ac801607w] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel method is presented for the specific and direct detection of bacteria using bacteriophages as recognition receptors immobilized covalently onto functionalized screen-printed carbon electrode (SPE) microarrays. The SPE networks were functionalized through electrochemical oxidation in acidic media of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) by applying a potential of +2.2 V to the working electrode. Immobilization of T4 bacteriophage onto the SPEs was achieved via EDC by formation of amide bonds between the protein coating of the phage and the electrochemically generated carboxylic groups at the carbon surface. The surface functionalization with EDC, and the binding of phages, was verified by time-of-flight secondary ion mass spectrometry. The immobilized T4 phages were then used to specifically detect E. coli bacteria. The presence of surface-bound bacteria was verified by scanning electron and fluorescence microscopies. Impedance measurements (Nyquist plots) show shifts of the order of 10(4) Omega due to the binding of E. coli bacteria to the T4 phages. No significant change in impedance was observed for control experiments using immobilized T4 phage in the presence of Salmonella. Impedance variations as a function of incubation time show a maximum shift after 20 min, indicating onset of lysis, as also confirmed by fluorescence microscopy. Concentration-response curves yield a detection limit of 10(4) cfu/mL for 50-microL samples.
Collapse
|
26
|
Magnetic particle-based hybrid platforms for bioanalytical sensors. SENSORS 2009; 9:2976-99. [PMID: 22574058 PMCID: PMC3348820 DOI: 10.3390/s90402976] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2009] [Revised: 04/13/2009] [Accepted: 04/23/2009] [Indexed: 11/17/2022]
Abstract
Biomagnetic nano and microparticles platforms have attracted considerable interest in the field of biological sensors due to their interesting physico-chemical properties, high specific surface area, good mechanical stability and opportunities for generating magneto-switchable devices. This review discusses recent advances in the development and characterization of active biomagnetic nanoassemblies, their interaction with biological molecules and their use in bioanalytical sensors.
Collapse
|
27
|
Amperometric tyrosinase biosensor based on Fe3O4 nanoparticles-coated carbon nanotubes nanocomposite for rapid detection of coliforms. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2008.10.072] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
28
|
Hasebe Y, Fukuzawa M, Matsuhisa H. Quantitative determination of Escherichia coli based on the electrochemical measurement of bacterial catalase activity using H2O2-selective organic/inorganic-hybrid sol-gel film-modified Pt electrode. J Environ Sci (China) 2009; 21 Suppl 1:S44-S47. [PMID: 25084430 DOI: 10.1016/s1001-0742(09)60034-6] [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: 06/03/2023]
Abstract
Quantitative determination of Escherichia coli (E. coli) concentration was achieved by measuring the intrinsic catalase activity of E. coli using novel H2O2-selective organic/inorganic-hybrid sol-gel film-modified platinum (Pt) wire electrode. This hybrid sol-gel film is composed of three kinds of organosilanes and two biopolymers (i.e., chitosan and bovine serum albumin), and exhibited an excellent permselectivity toward H2O2 based on a size-exclusive mechanism. The steady-state anodic current for 100 [xmol/L H2O2 at +0.6 V (vs. Ag/AgCl) in 0.1 mol/L phosphate buffer (pH 6.5) solution was apparently diminished by the addition of E. coli samples, due to the decomposition of H2O2 by intrinsic catalase activity of E. coli. The time-dependent decrease in current (-AI/At) was significantly dependent on the E. coli concentration. The -AI/At was enhanced by the permeabilization pretreatment of E. coli samples with the mixed solution of polymyxin B and lysozyme. This H2O2-selective organic/inorganic-hybrid sol-gel film-modified platinum (Pt) wire electrode allowed quantitative determination of E. coli concentration ranging from 10(6) to 10(9) CFU/mL within 30 min. This method required no label and complicated procedure, and allowed rapid, simple and cost-effective quantitative electrochemical determination of catalase-positive bacteria.
