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Nikam PS, Palachandra S, Kingston JJ. In vitro selection and characterization of ssDNA aptamers by cross-over SELEX and its application for detection of S. Typhimurium. Anal Biochem 2022; 656:114884. [DOI: 10.1016/j.ab.2022.114884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 08/10/2022] [Accepted: 08/29/2022] [Indexed: 11/16/2022]
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2
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Hassan M, Vittal R, Raj JM, Chakraborty G. Loop-mediated isothermal amplification (LAMP): a sensitive molecular tool for detection of Staphylococcus aureus in meat and dairy product. Braz J Microbiol 2022; 53:341-347. [PMID: 35091898 PMCID: PMC8882521 DOI: 10.1007/s42770-021-00659-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 11/12/2021] [Indexed: 01/31/2023] Open
Abstract
Staphylococcus aureus-mediated food poisoning is a primary concern worldwide. The presence of the organism in food is an indicative of poor sanitation during production, and it is essential to have efficient methods for detecting this pathogen. A novel molecular diagnostic technique called loop-mediated isothermal amplification (LAMP) serves as a rapid and sensitive detection method, which amplifies nucleic acids at isothermal conditions. In this study, a LAMP-based diagnostic assay was developed to detect Staphylococcus aureus (S. aureus) using two target genes femA and arcC. The optimum reaction temperature was found to be 65 °C and at 60 °C for femA and arcC genes, respectively. The developed assay specifically amplified DNA from S. aureus, not from other related bacterial species and compared to PCR, and a 100-fold higher sensitivity was observed. Furthermore, the LAMP assay could detect the pathogen from food samples mainly meat and dairy samples when analyzed in both intact and enriched conditions. Thirteen samples were found positive for S. aureus with LAMP showing a greater number of positive samples in comparison to PCR. This study established a highly sensitive and a rapid diagnostic procedure for the detection and surveillance of this major foodborne pathogen.
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Affiliation(s)
- Manal Hassan
- grid.412206.30000 0001 0032 8661Nitte University Centre for Science Education and Research, Nitte (Deemed To Be University), Mangalore, India
| | - Rajeshwari Vittal
- grid.412206.30000 0001 0032 8661Nitte University Centre for Science Education and Research, Nitte (Deemed To Be University), Mangalore, India
| | - Juliet Mohan Raj
- grid.412206.30000 0001 0032 8661Nitte University Centre for Science Education and Research, Nitte (Deemed To Be University), Mangalore, India
| | - Gunimala Chakraborty
- grid.412206.30000 0001 0032 8661Nitte University Centre for Science Education and Research, Nitte (Deemed To Be University), Mangalore, India ,grid.412206.30000 0001 0032 8661Division of Molecular Genetics and Cancer, Nitte University Centre for Science Education and Research Paneer Campus, Nitte (Deemed To Be University), Karnataka 575 018 Mangalore, India
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3
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Magnetic nanocomposites: versatile tool for the combination of immunomagnetic separation with flow-based chemiluminescence immunochip for rapid biosensing of Staphylococcal enterotoxin B in milk. Anal Bioanal Chem 2019; 411:4951-4961. [DOI: 10.1007/s00216-019-01808-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 03/18/2019] [Accepted: 03/25/2019] [Indexed: 12/20/2022]
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4
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Dodoo CC, Stapleton P, Basit AW, Gaisford S. Use of a water-based probiotic to treat common gut pathogens. Int J Pharm 2018; 556:136-141. [PMID: 30543889 DOI: 10.1016/j.ijpharm.2018.11.075] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 11/28/2018] [Accepted: 11/30/2018] [Indexed: 01/16/2023]
Abstract
This work reports the anti-pathogenic effect of a commercially available water-based probiotic suspension, Symprove™, against three commonly encountered infectious organisms; Escherichia coli, methicillin-resistant Staphylococcus aureus (MRSA) and Shigella sonnei. An isothermal calorimetric assay was used to the monitor growth of the species individually and in binary combinations, while colony plate counting was used to enumerate viable cell numbers. It was observed that all pathogenic species were faster growing than the probiotic bacteria in Symprove™ after inoculation into growth medium yet in all instances bacterial enumeration at the end of the experiments revealed a significant reduction in the pathogen population compared with the controls. A control population between 108 and 109 CFU/ml was obtained for E. coli and S. sonnei whilst approximately 106 CFU/ml was obtained for MRSA. Upon co-incubation for 48 h, no viable counts were obtained for E. coli; a 4-log reduction was obtained for S. sonnei whilst MRSA numbers were down to less than 10 cells/ml. The results show that Symprove™ has antipathogenic activity against E. coli, S. sonnei and MRSA.
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Affiliation(s)
- Cornelius C Dodoo
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London WC1N 1AX, UK
| | - Paul Stapleton
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London WC1N 1AX, UK
| | - Abdul W Basit
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London WC1N 1AX, UK
| | - Simon Gaisford
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London WC1N 1AX, UK.
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Zhu X, Shen L, Liu J, Zhang C, Gu Q. Purification of a Bacteriocin from Lactobacillus plantarum ZJ217 Active Against Methicillin-Resistant Staphylococcus aureus. INTERNATIONAL JOURNAL OF FOOD ENGINEERING 2015. [DOI: 10.1515/ijfe-2014-0176] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Plantaricin ZJ217 was continually purified by XAD 1180, cation exchange chromatography, gel chromatography, and high performance liquid chromatography (HPLC) system. The peptide functioned as bactericidal, but did not lead to lysis of cells. Considering the potassium efflux experiment, pores may be formed in the surface of cell membrane. Fifteen of twenty amino acids identified by Edman degradation indicated that it may be a novel bacteriocin as no bacteriocin shared similar sequences. This bacteriocin exhibited strong heat stability (121°C, 30 min) and pH stability (pH 2.0–6.0). It was sensitive to proteinase K, trypsin, papain, and pepsin. This bacteriocin inhibited growth of methicillin-resistant Staphylococcus aureus (MRSA) and other bacteria.
