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Thermal Annealing Effect on Structural, Morphological, and Sensor Performance of PANI-Ag-Fe Based Electrochemical E. coli Sensor for Environmental Monitoring. ScientificWorldJournal 2015; 2015:696521. [PMID: 26078996 PMCID: PMC4452879 DOI: 10.1155/2015/696521] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Accepted: 04/15/2015] [Indexed: 11/18/2022] Open
Abstract
PANI-Ag-Fe nanocomposite thin films based electrochemical E. coli sensor was developed with thermal annealing. PANI-Ag-Fe nanocomposite thin films were prepared by oxidative polymerization of aniline and the reduction process of Ag-Fe bimetallic compound with the presence of nitric acid and PVA. The films were deposited on glass substrate using spin-coating technique before they were annealed at 300°C. The films were characterized using XRD, UV-Vis spectroscopy, and FESEM to study the structural and morphological properties. The electrochemical sensor performance was conducted using I-V measurement electrochemical impedance spectroscopy (EIS). The sensitivity upon the presence of E. coli was measured in clean water and E. coli solution. From XRD analysis, the crystallite sizes were found to become larger for the samples after annealing. UV-Vis absorption bands for samples before and after annealing show maximum absorbance peaks at around 422 nm–424 nm and 426 nm–464 nm, respectively. FESEM images show the diameter size for nanospherical Ag-Fe alloy particles increases after annealing. The sensor performance of PANI-Ag-Fe nanocomposite thin films upon E. coli cells in liquid medium indicates the sensitivity increases after annealing.
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Adley CC. Past, Present and Future of Sensors in Food Production. Foods 2014; 3:491-510. [PMID: 28234333 PMCID: PMC5302250 DOI: 10.3390/foods3030491] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 07/18/2014] [Accepted: 07/21/2014] [Indexed: 12/16/2022] Open
Abstract
Microbial contamination management is a crucial task in the food industry. Undesirable microbial spoilage in a modern food processing plant poses a risk to consumers' health, causing severe economic losses to the manufacturers and retailers, contributing to wastage of food and a concern to the world's food supply. The main goal of the quality management is to reduce the time interval between the filling and the detection of a microorganism before release, from several days, to minutes or, at most, hours. This would allow the food company to stop the production, limiting the damage to just a part of the entire batch, with considerable savings in terms of product value, thereby avoiding the utilization of raw materials, packaging and strongly reducing food waste. Sensor systems offer major advantages over current systems as they are versatile and affordable but need to be integrated in the existing processing systems as a process analytical control (PAT) tool. The desire for good selectivity, low cost, portable and usable at working sites, sufficiently rapid to be used at-line or on-line, and no sample preparation devices are required. The application of biosensors in the food industry still has to compete with the standard analytical techniques in terms of cost, performance and reliability.
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Affiliation(s)
- Catherine C Adley
- Microbiology Laboratory, Department of Chemical and Environmental Sciences, University of Limerick, Limerick, Ireland.
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Aptasensor and genosensor methods for detection of microbes in real world samples. Methods 2013; 64:229-40. [PMID: 23872322 DOI: 10.1016/j.ymeth.2013.07.001] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 07/04/2013] [Accepted: 07/05/2013] [Indexed: 12/31/2022] Open
Abstract
The increasing concerns about food and environmental safety have prompted the desire to develop rapid, specific, robust and highly sensitive methods for the detection of microorganisms to ensure public health. Although traditional microbiological methods are available, they are labor intensive, unsuitable for on-site and high throughput analysis, and need well-trained personnel. To circumvent these drawbacks, many efforts have been devoted towards the development of biosensors, using nucleic acid as bio-recognition element. In this review, we will focus on recent significant advances made in two types of DNA-based biosensors, namely genosensors, and aptasensors. In genosensor approach, DNA or RNA target is detected through the hybridization reaction between DNA or RNA and ssDNA sensing element, while in aptasensor method, DNA or RNA aptamer, capable of binding to a target molecule with high affinity and specificity, plays the role of receptor. The goal of this article is to review the innovative methods that have been emerged in genosensor and aptasensor during recent years. Particular attention is given to recent advances and trends in selection of biorecognition element, DNA immobilization strategies and sensing formats.