Collapse
Affiliation(s)
- Yasushi Hasebe
- Department of Life Science and Green Chemistry, Faculty of Engineering, Saitama Institute of Technology, Fukaya, Saitama 369-0293, Japan; Department of Materials Science and Engineering, Graduate School of Engineering, Saitama Instite of Technology, Fukaya, Saitama 369-0293, Japan.
| | - Michiru Fukuzawa
- Department of Materials Science and Engineering, Graduate School of Engineering, Saitama Instite of Technology, Fukaya, Saitama 369-0293, Japan
| | - Hironori Matsuhisa
- Department of Materials Science and Engineering, Graduate School of Engineering, Saitama Instite of Technology, Fukaya, Saitama 369-0293, Japan
| |
Collapse
|
29
|
Andreescu S, Njagi J, Ispas C, Ravalli MT. JEM Spotlight: Applications of advanced nanomaterials for environmental monitoring. ACTA ACUST UNITED AC 2009; 11:27-40. [DOI: 10.1039/b811063h] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
30
|
Zhao J, Wang Z, Fu C, Wang M, He Q. The Mediated Electrochemical Method for Rapid Fermentation Ability Assessment. ELECTROANAL 2008. [DOI: 10.1002/elan.200804218] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
31
|
DUDAK FAHRİYECEYDA, BOYACI İSMAİLHAKKI. ENUMERATION OF IMMUNOMAGNETICALLY CAPTURED ESCHERICHIA COLI IN WATER SAMPLES USING QUANTUM DOT-LABELED ANTIBODIES. ACTA ACUST UNITED AC 2008. [DOI: 10.1111/j.1745-4581.2008.00120.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
32
|
Do J, Ahn CH. A polymer lab-on-a-chip for magnetic immunoassay with on-chip sampling and detection capabilities. LAB ON A CHIP 2008; 8:542-9. [PMID: 18369508 DOI: 10.1039/b715569g] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
This paper presents a new polymer lab-on-a-chip for magnetic bead-based immunoassay with fully on-chip sampling and detection capabilities, which provides a smart platform of magnetic immunoassay-based lab-on-a-chip for point-of-care testing (POCT) toward biochemical hazardous agent detection, food inspection or clinical diagnostics. In this new approach, the polymer lab-on-a-chip for magnetic bead-based immunoassay consists of a magnetic bead-based separator, an interdigitated array (IDA) micro electrode, and a microfluidic system, which are fully incorporated into a lab-on-a-chip on cyclic olefin copolymer (COC). Since the polymer lab-on-a-chip was realized using low cost, high throughput polymer microfabrication techniques such as micro injection molding and hot embossing method, a disposable polymer lab-on-a-chip for the magnetic bead-based immunoassay can be successfully realized in a disposable platform. With this newly developed polymer lab-on-a-chip, an enzyme-labelled electrochemical immunoassay (ECIA) was performed using magnetic beads as the mobile solid support, and the final enzyme product produced from the ECIA was measured using chronoamperometry. A sampling and detection of as low as 16.4 ng mL(-1) of mouse IgG has been successfully performed in 35 min for the entire procedure.
Collapse
Affiliation(s)
- Jaephil Do
- Microsystems and BioMEMS Laboratory, Center for BioMEMS and Nanobiosciences, Department of Electrical and Computer Engineering and Computer Science, University of Cincinnati, Cincinnati, OH 45221, USA.