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6
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Zhu X, Zhao Y, Sun Y, Gu Q. Purification and characterisation of plantaricin ZJ008, a novel bacteriocin against Staphylococcus spp. from Lactobacillus plantarum ZJ008. Food Chem 2014; 165:216-23. [PMID: 25038669 DOI: 10.1016/j.foodchem.2014.05.034] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 04/14/2014] [Accepted: 05/11/2014] [Indexed: 10/25/2022]
Abstract
A novel bacteriocin, plantaricin ZJ008 produced by Lactobacillus plantarum ZJ008 isolated from fresh milk, was purified by XAD 2, cation exchange chromatograph, gel chromatograph, and RP-HPLC. Mass spectrometry based on MALDI-TOF indicated that the bacteriocin had a molecular of 1334.77 Da. Only five of twenty amino acids could be identified by Edman degradation. This bacteriocin was highly thermostable (121°C, 30 min) and exhibited narrow pH stability (pH 4.0-5.0). It was sensitive to α-Chymotrypsin, trypsin, papain, and pepsin. However it still had 80% of activity after treatment by proteinase K. The action mode of this peptide functioned as bactericidal, but it did not lead to lysis of cells. This bacteriocin exhibited broad-spectrum antimicrobial activity against tested Gram-positive and Gram-negative bacteria, especially Staphylococcus spp. These results suggested that this bacteriocin appears potentially very useful to control and inhibit Staphylococcus spp. in the food industry.
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Affiliation(s)
- Xuan Zhu
- Zhejiang Gongshang University, Key Laboratory for Food Microbial Technology of Zhejiang Province, Hangzhou, Zhejiang Province, China
| | - Yizhen Zhao
- Zhejiang Gongshang University, Key Laboratory for Food Microbial Technology of Zhejiang Province, Hangzhou, Zhejiang Province, China
| | - Yalian Sun
- Zhejiang Gongshang University, Key Laboratory for Food Microbial Technology of Zhejiang Province, Hangzhou, Zhejiang Province, China
| | - Qing Gu
- Zhejiang Gongshang University, Key Laboratory for Food Microbial Technology of Zhejiang Province, Hangzhou, Zhejiang Province, China.
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7
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Balsam J, Bruck HA, Rasooly A. Capillary Array Waveguide Amplified Fluorescence Detector for mHealth. SENSORS AND ACTUATORS. B, CHEMICAL 2013; 186:711-717. [PMID: 24039345 PMCID: PMC3769705 DOI: 10.1016/j.snb.2013.06.030] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Mobile Health (mHealth) analytical technologies are potentially useful for carrying out modern medical diagnostics in resource-poor settings. Effective mHealth devices for underserved populations need to be simple, low cost, and portable. Although cell phone cameras have been used for biodetection, their sensitivity is a limiting factor because currently it is too low to be effective for many mHealth applications, which depend on detection of weak fluorescent signals. To improve the sensitivity of portable phones, a capillary tube array was developed to amplify fluorescence signals using their waveguide properties. An array configured with 36 capillary tubes was demonstrated to have a ~100X increase in sensitivity, lowering the limit of detection (LOD) of mobile phones from 1000 nM to 10 nM for fluorescein. To confirm that the amplification was due to waveguide behavior, we coated the external surfaces of the capillaries with silver. The silver coating interfered with the waveguide behavior and diminished the fluorescence signal, thereby proving that the waveguide behavior was the main mechanism for enhancing optical sensitivity. The optical configuration described here is novel in several ways. First, the use of capillaries waveguide properties to improve detection of weak florescence signal is new. Second we describe here a three dimensional illumination system, while conventional angular laser waveguide illumination is spot (or line), which is functionally one-dimensional illumination, can illuminate only a single capillary or a single column (when a line generator is used) of capillaries and thus inherently limits the multiplexing capability of detection. The planar illumination demonstrated in this work enables illumination of a two dimensional capillary array (e.g. x columns and y rows of capillaries). In addition, the waveguide light propagation via the capillary wall provides a third dimension for illumination along the axis of the capillaries. Such an array can potentially be used for sensitive analysis of multiple fluorescent detection assays simultaneously. The simple phone based capillary array approach presented in this paper is capable of amplifying weak fluorescent signals thereby improving the sensitivity of optical detectors based on mobile phones. This may allow sensitive biological assays to be measured with low sensitivity detectors and may make mHealth practical for many diagnostics applications, especially in resource-poor and global health settings.
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Affiliation(s)
- Joshua Balsam
- Division of Biology, Office of Science and Engineering, FDA, Silver Spring, MD 20993 ; University of Maryland, College Park, MD 20742
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8
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An overview of transducers as platform for the rapid detection of foodborne pathogens. Appl Microbiol Biotechnol 2013; 97:1829-40. [PMID: 23329385 DOI: 10.1007/s00253-013-4692-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Revised: 12/29/2012] [Accepted: 01/02/2013] [Indexed: 10/27/2022]
Abstract
The driving advent of portable, integrated biosensing ways for pathogen detection methods offers increased sensitivity and specificity over traditional microbiological techniques. The miniaturization and automation of integrated detection systems present a significant advantage for rapid, portable detection of foodborne microbes. In this review, we have highlighted current developments and directions in foodborne pathogen detection systems. Recent progress in the biosensor protocols toward the detection of specific microbes has been elaborated in detail. It also includes strategies and challenges for the implementation of a portable platform toward rapid foodborne sensing systems.
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9
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Loop-mediated isothermal amplification for detection of Staphylococcus aureus in dairy cow suffering from mastitis. J Biomed Biotechnol 2012; 2012:435982. [PMID: 23251078 PMCID: PMC3519349 DOI: 10.1155/2012/435982] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Revised: 11/07/2012] [Accepted: 11/07/2012] [Indexed: 11/17/2022] Open
Abstract
To develop a rapid detection method of Staphylococcus aureus using loop-mediated isothermal amplification (LAMP), four specific primers were designed according to six distinct sequences of the nuc gene. In addition, the specificity and sensitivity of LAMP were verified and compared with those of PCR. Results showed that the LAMP reaction was completed within 45 min at 62.5°C, and ladder bands were appeared in LAMP products analyzed by gel electrophoresis. After adding 1x SYBR Green l, the positive reaction tube showed green color and the negative reaction tube remained orange, indicating that the LAMP has high specificity. The minimal detectable concentration of LAMP was 1 × 10² CFU/mL and that of PCR was 1 × 10⁴ CFU/mL, indicating that the LAMP was 100 times more sensitive than the PCR. The LAMP method for detection of Staphylococcus aureus has many advantages, such as simple operation, high sensitivity, high specificity, and rapid analysis. Therefore, this method is more suitable for the rapid on-site detection of Staphylococcus aureus.