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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.
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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.
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Tong Y, Deng Z. Modeling methods for identifying critical source areas of bacteria: recent developments and future perspectives. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2013; 85:259-269. [PMID: 23581241 DOI: 10.2175/106143012x13560205145217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Identification of critical source areas of bacteria in a watershed is essential to environmental management and restoration. As a result of the nonpoint and distributed nature of bacterial pollution in watersheds, it is often difficult to identify specific source areas of bacteria for remediation because bacteria collected from different sampling sites might display similar fingerprints. Over the past decade, extensive efforts have been made to identify microbial pollution sources, especially in watersheds. The primary objective of this study was to identify effective methods that can be applied to tracking critical source areas of bacteria in a watershed by a review of recent developments in several modeling methods. Comparisons of the models and their applications revealed that comprehensive watershed-scale source area tracking primarily involves two steps-geographical tracking and mathematical tracking. In terms of geographical tracking, bacterial source locations must be identified to prepare structural best management practices or low impact development for site treatments. For mathematical tracking, the quantity (strength) or release history of bacterial sources must be computed to develop total maximum daily loads (TMDLs) for bacterial load reduction and water quality restoration. Mathematically, source tracking is essentially an inverse modeling issue under uncertainty, requiring inverse modeling combined with a geostatistical method or an optimization algorithm. Consequently, combining biological methods, mathematical models, and sensor technologies (including remote sensing and in-situ sensing) provides an effective approach to identifying critical source locations of bacteria at the watershed-scale.
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Affiliation(s)
- Yangbin Tong
- Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803-6405, USA
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Lavecchia T, Rea G, Antonacci A, Giardi MT. Healthy and adverse effects of plant-derived functional metabolites: the need of revealing their content and bioactivity in a complex food matrix. Crit Rev Food Sci Nutr 2013; 53:198-213. [PMID: 23072533 PMCID: PMC3662084 DOI: 10.1080/10408398.2010.520829] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
In recent years, both food quality and its effect on human health have become a fundamental issue all over the world. As a consequence of this new and increased awareness, American, European, and Asian policymakers have strongly encouraged the research programs on food quality and safety thematic. Attempts to improve human health and to satisfy people's desire for healthcare without intake of pharmaceuticals, has led the food industry to focus attention on functional or nutraceutical food. For a long time, compounds with nutraceutical activity have been produced chemically, but the new demands for a sustainable life have gradually led the food industry to move towards natural compounds, mainly those derived from plants. Many phytochemicals are known to promote good health, but, sometimes, undesirable effects are also reported. Furthermore, several products present on the market show few benefits and sometimes even the reverse - unhealthy effects; the evidence of efficacy is often unconvincing and epidemiological studies are necessary to prove the truth of their claims. Therefore, there is a need for reliable analytical control systems to measure the bioactivity, content, and quality of these additives in the complex food matrix. This review describes the most widespread nutraceutics and an analytical control of the same using recently developed biosensors which are promising candidates for routine control of functional foods.
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Becker B, Cooper MA. A survey of the 2006-2009 quartz crystal microbalance biosensor literature. J Mol Recognit 2011; 24:754-87. [DOI: 10.1002/jmr.1117] [Citation(s) in RCA: 138] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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A DNA sequence-specific electrochemical biosensor based on alginic acid-coated cobalt magnetic beads for the detection of E. coli. Biosens Bioelectron 2011; 26:3325-30. [PMID: 21277764 DOI: 10.1016/j.bios.2011.01.007] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 01/04/2011] [Accepted: 01/05/2011] [Indexed: 11/22/2022]
Abstract
A new type of DNA sequence-specific electrochemical biosensor based on magnetic beads for the detection of Escherichia coli is reported in the present work. Alginic acid-coated cobalt magnetic beads, capped with 5'-(NH(2)) oligonucleotide and employed not only for magnetic separation but also as the solid adsorbent, were used as DNA probes to hybridize with the target E. coli DNA sequence. This assay was specific for E. coli detection depending on the uid A gene, which encodes for the enzyme β-d-glucuronidase produced by E. coli strains. When daunomycin (DNR) was used as DNA hybridization indicator, the target sequences of E. coli hybridized with the probes resulted in the decrease of DNR reduction peak current, which was proportional to the E. coli concentration. The optimization of the hybridization detection was carried out and the specificity of the probes was also demonstrated. This DNA biosensor can be employed to detect a complementary target sequence for 3.0×10(-10) mol/L and denatured PCR products for 0.5 ng/μL. The linear range of the developed biosensor for the detection of E. coli cells was from 1.0×10(2) to 2.0×10(3) cells/mL with a detection limit of 50 cells/mL. After a brief enrichment process, a concentration of 10 cells/mL E. coli in real water samples was detected by the electrochemical biosensor.