| | | |
Collapse
|
33
|
Corr SA, Rakovich YP, Gun’ko YK. Multifunctional Magnetic-fluorescent Nanocomposites for Biomedical Applications. NANOSCALE RESEARCH LETTERS 2008. [PMCID: PMC3244791 DOI: 10.1007/s11671-008-9122-8] [Citation(s) in RCA: 243] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Nanotechnology is a fast-growing area, involving the fabrication and use of nano-sized materials and devices. Various nanocomposite materials play a number of important roles in modern science and technology. Magnetic and fluorescent inorganic nanoparticles are of particular importance due to their broad range of potential applications. It is expected that the combination of magnetic and fluorescent properties in one nanocomposite would enable the engineering of unique multifunctional nanoscale devices, which could be manipulated using external magnetic fields. The aim of this review is to present an overview of bimodal “two-in-one” magnetic-fluorescent nanocomposite materials which combine both magnetic and fluorescent properties in one entity, in particular those with potential applications in biotechnology and nanomedicine. There is a great necessity for the development of these multifunctional nanocomposites, but there are some difficulties and challenges to overcome in their fabrication such as quenching of the fluorescent entity by the magnetic core. Fluorescent-magnetic nanocomposites include a variety of materials including silica-based, dye-functionalised magnetic nanoparticles and quantum dots-magnetic nanoparticle composites. The classification and main synthesis strategies, along with approaches for the fabrication of fluorescent-magnetic nanocomposites, are considered. The current and potential biomedical uses, including biological imaging, cell tracking, magnetic bioseparation, nanomedicine and bio- and chemo-sensoring, of magnetic-fluorescent nanocomposites are also discussed.
Collapse
Affiliation(s)
- Serena A Corr
- The School of Chemistry, Trinity College, University of Dublin, Dublin, Ireland
| | - Yury P Rakovich
- The School of Physics, Trinity College, University of Dublin, Dublin, Ireland
| | - Yurii K Gun’ko
- The School of Chemistry, Trinity College, University of Dublin, Dublin, Ireland
| |
Collapse
|
34
|
Palchetti I, Mascini M. Electroanalytical biosensors and their potential for food pathogen and toxin detection. Anal Bioanal Chem 2008; 391:455-71. [DOI: 10.1007/s00216-008-1876-4] [Citation(s) in RCA: 134] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2007] [Revised: 01/08/2008] [Accepted: 01/10/2008] [Indexed: 10/22/2022]
|
35
|
Tokarskyy O, Marshall DL. Immunosensors for rapid detection of Escherichia coli O157:H7 — Perspectives for use in the meat processing industry. Food Microbiol 2008; 25:1-12. [DOI: 10.1016/j.fm.2007.07.005] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2007] [Accepted: 07/22/2007] [Indexed: 10/23/2022]
|
36
|
Obuchowska A. Quantitation of bacteria through adsorption of intracellular biomolecules on carbon paste and screen-printed carbon electrodes and voltammetry of redox-active probes. Anal Bioanal Chem 2008; 390:1361-71. [DOI: 10.1007/s00216-007-1825-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2007] [Revised: 11/29/2007] [Accepted: 12/20/2007] [Indexed: 10/22/2022]
|
37
|
Wang M, Zhao J, Yang Z, Du Z, Yang Z. Electrochemical insights into the ethanol tolerance of Saccharomyces cerevisiae. Bioelectrochemistry 2007; 71:107-12. [PMID: 17499559 DOI: 10.1016/j.bioelechem.2007.04.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2006] [Revised: 04/01/2007] [Accepted: 04/07/2007] [Indexed: 11/16/2022]
Abstract
It is expected that intracellular redox activity may closely related to catabolic states of living cells, based on which a mediated electrochemical method has been proposed to measure the ethanol tolerance of the yeast Saccharomyces cerevisiae AS 3800. The couple menadione/ferricyanide was employed as a carrier mediator system, sensing intracellular redox activity. Microelectrode voltammetric method was introduced to assay the ferrocyanide accumulations arising from menadione mediated reduction of ferricyanide by the yeast. The mediated electrochemical study show that the maximal ethanol tolerance limit of S. cerevisiae is about 25% (v/v) ethanol, which is consistent with the result obtained by the conventional fermentative ability measurement. Moreover, the electrochemical method for the first time confirmed that the specific activities of the glycolytic and alcohologenic enzymes within intact living cells remained high by the presence of sublethal ethanol, which was only predicted by in vitro enzymatic assay and cannot be measured by conventional method. The new method can be used as an easy and rapid method to determine the maximal ethanol tolerance of yeast cells.