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11
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Yang H, Ma X, Zhang X, Wang Y, Zhang W. Development and evaluation of a loop-mediated isothermal amplification assay for the rapid detection of Staphylococcus aureus in food. Eur Food Res Technol 2011. [DOI: 10.1007/s00217-011-1442-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Yang M, Bruck HA, Kostov Y, Rasooly A. Biological semiconductor based on electrical percolation. Anal Chem 2010; 82:3567-72. [PMID: 20361741 DOI: 10.1021/ac902644z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have developed a novel biological semiconductor (BSC) based on electrical percolation through a multilayer three-dimensional carbon nanotube-antibody bionanocomposite network, which can measure biological interactions directly and electronically. In electrical percolation, the passage of current through the conductive network is dependent upon the continuity of the network. Molecular interactions, such as binding of antigens to the antibodies, disrupt the network continuity causing increased resistance of the network. A BSC is fabricated by immobilizing a prefunctionalized single-walled carbon nanotubes (SWNTs)-antibody bionanocomposite directly on a poly(methyl methacrylate) (PMMA) surface (also known as plexiglass or acrylic). We used the BSC for direct (label-free) electronic measurements of antibody-antigen binding, showing that, at slightly above the electrical percolation threshold of the network, binding of a specific antigen dramatically increases the electrical resistance. Using anti-staphylococcal enterotoxin B (SEB) IgG as a "gate" and SEB as an "actuator", we demonstrated that the BSC was able to detect SEB at concentrations of 1 ng/mL. The new BSCs may permit assembly of multiple sensors on the same chip to create "biological central processing units (CPUs)" with multiple BSC elements, capable of processing and sorting out information on multiple analytes simultaneously.
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Affiliation(s)
- Minghui Yang
- Center for Advanced Sensor Technology, University of Maryland, Baltimore County, Maryland 21250, USA
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13
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Yang M, Sun S, Bruck HA, Kostov Y, Rasooly A. Electrical percolation-based biosensor for real-time direct detection of staphylococcal enterotoxin B (SEB). Biosens Bioelectron 2010; 25:2573-8. [PMID: 20447819 PMCID: PMC2996829 DOI: 10.1016/j.bios.2010.04.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2010] [Revised: 04/14/2010] [Accepted: 04/15/2010] [Indexed: 11/20/2022]
Abstract
Electrical percolation-based biosensing is a new technology. This is the first report of an electrical percolation-based biosensor for real-time detection. The label-free biosensor is based on electrical percolation through a single-walled carbon nanotubes (SWNTs)-antibody complex that forms a network functioning as a "Biological Semiconductor" (BSC). The conductivity of a BSC is directly related to the number of contacts facilitated by the antibody-antigen "connectors" within the SWNT network. BSCs are fabricated by immobilizing a pre-functionalized SWNTs-antibody complex directly on a poly(methyl methacrylate) (PMMA) and polycarbonate (PC) surface. Each BSC is connected via silver electrodes to a computerized ohmmeter, thereby enabling a continuous electronic measurement of molecular interactions (e.g. antibody-antigen binding) via the change in resistance. Using anti-staphylococcal enterotoxin B (SEB) IgG to functionalize the BSC, we demonstrate that the biosensor was able to detect SEB at concentrations as low as 5 ng/mL at a signal to baseline (S/B) ratio of 2. Such measurements were performed on the chip in wet conditions. The actuation of the chip by SEB is immediate, permitting real-time signal measurements. In addition to this "direct" label-free detection mode, a secondary antibody can be used to "label" the target molecule bound to the BSC in a manner analogous to an immunological sandwich "indirect" detection-type assay. Although a secondary antibody is not needed for direct detection, the indirect mode of detection may be useful as an additional measurement to verify or amplify signals from direct detection in clinical, food safety and other critical assays. The BSC was used to measure SEB both in buffer and in milk, a complex matrix, demonstrating the potential of electrical percolation-based biosensors for real-time label-free multi-analyte detection in clinical and complex samples. Assembly of BSCs is simple enough that multiple sensors can be fabricated on the same chip, thereby creating "Biological Central Processing Units (BCPUs)" capable of parallel processing and sorting out information on multiple analytes simultaneously which may be used for complex analysis and for point of care diagnostics.
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Affiliation(s)
- Minghui Yang
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, MD 21250
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Steven Sun
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, MD 21250
- Division of Biology, Office of Science and Engineering, FDA, Silver Spring, MD 20993
| | - Hugh Alan Bruck
- University of Maryland College Park (UMCP), College Park MD 20742
| | - Yordan Kostov
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, MD 21250
| | - Avraham Rasooly
- Division of Biology, Office of Science and Engineering, FDA, Silver Spring, MD 20993
- National Cancer Institute, Bethesda, MD 20892
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Multiplexed magnetic microsphere immunoassays for detection of pathogens in foods. ACTA ACUST UNITED AC 2010; 4:73-81. [PMID: 20953301 DOI: 10.1007/s11694-010-9097-x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Foodstuffs have traditionally been challenging matrices for conducting immunoassays. Proteins, carbohydrates, and other macromolecules present in food matrices may interfere with both immunoassays and PCR-based tests, and removal of particulate matter may also prove challenging prior to analyses. This has been found true when testing for bacterial contamination of foods using the standard polystyrene microspheres utilized with Luminex flow cytometers. Luminex MagPlex microspheres are encoded with the same dyes as standard xMAP microspheres, but have superparamagnetic properties to aid in preparation of samples in complex matrices. In this work, we present results demonstrating use of MagPlex for sample preparation and identification of bacteria and a toxin spiked into a variety of food samples. Fluorescence-coded MagPlex microsphere sets coated with antibodies for Salmonella, Campylobacter, Escherichia coli, Listeria, and staphylococcal enterotoxin B (SEB) were used to capture these bacteria and toxin from spiked foodstuffs and then evaluated by the Luminex system in a multiplex format; spiked foods included apple juice, green pepper, tomato, ground beef, alfalfa sprouts, milk, lettuce, spinach, and chicken washes. Although MagPlex microspheres facilitated recovery of the microspheres and targets from the complex matrices, assay sensitivity was sometimes inhibited by up to one to three orders of magnitude; for example the detection limits E. coli spiked into apple juice or milk increased 100-fold, from 1000 to 100,000 cfu/mL. Thus, while the magnetic and fluorescent properties of the Luminex MagPlex microspheres allow for rapid, multiplexed testing for bacterial contamination in typically problematic food matrices, our data demonstrate that achieving desired limits of detection is still a challenge.