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Lavecchia T, Tibuzzi A, Giardi MT. Biosensors for Functional Food Safety and Analysis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2010; 698:267-81. [DOI: 10.1007/978-1-4419-7347-4_20] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
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DNA biosensors for the detection of aflatoxin producing Aspergillus flavus and A. parasiticus. MONATSHEFTE FUR CHEMIE 2009. [DOI: 10.1007/s00706-009-0137-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Sun H, Choy T, Zhu D, Yam W, Fung Y. Nano-silver-modified PQC/DNA biosensor for detecting E. coli in environmental water. Biosens Bioelectron 2009; 24:1405-10. [DOI: 10.1016/j.bios.2008.08.008] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2008] [Revised: 07/24/2008] [Accepted: 08/05/2008] [Indexed: 02/07/2023]
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Xia H, Wang F, Huang Q, Huang J, Chen M, Wang J, Yao C, Chen Q, Cai G, Fu W. Detection of Staphylococcus epidermidis by a Quartz Crystal Microbalance Nucleic Acid Biosensor Array Using Au Nanoparticle Signal Amplification. SENSORS 2008; 8:6453-6470. [PMID: 27873880 PMCID: PMC3707461 DOI: 10.3390/s8106453] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/02/2008] [Revised: 10/03/2008] [Accepted: 10/17/2008] [Indexed: 11/16/2022]
Abstract
Staphylococcus epidermidis is a critical pathogen of nosocomial blood infections, resulting in significant morbidity and mortality. A piezoelectric quartz crystal microbalance (QCM) nucleic acid biosensor array using Au nanoparticle signal amplification was developed to rapidly detect S. epidermidis in clinical samples. The synthesized thiolated probes specific targeting S. epidermidis 16S rRNA gene were immobilized on the surface of QCM nucleic acid biosensor arrays. Hybridization was induced by exposing the immobilized probes to the PCR amplified fragments of S. epidermidis, resulting in a mass change and a consequent frequency shift of the QCM biosensor. To further enhance frequency shift results from above described hybridizations, streptavidin coated Au nanoparticles were conjugated to the PCR amplified fragments. The results showed that the lowest detection limit of current QCM system was 1.3×103 CFU/mL. A linear correlation was found when the concentration of S. epidermidis varied from 1.3×103 to 1.3×107 CFU/mL. In addition, 55 clinical samples were detected with both current QCM biosensor system and conventional clinical microbiological method, and the sensitivity and specificity of current QCM biosensor system were 97.14% and 100%, respectively. In conclusion, the current QCM system is a rapid, low-cost and sensitive method that can be used to identify infection of S. epidermidis in clinical samples.
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Affiliation(s)
- Han Xia
- Department of Laboratory Medicine, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R China.
| | - Feng Wang
- Department of Laboratory Medicine, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R China.
| | - Qing Huang
- Department of Laboratory Medicine, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R China.
| | - Junfu Huang
- Department of Laboratory Medicine, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R China.
| | - Ming Chen
- Department of Laboratory Medicine, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R China.
| | - Jue Wang
- Department of Laboratory Medicine, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R China.
| | - Chunyan Yao
- Department of Laboratory Medicine, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R China.
| | - Qinghai Chen
- Department of Laboratory Medicine, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R China.
| | - Guoru Cai
- The 26th Research Institute, Chinese Electronic Scientific and Technical Group Company, Chongqing 400060, P.R China.
| | - Weiling Fu
- Department of Laboratory Medicine, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R China.
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