Collapse
Affiliation(s)
- Min Wang
- School of Medicine, Ehime University, 791-0295 Toon, Japan
| | | | | | | | | |
Collapse
|
38
|
Dudak FC, Boyacı İH. Development of an immunosensor based on surface plasmon resonance for enumeration of Escherichia coli in water samples. Food Res Int 2007. [DOI: 10.1016/j.foodres.2007.01.011] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
39
|
Amperometric monitoring of redox activity in intact, permeabilised and lyophilised cells of the yeast Hansenula polymorpha. Electrochem commun 2007. [DOI: 10.1016/j.elecom.2007.02.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
|
40
|
IRWIN PETER, FORTIS LAURIE, CHAU LEE, TU SHUI. BUOYANCY-DEPENDENT IMB·SALMONELLACOMPLEX LOSSES DURING MAGNETIC PHASE SEPARATION1. ACTA ACUST UNITED AC 2007. [DOI: 10.1111/j.1745-4581.2002.tb00261.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
41
|
Corry JEL, Jarvis B, Passmore S, Hedges A. A critical review of measurement uncertainty in the enumeration of food micro-organisms. Food Microbiol 2007; 24:230-53. [PMID: 17188202 DOI: 10.1016/j.fm.2006.05.003] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2006] [Revised: 05/22/2006] [Accepted: 05/23/2006] [Indexed: 11/17/2022]
Abstract
Derivation of uncertainty provides a way to standardize the expression of variability associated with any analytical procedure. The published information on uncertainty associated with data obtained using microbiological procedures is reviewed to highlight the causes and magnitude of such variability in food microbiology. We also suggest statistical procedures that can be used to assess variability (and hence, uncertainty), within and between laboratories, including procedures that can be used routinely by microbiologists examining foods, and the use of 'robust' methods which allow the retention of 'outlying' data. Although concerned primarily with variability associated with colony count procedures, we discuss also the causes of variability in presence/absence and indirect methods, such as limiting dilution, most probable number and modern instrumental methods of microbiological examination. Recommendations are also made concerning the most important precautions to be taken in order to minimize uncertainty in microbiology. These include strict internal controls at all stages of microbiological testing, as well as validation of methods, trend analysis, use of reference materials and participation in proficiency testing schemes. It is emphasized that the distribution of microbes in foods is inherently heterogeneous, and that this review only addresses uncertainty of measurement with respect to the sample taken, not the lot or consignment of food from which the sample was taken.
Collapse
Affiliation(s)
- Janet E L Corry
- School of Clinical Veterinary Science, University of Bristol, Langford BS40 5DU, UK.
| | | | | | | |
Collapse
|
42
|
Mavré F, Bontemps M, Ammar-Merah S, Marchal D, Limoges B. Electrode surface confinement of self-assembled enzyme aggregates using magnetic nanoparticles and its application in bioelectrocatalysis. Anal Chem 2007; 79:187-94. [PMID: 17194138 DOI: 10.1021/ac061367a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Self-assembled enzyme aggregates, prepared from magnetic iron oxide nanoparticles, avidin, and a biotinylated redox enzyme, were shown particularly useful for the simple, fast, and efficient construction of highly enzyme-loaded electrodes with the help of a magnet. The approach was illustrated in the case of the bioelectrocatalytic oxidation of NADH by a diaphorase oxidoreductase in the presence of a ferrocene mediator. Two different self-assembling procedures were tested, taking advantage of the spontaneous aggregation of the nanoparticles in the presence of avidin and also of the multivalency binding of biotinylated diaphorase toward avidin. Activities of the bound and unbound diaphorase were systematically controlled allowing determination of the number of active biotinylated diaphorase per nanoparticle incorporated within each magnetic enzyme aggregate. An active enzyme loading capacity of up to 2.35 nmol mg-1 was found for the best nanostructured enzyme assembly, which is 200 times better than for commercialized magnetic micrometer-sized beads coated with streptavidin and saturated with diaphorase. With the help of a permanent magnet, the magnetic enzyme aggregates were finally magnetically collected as a film on the surface of a small screen-printed carbon electrode and the catalytic currents recorded by cyclic voltammetry. From the analysis of the steady-state catalytic current responses and the kinetic rate constants of biotinylated diaphorase, it was possible to determine the enzyme concentration within the magnetic films. Owing to the high enzyme loading in the aggregates of nanoparticles (i.e., 130 microM), the catalytic current responses were definitely higher than the ones measured at an electrode coated with a closed-packed monolayer of diaphorase or at an electrode covered with a film of magnetic micrometer-sized streptavidin beads saturated with diaphorase.