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Wojciechowski J, Danley D, Cooper J, Yazvenko N, Taitt CR. Multiplexed electrochemical detection of Yersinia pestis and staphylococcal enterotoxin B using an antibody microarray. SENSORS (BASEL, SWITZERLAND) 2010; 10:3351-62. [PMID: 22319302 PMCID: PMC3274223 DOI: 10.3390/s100403351] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2010] [Revised: 02/28/2010] [Accepted: 03/26/2010] [Indexed: 11/24/2022]
Abstract
The CombiMatrix antibody microarray is a versatile, sensitive detection platform based on the generation and transduction of electrochemical signals following antigen binding to surface antibodies. The sensor chip described herein is comprised of microelectrodes coupled to an adjacent bio-friendly matrix coated with antibodies to the biological pathogens Yersinia pestis and Bacillus anthracis, and the bacterial toxin staphylococcal enterotoxin B (SEB). Using this system, we were able to detect SEB and inactivated Y. pestis individually as well as in two-plex assays at concentrations as low as 5 pg/mL and 10(6) CFU/mL, respectively. We also introduce super avidin-biotin system (SABS) as a viable and effective means to enhance assay signal responses and lower detection limits. Together these technologies represent substantial advances in point-of-care and point-of-use detection applications.
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Affiliation(s)
- Jason Wojciechowski
- Center for Bio, Molecular Science and Engineering, Bld. 30, US Naval Research Laboratory, 4555 Overlook Ave. SW, Washington DC 20376, USA; E-Mail:
| | - David Danley
- CombiMatrix Corporation, 6500 Harbour Heights Pkwy., Suite #303, Mukilteo, WA 98275, USA; E-Mails: (D.D.); (J.C.); (N.Y.)
| | - John Cooper
- CombiMatrix Corporation, 6500 Harbour Heights Pkwy., Suite #303, Mukilteo, WA 98275, USA; E-Mails: (D.D.); (J.C.); (N.Y.)
| | - Nina Yazvenko
- CombiMatrix Corporation, 6500 Harbour Heights Pkwy., Suite #303, Mukilteo, WA 98275, USA; E-Mails: (D.D.); (J.C.); (N.Y.)
| | - Chris Rowe Taitt
- Center for Bio, Molecular Science and Engineering, Bld. 30, US Naval Research Laboratory, 4555 Overlook Ave. SW, Washington DC 20376, USA; E-Mail:
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Yang M, Kostov Y, Bruck HA, Rasooly A. Gold nanoparticle-based enhanced chemiluminescence immunosensor for detection of Staphylococcal Enterotoxin B (SEB) in food. Int J Food Microbiol 2009; 133:265-71. [PMID: 19540011 DOI: 10.1016/j.ijfoodmicro.2009.05.029] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2008] [Revised: 05/26/2009] [Accepted: 05/27/2009] [Indexed: 10/20/2022]
Abstract
Staphylococcal enterotoxins (SEs) are major cause of foodborne diseases, so sensitive detection (<1 ng/ml) methods are needed for SE detection in food. The surface area, geometric and physical properties of gold nanoparticles make them well-suited for enhancing interactions with biological molecules in assays. To take advantage of the properties of gold nanoparticles for immunodetection, we have developed a gold nanoparticle-based enhanced chemiluminescence (ECL) immunosensor for detection of Staphylococcal Enterotoxin B (SEB) in food. Anti-SEB primary antibodies were immobilized onto a gold nanoparticle surface through physical adsorption and then the antibody-gold nanoparticle mixture was immobilized onto a polycarbonate surface. SEB was detected by a "sandwich-type" ELISA assay on the polycarbonate surface with a secondary antibody and ECL detection. The signal from ECL was read using a point-of-care detector based on a cooled charge-coupled device (CCD) sensor or a plate reader. The system was used to test for SEB in buffer and various foods (mushrooms, tomatoes, and baby food meat). The limit of detection was found to be approximately 0.01 ng/mL, which is approximately 10 times more sensitive than traditional ELISA. The gold nanoparticles were relatively easy to use for antibody immobilization because of their physical adsorption mechanism; no other reagents were required for immobilization. The use of our simple and inexpensive detector combined with the gold nanoparticle-based ECL method described here is adaptable to simplify and increase sensitivity of any immunological assay and for point-of-care diagnostics.