Collapse
Affiliation(s)
- François Mavré
- Laboratoire d' Electrochimie Moléculaire, UMR CNRS 7591, and Interfaces, Traitement, Organisation et Dynamiques des Systèmes (ITODYS), UMR CNRS 7086, Université de Paris 7, Denis Diderot, 2 place Jussieu, 75251 Paris Cedex 05, France
| | | | | | | | | |
Collapse
|
43
|
Lazcka O, Del Campo FJ, Muñoz FX. Pathogen detection: A perspective of traditional methods and biosensors. Biosens Bioelectron 2007; 22:1205-17. [PMID: 16934970 DOI: 10.1016/j.bios.2006.06.036] [Citation(s) in RCA: 804] [Impact Index Per Article: 47.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2006] [Revised: 05/15/2006] [Accepted: 06/30/2006] [Indexed: 11/26/2022]
Abstract
The detection of pathogenic bacteria is key to the prevention and identification of problems related to health and safety. Legislation is particularly tough in areas such as the food industry, where failure to detect an infection may have terrible consequences. In spite of the real need for obtaining analytical results in the shortest time possible, traditional and standard bacterial detection methods may take up to 7 or 8 days to yield an answer. This is clearly insufficient, and many researchers have recently geared their efforts towards the development of rapid methods. The advent of new technologies, namely biosensors, has brought in new and promising approaches. However, much research and development work is still needed before biosensors become a real and trustworthy alternative. This review not only offers an overview of trends in the area of pathogen detection but it also describes main techniques, traditional methods, and recent developments in the field of pathogen bacteria biosensors.
Collapse
Affiliation(s)
- Olivier Lazcka
- Instituto de Microelectrónica de Barcelona (IMB-CNM), CSIC, Campus Universitat Autónoma de Barcelona, Barcelona 08193, Spain
| | | | | |
Collapse
|
44
|
Rahman S, Lipert RJ, Porter MD. Rapid screening of pathogenic bacteria using solid phase concentration and diffuse reflectance spectroscopy. Anal Chim Acta 2006. [DOI: 10.1016/j.aca.2006.03.083] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
45
|
Liao JC, Mastali M, Gau V, Suchard MA, Møller AK, Bruckner DA, Babbitt JT, Li Y, Gornbein J, Landaw EM, McCabe ERB, Churchill BM, Haake DA. Use of electrochemical DNA biosensors for rapid molecular identification of uropathogens in clinical urine specimens. J Clin Microbiol 2006; 44:561-70. [PMID: 16455913 PMCID: PMC1392664 DOI: 10.1128/jcm.44.2.561-570.2006] [Citation(s) in RCA: 164] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We describe the first species-specific detection of bacterial pathogens in human clinical fluid samples using a microfabricated electrochemical sensor array. Each of the 16 sensors in the array consisted of three single-layer gold electrodes-working, reference, and auxiliary. Each of the working electrodes contained one representative from a library of capture probes, each specific for a clinically relevant bacterial urinary pathogen. The library included probes for Escherichia coli, Proteus mirabilis, Pseudomonas aeruginosa, Enterocococcus spp., and the Klebsiella-Enterobacter group. A bacterial 16S rRNA target derived from single-step bacterial lysis was hybridized both to the biotin-modified capture probe on the sensor surface and to a second, fluorescein-modified detector probe. Detection of the target-probe hybrids was achieved through binding of a horseradish peroxidase (HRP)-conjugated anti-fluorescein antibody to the detector probe. Amperometric measurement of the catalyzed HRP reaction was obtained at a fixed potential of -200 mV between the working and reference electrodes. Species-specific detection of as few as 2,600 uropathogenic bacteria in culture, inoculated urine, and clinical urine samples was achieved within 45 min from the beginning of sample processing. In a feasibility study of this amperometric detection system using blinded clinical urine specimens, the sensor array had 100% sensitivity for direct detection of gram-negative bacteria without nucleic acid purification or amplification. Identification was demonstrated for 98% of gram-negative bacteria for which species-specific probes were available. When combined with a microfluidics-based sample preparation module, the integrated system could serve as a point-of-care device for rapid diagnosis of urinary tract infections.
Collapse
Affiliation(s)
- Joseph C Liao
- Division of Infectious Diseases, 111F, VA Greater LA Healthcare, Los Angeles, CA 90073, USA
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Arora K, Chand S, Malhotra BD. Recent developments in bio-molecular electronics techniques for food pathogens. Anal Chim Acta 2006; 568:259-74. [PMID: 17761267 DOI: 10.1016/j.aca.2006.03.078] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2005] [Revised: 03/20/2006] [Accepted: 03/23/2006] [Indexed: 01/26/2023]
Abstract
Food borne illnesses contribute to the majority of infections caused by pathogenic microorganisms. Detection of these pathogens originating from different sources has led to increased interest of researchers. New bio-molecular techniques for food pathogen detection are being developed to improve the sensor characteristics such as sensitivity, reusability, simplicity and economic viability. Present article deals with the various methods of food pathogen detection with special emphasis on bio-molecular electronics techniques such as biosensors, microarrays, electronic nose, and nano-materials based methods.
Collapse
Affiliation(s)
- Kavita Arora
- Biomolecular Electronics and Conducting Polymer Research Group, National Physical Laboratory, K.S. Krishnan Road, New Delhi 110012, India.
| | | | | |
Collapse
|
47
|
Yang L, Li Y. Simultaneous detection of Escherichia coli O157∶H7 and Salmonella Typhimurium using quantum dots as fluorescence labels. Analyst 2006; 131:394-401. [PMID: 16496048 DOI: 10.1039/b510888h] [Citation(s) in RCA: 244] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we explored the use of semiconductor quantum dots (QDs) as fluorescence labels in immunoassays for simultaneous detection of two species of foodborne pathogenic bacteria, Escherichia coli O157:H7 and Salmonella Typhimurium. QDs with different sizes can be excited with a single wavelength of light, resulting in different emission peaks that can be measured simultaneously. Highly fluorescent semiconductor quantum dots with different emission wavelengths (525 nm and 705 nm) were conjugated to anti-E. coli O157 and anti-Salmonella antibodies, respectively. Target bacteria were separated from samples by using specific antibody coated magnetic beads. The bead-cell complexes reacted with QD-antibody conjugates to form bead-cell-QD complexes. Fluorescent microscopic images of QD labeled E. coli and Salmonella cells demonstrated that QD-antibody conjugates could evenly and completely attach to the surface of bacterial cells, indicating that the conjugated QD molecules still retain their effective fluorescence, while the conjugated antibody molecules remain active and are able to recognize their specific target bacteria in a complex mixture. The intensities of fluorescence emission peaks at 525 nm and 705 nm of the final complexes were measured for quantitative detection of E. coli O157:H7 and S. Typhimurium simultaneously. The fluorescence intensity (FI) as a function of cell number (N) was found for Salmonella and E. coli, respectively. The regression models can be expressed as: FI = 60.6 log N- 250.9 with R(2) = 0.97 for S. Typhimurium, and FI = 77.8 log N- 245.2 with R(2) = 0.91 for E. coli O157:H7 in the range of cell numbers from 10(4) to 10(7) cfu ml(-1). The detection limit of this method was 10(4) cfu ml(-1). The detection could be completed within 2 hours. The principle of this method could be extended to detect multiple species of bacteria (3-4 species) simultaneously, depending on the availability of each type of QD-antibody conjugates with a unique emission peak and the antibody coated magnetic beads specific to each species of bacteria.