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Affiliation(s)
- Minghui Yang
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, MD 21250, USA
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17
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de Souza EL, de Barros JC, da Conceição ML, Neto NJG, da Costa ACV. Combined application of origanum vulgare l. essential oil and acetic acid for controlling the growth of staphylococcus aureus in foods. Braz J Microbiol 2009; 40:387-93. [PMID: 24031377 PMCID: PMC3769715 DOI: 10.1590/s1517-838220090002000032] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2008] [Revised: 08/16/2008] [Accepted: 03/31/2009] [Indexed: 11/22/2022] Open
Abstract
This study evaluated the occurrence of an enhancing inhibitory effect of the combined application of Origanum vulgare L. essential oil and acetic acid against Staphylococcus aureus by the determination of Fractional Inhibitory Concentration (FIC) index and kill-time assay in nutrient broth, meat broth and in a food model (meat pieces). Acetic acid showed MIC and MFC of 0.6 and 1.25 μL.mL-1, respectively. For O. vulgare essential oil MIC and MBC were 1.25 and 2.5 μL.mL-1, respectively. FIC indexes of the mixture of essential oil and acetic acid at MIC x ½ were ≤ 1.0, showing an additive effect. No synergy was found at kill-time study. Anti-staphylococcal effect of the antimicrobials alone or in mixture (MIC x ½) was lower in meat than in nutrient and meat broths. The effective combination of essential oils and organic acids could appear as an attractive alternative for the food industry, as the doses to inhibit the microbial growth in foods can be lowered.
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Affiliation(s)
- Evandro Leite de Souza
- Laboratório de Microbiologia de Alimentos, Departamento de Nutrição, Centro de Ciências da Saúde, Universidade Federal da Paraíba, João Pessoa , Paraíba , Brasil
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18
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Wojciechowski JR, Shriver-Lake LC, Yamaguchi MY, Füreder E, Pieler R, Schamesberger M, Winder C, Prall HJ, Sonnleitner M, Ligler FS. Organic Photodiodes for Biosensor Miniaturization. Anal Chem 2009; 81:3455-61. [DOI: 10.1021/ac8027323] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jason R. Wojciechowski
- Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, and NanoIdent Technologies AG, Untere Donaulande 21-25, A-4020 Linz, Austria
| | - Lisa C. Shriver-Lake
- Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, and NanoIdent Technologies AG, Untere Donaulande 21-25, A-4020 Linz, Austria
| | - Mariko Y. Yamaguchi
- Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, and NanoIdent Technologies AG, Untere Donaulande 21-25, A-4020 Linz, Austria
| | - Erwin Füreder
- Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, and NanoIdent Technologies AG, Untere Donaulande 21-25, A-4020 Linz, Austria
| | - Roland Pieler
- Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, and NanoIdent Technologies AG, Untere Donaulande 21-25, A-4020 Linz, Austria
| | - Martin Schamesberger
- Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, and NanoIdent Technologies AG, Untere Donaulande 21-25, A-4020 Linz, Austria
| | - Christoph Winder
- Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, and NanoIdent Technologies AG, Untere Donaulande 21-25, A-4020 Linz, Austria
| | - Hans Jürgen Prall
- Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, and NanoIdent Technologies AG, Untere Donaulande 21-25, A-4020 Linz, Austria
| | - Max Sonnleitner
- Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, and NanoIdent Technologies AG, Untere Donaulande 21-25, A-4020 Linz, Austria
| | - Frances S. Ligler
- Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, and NanoIdent Technologies AG, Untere Donaulande 21-25, A-4020 Linz, Austria
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19
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Sapsford KE, Francis J, Sun S, Kostov Y, Rasooly A. Miniaturized 96-well ELISA chips for staphylococcal enterotoxin B detection using portable colorimetric detector. Anal Bioanal Chem 2009; 394:499-505. [PMID: 19290511 DOI: 10.1007/s00216-009-2730-z] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2009] [Revised: 02/20/2009] [Accepted: 02/23/2009] [Indexed: 10/21/2022]
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20
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Golden JP, Sapsford KE. Fluoroimmunoassays using the NRL array biosensor. Methods Mol Biol 2009; 503:273-292. [PMID: 19151947 DOI: 10.1007/978-1-60327-567-5_15] [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: 05/27/2023]
Abstract
Array-based biosensor technology offers the user the ability to detect and quantify multiple targets in multiple samples simultaneously (Analytical Sciences 23:5-10, 2007). The NRL Array Biosensor has been developed with the aim of creating a system for sensitive, rapid, on-site screening for multiple targets of interest. This system is fluorescence-based, using evanescent illumination of a waveguide, and has demonstrated the use of both sandwich and competitive immunoassays for the detection of both high and low molecular weight targets, respectively. The current portable, automated system has demonstrated detection of a wide variety of analytes ranging from simple chemical compounds to entire bacterial cells, with applications in food safety, disease diagnosis, homeland security and environmental monitoring.
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Affiliation(s)
- Joel P Golden
- Center for Bio/Molecular Science & Engineering, US Naval Research Laboratory, Washington, DC, USA
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21
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Taitt CR, Shriver-Lake LC, Ngundi MM, Ligler FS. Array Biosensor for Toxin Detection: Continued Advances. SENSORS 2008; 8:8361-8377. [PMID: 27873991 PMCID: PMC3791022 DOI: 10.3390/s8128361] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2008] [Revised: 11/26/2008] [Accepted: 12/09/2008] [Indexed: 11/17/2022]
Abstract
The following review focuses on progress made in the last five years with the NRL Array Biosensor, a portable instrument for rapid and simultaneous detection of multiple targets. Since 2003, the Array Biosensor has been automated and miniaturized for operation at the point-of-use. The Array Biosensor has also been used to demonstrate (1) quantitative immunoassays against an expanded number of toxins and toxin indicators in food and clinical fluids, and (2) the efficacy of semi-selective molecules as alternative recognition moieties. Blind trials, with unknown samples in a variety of matrices, have demonstrated the versatility, sensitivity, and reliability of the automated system.
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Affiliation(s)
- Chris Rowe Taitt
- Center for Bio/Molecular Science & Engineering, Naval Research Laboratory, Code 6900, Washington, DC 20375-5348, USA.
| | - Lisa C Shriver-Lake
- Center for Bio/Molecular Science & Engineering, Naval Research Laboratory, Code 6900, Washington, DC 20375-5348, USA.
| | - Miriam M Ngundi
- Food and Drug Administration, N29 RM418 HFM-434, 8800 Rockville Pike, Bethesda, MD 20892, USA.
| | - Frances S Ligler
- Center for Bio/Molecular Science & Engineering, Naval Research Laboratory, Code 6900, Washington, DC 20375-5348, USA.