Collapse
Affiliation(s)
- Liju Yang
- Department of Biological and Agricultural Engineering, Center of Excellence for Poultry Science, University of Arkansas, 203 Engineering Hall, Fayetteville, AR 72701, USA
| | | |
Collapse
|
48
|
Varshney M, Yang L, Su XL, Li Y. Magnetic nanoparticle-antibody conjugates for the separation of Escherichia coli O157:H7 in ground beef. J Food Prot 2005; 68:1804-11. [PMID: 16161677 DOI: 10.4315/0362-028x-68.9.1804] [Citation(s) in RCA: 142] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The immunomagnetic separation with magnetic nanoparticle-antibody conjugates (MNCs) was investigated and evaluated for the detection of Escherichia coli O157:H7 in ground beef samples. MNCs were prepared by immobilizing biotin-labeled polyclonal goat anti-E. coli antibodies onto streptavidin-coated magnetic nanoparticles. For bacterial separation, MNCs were mixed with inoculated ground beef samples, then nanoparticle-antibody-E. coli O157:H7 complexes were separated from food matrix with a magnet, washed, and surface plated for microbial enumeration. The capture efficiency was determined by plating cells bound to nanoparticles and unbound cells in the supernatant onto sorbitol MacConkey agar. Key parameters, including the amount of nanoparticles and immunoreaction time, were optimized with different concentrations of E. coli O157:H7 in phosphate-buffered saline. MNCs presented a minimum capture efficiency of 94% for E. coli O157:H7 ranging from 1.6 x 10(1) to 7.2 x 10(7) CFU/ml with an immunoreaction time of 15 min without any enrichment. Capture of E. coli O157:H7 by MNCs did not interfere with other bacteria, including Salmonella enteritidis, Citrobacter freundii, and Listeria monocytogenes. The capture efficiency values of MNCs increased from 69 to 94.5% as E. coli O157:H7 decreased from 3.4 x 10(7) to 8.0 x 10(0) CFU/ml in the ground beef samples prepared with minimal steps (without filtration and centrifugation). An enrichment of 6 h was done for 8.0 x 10(0) and 8.0 x 10(1) CFU/ml of E. coli O157:H7 in ground beef to increase the number of cells in the sample to a detectable level. The results also indicated that capture efficiencies of MNCs for E. coli O157:H7 with and without mechanical mixing during immunoreaction were not significantly different (P > 0.05). Compared with microbeads based immunomagnetic separation, the magnetic nanoparticles showed their advantages in terms of higher capture efficiency, no need for mechanical mixing, and minimal sample preparation.
Collapse
Affiliation(s)
- Madhukar Varshney
- Department of Biological and Agricultural Engineering, University of Arkansas, Fayetteville, Arkansas 72701, USA
| | | | | | | |
Collapse
|
49
|
Measurement of inhibitory effects of furfural and furfural alcohol using coupled redox mediators. Enzyme Microb Technol 2005. [DOI: 10.1016/j.enzmictec.2005.03.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
50
|
Delibato E, Bancone M, Volpe G, De Medici D, Moscone D, Palleschi G. Development and Comparative Evaluation of Different Screening Methods for Detection ofStaphylococcus aureus. ANAL LETT 2005. [DOI: 10.1081/al-200065797] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|