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22
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Yang M, Kostov Y, Bruck HA, Rasooly A. Carbon nanotubes with enhanced chemiluminescence immunoassay for CCD-based detection of Staphylococcal enterotoxin B in food. Anal Chem 2008; 80:8532-7. [PMID: 18855418 PMCID: PMC2845180 DOI: 10.1021/ac801418n] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Enhanced chemiluminescence (ECL) detection can significantly enhance the sensitivity of immunoassays but often requires expensive and complex detectors. The need for these detectors limits broader use of ECL in immunoassay applications. To make ECL more practical for immunoassays, we utilize a simple cooled charge-coupled device (CCD) detector combined with carbon nanotubes (CNTs) for primary antibody immobilization to develop a simple and portable point-of-care immunosensor. This combination of ECL, CNT, and CCD detector technologies is used to improve the detection of Staphylococcal enterotoxin B (SEB) in food. Anti-SEB primary antibodies were immobilized onto the CNT surface, and the antibody-nanotube mixture was immobilized onto a polycarbonate surface. SEB was then detected by an ELISA assay on the CNT-polycarbonate surface with an ECL assay. SEB in buffer, soy milk, apple juice, and meat baby food was assayed with a LOD of 0.01 ng/mL using our CCD detector, a level similar to the detection limit obtained with a fluorometric detector when using the CNTs. This level is far more sensitive than the conventional ELISA, which has a LOD of approximately 1 ng/mL. Our simple, versatile, and inexpensive point-of-care immunosensor combined with the CNT-ECL immunoassay method described in this work can also be used to simplify and increase sensitivity for many other types of diagnostics and detection assays.
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Affiliation(s)
| | | | | | - Avraham Rasooly
- To whom correspondence should be addressed. Mail: NIH/NCI, 6130 Executive Blvd. EPN, Room 6035A, Rockville, MD 20852. Phone: (301) 402-4185. Fax: (301) 402-7819.
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23
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Surface plasmon resonance and impedance spectroscopy on gold electrode for biosensor application. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2008. [DOI: 10.1016/j.msec.2007.10.065] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Soto CM, Martin BD, Sapsford KE, Blum AS, Ratna BR. Toward single molecule detection of staphylococcal enterotoxin B: mobile sandwich immunoassay on gliding microtubules. Anal Chem 2008; 80:5433-40. [PMID: 18543949 DOI: 10.1021/ac800541x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An immunoassay based on gliding microtubules (MTs) is described for the detection of staphylococcal enterotoxin B. Detection is performed in a sandwich immunoassay format. Gliding microtubules carry the antigen-specific "capture" antibody, and bound analyte is detected using a fluorescent viral scaffold as the tracer. A detailed modification scheme for the MTs postpolymerization is described along with corresponding quantification by fluorescence spectroscopy. The resultant antibody-MTs maintain their morphology and gliding capabilities. We report a limit of detection down to 0.5 ng/mL during active transport in a 30 min assay time and down to 1 ng/mL on static surfaces. This study demonstrates the kinesin/MT-mediated capture, transport, and detection of the biowarfare agent SEB in a microfluidic format.
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Affiliation(s)
- Carissa M Soto
- Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375, USA.
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25
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Detection of Staphylococcus enterotoxin B using fluorescent immunoliposomes as label for immunochromatographic testing. Anal Biochem 2008; 377:182-8. [DOI: 10.1016/j.ab.2008.02.032] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2007] [Revised: 02/27/2008] [Accepted: 02/28/2008] [Indexed: 11/21/2022]
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26
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Gehring AG, Albin DM, Reed SA, Tu SI, Brewster JD. An antibody microarray, in multiwell plate format, for multiplex screening of foodborne pathogenic bacteria and biomolecules. Anal Bioanal Chem 2008; 391:497-506. [PMID: 18389224 DOI: 10.1007/s00216-008-2044-6] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2008] [Revised: 02/29/2008] [Accepted: 02/29/2008] [Indexed: 11/30/2022]
Abstract
Intoxication and infection caused by foodborne pathogens are important problems worldwide, and screening tests for multiple pathogens are needed because foods may be contaminated with multiple pathogens and/or toxic metabolites. We developed a 96-well microplate, multiplex antibody microarray method to simultaneously capture and detect Escherichia coli O157:H7 and Salmonella enterica serovar Typhimurium (S. typhimurium), as well as a biomolecule (chicken immunoglobulin G or IgG employed as a proteinaceous toxin analog) in a single sample. Microarrayed spots of capture antibodies against the targeted analytes were printed within individual wells of streptavidin-coated polystyrene 96-multiwell microtiter plates and a sandwich assay with fluorescein- or Cy3-labeled reporter antibodies was used for detection. (Printing was achieved with a conventional microarray printing robot that was operated with custom-developed microplate arraying software.) Detection of the IgG was realized from ca. 5 to 25 ng/mL, and detection of E. coli O157:H7 and S. typhimurium was realized from ca. 10(6) to 10(9) and ca. 10(7) to 10(9) cells/mL, respectively. Multiplex detection of the two bacteria and the IgG in buffer and in culture-enriched ground beef filtrate was established with a total assay (including detection) time of ca. 2.5 h. Detection of S. typhimurium was largely unaffected by high concentrations of the other bacteria and IgG as well as the ground beef filtrate, whereas a small decrease in response was observed for E. coli O157:H7. The multiwell plate, multiplex antibody microarray platform developed here demonstrates a powerful approach for high-throughput screening of large numbers of food samples for multiple pathogens and toxins.
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Affiliation(s)
- Andrew G Gehring
- Microbial Biophysics and Residue Chemistry Research Unit, United States Department of Agriculture-Agricultural Research Service, Eastern Regional Research Center, 600 East Mermaid Lane, Wyndmoor, PA 19038, USA.
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27
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Shriver‐Lake LC, Erickson JS, Sapsford KE, Ngundi MM, Shaffer KM, Kulagina NV, Hu JE, Gray SA, Golden JP, Ligler FS, Taitt CR. Blind Laboratory Trials for Multiple Pathogens in Spiked Food Matrices. ANAL LETT 2007. [DOI: 10.1080/00032710701672798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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28
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Ligler FS, Sapsford KE, Golden JP, Shriver-Lake LC, Taitt CR, Dyer MA, Barone S, Myatt CJ. The array biosensor: portable, automated systems. ANAL SCI 2007; 23:5-10. [PMID: 17213615 DOI: 10.2116/analsci.23.5] [Citation(s) in RCA: 111] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
With recent advances in surface chemistry, microfluidics, and data analysis, there are ever increasing reports of array-based methods for detecting and quantifying multiple targets. However, only a few systems have been described that require minimal preparation of complex samples and possess a means of quantitatively assessing matrix effects. The NRL Array Biosensor has been developed with the goal of rapid and sensitive detection of multiple targets from multiple samples analyzed simultaneously. A key characteristic of this system is its two-dimensional configuration, which allows controls and standards to be analyzed in parallel with unknowns. Although the majority of our work has focused on instrument automation and immunoassay development, we have recently initiated efforts to utilize alternative recognition molecules, such as peptides and sugars, for detection of a wider variety of targets. The array biosensor has demonstrated utility for a variety of applications, including food safety, disease diagnosis, monitoring immune response, and homeland security, and is presently being transitioned to the commercial sector for manufacturing.
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Affiliation(s)
- Frances S Ligler
- Center for Bio/Molecular Science & Engineering, Washington, DC 20375, USA.
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29
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Rapid detection of Escherichia coli O157:H7 spiked into food matrices. Anal Chim Acta 2007; 584:66-71. [DOI: 10.1016/j.aca.2006.11.021] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2006] [Revised: 10/26/2006] [Accepted: 11/07/2006] [Indexed: 11/18/2022]
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30
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Normanno G, La Salandra G, Dambrosio A, Quaglia NC, Corrente M, Parisi A, Santagada G, Firinu A, Crisetti E, Celano GV. Occurrence, characterization and antimicrobial resistance of enterotoxigenic Staphylococcus aureus isolated from meat and dairy products. Int J Food Microbiol 2007; 115:290-6. [PMID: 17321621 DOI: 10.1016/j.ijfoodmicro.2006.10.049] [Citation(s) in RCA: 162] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2006] [Accepted: 10/30/2006] [Indexed: 11/16/2022]
Abstract
Staphylococcus aureus is considered to be one of the leading causes of food-borne illnesses. Milk, dairy products and meats are often contaminated with enterotoxigenic strains of this bacterium. Foodstuff contamination may occur directly from infected food-producing animals or may result from poor hygiene during production processes, or the retail and storage of foods, since humans may carry the microorganism. The number of S. aureus strains that exhibits antimicrobial-resistance properties has increased, together with the potential risk of transmitting the same properties to the human microflora via foods or inducing infections hard to be treated. This paper reports the results of a 3-year survey (2003-2005) on the occurrence of S. aureus in meat and dairy products. Of 1634 samples examined, 209 (12.8%) were contaminated with S. aureus. A total of 125 enterotoxigenic S. aureus strains were biotyped and their antimicrobial resistance pattern tested. Most of the isolated strains produced SED (33.6%), followed by SEA (18.4%), SEC (15.2%), SEB (6.4%) and belonged mainly to the Human ecovar (50.4%), followed by Ovine (23.2%), Non-Host-Specific (17.6%), Bovine (7.2%) and Poultry-like (1.6%) ecovars. Finally, the 68.8% analysed strains showed antimicrobial resistance properties at least at one of antibiotics tested. Human biotype showed antimicrobial resistance at more than one antibiotic than the other biotypes (p<0.05). The results provided evidence that the presence of enterotoxigenic and antimicrobial resistant strains of S. aureus has become remarkably widespread in foods. This calls for better control of sources of food contamination and of the spread of antimicrobial-resistance organisms.
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Affiliation(s)
- G Normanno
- Department of Health and Animal Welfare, Faculty of Veterinary Medicine, 70010 Valenzano (Bari) Italy.
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31
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SPR Biosensors for Detection of Biological and Chemical Analytes. ACTA ACUST UNITED AC 2006. [DOI: 10.1007/5346_019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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32
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Sapsford KE, Taitt CR, Fertig S, Moore MH, Lassman ME, Maragos CM, Shriver-Lake LC. Indirect competitive immunoassay for detection of aflatoxin B1 in corn and nut products using the array biosensor. Biosens Bioelectron 2006; 21:2298-305. [PMID: 16495044 DOI: 10.1016/j.bios.2005.10.021] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2005] [Revised: 10/24/2005] [Accepted: 10/31/2005] [Indexed: 10/25/2022]
Abstract
Because of the potential health risks of aflatoxin B1 (AFB1), it is essential to monitor the level of this mycotoxin in a variety of foods. An indirect competitive immunoassay has been developed using the NRL array biosensor, offering rapid, sensitive detection and quantification of AFB1 in buffer, corn and nut products. AFB1-spiked foods were extracted with methanol and Cy5-anti-AFB1 added to the resulting sample. The extracted sample/antibody mix was passed over a waveguide surface patterned with immobilized AFB1. The resulting fluorescence signal decreased as the concentration of AFB1 in the sample increased. The limit of detection for AFB1 in buffer, 0.3 ng/ml, was found to increase to between 1.5 and 5.1 ng/g and 0.6 and 1.4 ng/g when measured in various corn and nut products, respectively.
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Affiliation(s)
- Kim E Sapsford
- George Mason University, 10910 University Blvd, MS 4E3, Manassas, VA 20110, USA
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33
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Sapsford KE, Taitt CR, Loo N, Ligler FS. Biosensor detection of botulinum toxoid A and staphylococcal enterotoxin B in food. Appl Environ Microbiol 2005; 71:5590-2. [PMID: 16151154 PMCID: PMC1214668 DOI: 10.1128/aem.71.9.5590-5592.2005] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Immunoassays were developed for the simultaneous detection of staphylococcal enterotoxin B and botulinum toxoid A in buffer, with limits of detection of 0.1 ng/ml and 20 ng/ml, respectively. The toxins were also spiked and measured in a variety of food samples, including canned tomatoes, sweet corn, green beans, mushrooms, and tuna.
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Affiliation(s)
- Kim E Sapsford
- George Mason University, 10910 University Boulevard, MS 4E3, Manassas, VA 20110, USA
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34
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Golden J, Shriver-Lake L, Sapsford K, Ligler F. A “do-it-yourself” array biosensor. Methods 2005; 37:65-72. [PMID: 16202623 DOI: 10.1016/j.ymeth.2005.05.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2005] [Accepted: 05/01/2005] [Indexed: 11/18/2022] Open
Abstract
We have developed an array biosensor for the simultaneous detection of multiple targets in multiple samples within 15-30 min. The biosensor is based on a planar waveguide, a modified microscope slide, with a pattern of small (mm2) sensing regions. The waveguide is illuminated by launching the emission of a 635 nm diode laser into the proximal end of the slide via a line generator. The evanescent field excites fluorophores bound in the sensing region and the emitted fluorescence is measured using a Peltier-cooled CCD camera. Assays can be performed on the waveguide in multichannel flow chambers and then interrogated using the detection system described here. This biosensor can detect many different targets, including proteins, toxins, cells, virus, and explosives with detection limits rivaling those of the ELISA detection system.
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Affiliation(s)
- Joel Golden
- Naval Research Laboratory, Code 6900, SW, Washington, DC 20375-5348, USA.
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35
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Taitt CR, Anderson GP, Ligler FS. Evanescent wave fluorescence biosensors. Biosens Bioelectron 2005; 20:2470-87. [PMID: 15854820 DOI: 10.1016/j.bios.2004.10.026] [Citation(s) in RCA: 131] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2004] [Revised: 10/24/2004] [Accepted: 10/28/2004] [Indexed: 10/26/2022]
Abstract
Since discovery and first use in the mid-1970s, evanescent wave fluorescence biosensors have developed into a diverse range of instruments, each designed to meet a particular detection need. In this review, we provide a brief synopsis of what evanescent wave fluorescence biosensors are, how they work, and how they are used. In addition, we have summarized the important patents that have impacted the evolution from laboratory curiosities to fully automated commercial products. Finally, we address the critical issues that evanescent wave fluorescence biosensors will face in the coming years.
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Affiliation(s)
- Chris Rowe Taitt
- Center for Bio/Molecular Science and Engineering, US Naval Research Laboratory, Washington, DC 20375-5348, USA
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36
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Ruan C, Zeng K, Varghese OK, Grimes CA. A staphylococcal enterotoxin B magnetoelastic immunosensor. Biosens Bioelectron 2005; 20:585-91. [PMID: 15494243 DOI: 10.1016/j.bios.2004.03.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2004] [Revised: 02/27/2004] [Accepted: 03/04/2004] [Indexed: 11/23/2022]
Abstract
A magnetoelastic immunosensor for detection of staphylococcal enterotoxin B (SEB) is described. The magnetoelastic sensor is a newly developed mass/elasticity-based transducer of high sensitivity having a material cost of approximately $0.001/sensor. Affinity-purified rabbit anti-SEB antibody was covalently immobilized on magnetoelastic sensors, of dimensions 6 mm x 2 mm x 28 microm. The affinity reaction of biotin-avidin and biocatalytic precipitation are used to amplify antigen-antibody binding events on the sensor surface. Horseradish peroxidase (HRP) and alkaline phosphatase were examined as the labeled enzymes to induce biocatalytic precipitation. The alkaline phosphatase substrate, 5-bromo-4-chloro-3-indolyl phosphate (BCIP) produces a dimer, which binds tightly to the sensor surface, inducing a change in sensor resonance frequency. The biosensor demonstrates a linear shift in resonance frequency with staphylococcal enterotoxin B concentration between 0.5 and 5 ng/ml, with a detection limit of 0.5 ng/ml.
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Affiliation(s)
- Chuanmin Ruan
- Department of Electrical Engineering, 217 Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
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37
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Sapsford KE, Shubin YS, Delehanty JB, Golden JP, Taitt CR, Shriver-Lake LC, Ligler FS. Fluorescence-based array biosensors for detection of biohazards. J Appl Microbiol 2004; 96:47-58. [PMID: 14678158 DOI: 10.1046/j.1365-2672.2003.02115.x] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- K E Sapsford
- Center for Bioresource Development, George Mason University, Fairfax, VA, USA
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38
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Taitt CR, Shubin YS, Angel R, Ligler FS. Detection of Salmonella enterica serovar typhimurium by using a rapid, array-based immunosensor. Appl Environ Microbiol 2004; 70:152-8. [PMID: 14711637 PMCID: PMC321280 DOI: 10.1128/aem.70.1.152-158.2004] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2003] [Accepted: 10/16/2003] [Indexed: 11/20/2022] Open
Abstract
The multianalyte array biosensor (MAAB) is a rapid analysis instrument capable of detecting multiple analytes simultaneously. Rapid (15-min), single-analyte sandwich immunoassays were developed for the detection of Salmonella enterica serovar Typhimurium, with a detection limit of 8 x 10(4) CFU/ml; the limit of detection was improved 10-fold by lengthening the assay protocol to 1 h. S. enterica serovar Typhimurium was also detected in the following spiked foodstuffs, with minimal sample preparation: sausage, cantaloupe, whole liquid egg, alfalfa sprouts, and chicken carcass rinse. Cross-reactivity tests were performed with Escherichia coli and Campylobacter jejuni. To determine whether the MAAB has potential as a screening tool for the diagnosis of asymptomatic Salmonella infection of poultry, chicken excretal samples from a private, noncommercial farm and from university poultry facilities were tested. While the private farm excreta gave rise to signals significantly above the buffer blanks, none of the university samples tested positive for S. enterica serovar Typhimurium without spiking; dose-response curves of spiked excretal samples from university-raised poultry gave limits of detection of 8 x 10(3) CFU/g.
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Affiliation(s)
- Chris Rowe Taitt
- Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, D.C. 20375, USA.
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