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Çam Derin D, Gültekin E, Gündüz E, Otlu B. Comparison of Six Aptamer-Aptamer Pairs on Rapid Detection of SARS-CoV-2 by Lateral Flow Assay. J AOAC Int 2024; 107:464-470. [PMID: 38218729 DOI: 10.1093/jaoacint/qsae004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 01/01/2024] [Accepted: 01/03/2024] [Indexed: 01/15/2024]
Abstract
BACKGROUND SARS-CoV-2 is a threat to humanity. Both the spike (S) protein and its receptor binding domain (sRBD) are extensively used for rapid detection. Although real-time reverse transcription polymerase chain reaction (rRT-PCR) is mostly used method for the molecular detection of SARS-CoV-2, rapid assays for antigenic detection are always needed. Lateral flow assays (LFAs) are the most commonly used tests for this purpose, and aptamers having stability and long shelf life are used as capture reagents. OBJECTIVE This study aimed to develop the LFAs based on the aptamer pairs for the antigenic detection of SARS-CoV-2 with the naked eye. METHOD Gold nanoparticles (AuNPs) were used as labels, and six sandwich models by three different aptamers were prepared using 4 μM and 8 μM probes and two kinds of membranes for developing the LFAs. RESULTS The 8 μM probe concentration and M2 membrane showed the best recognition of both the synthetic sRBD and SARS-CoV-2 coming from the naso/oropharingeal swabs by designed LFAs as 100% sensitivity and 93.3% specificity compared to the antibody-detecting LFAs. CONCLUSIONS Our developed strip assays based on aptamer pairs recognized the target directly in 5-6 min with the naked eye. It was also concluded that aptamer pairs, membrane types, assay buffers, and probe concentrations have a significant role in the detection of SARS-CoV-2 by LFAs. HIGHLIGHTS The detection of SARS-CoV-2 in clinical samples was demonstrated with the best aptamer pairs, sensitively and selectively among the designed six aptamer pairs for LFAs. Developed LFAs can be an alternative method to the conventional antibody-based LFAs for SARS-CoV-2 detection.
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Affiliation(s)
- Dilek Çam Derin
- Inonu University, Department of Molecular Biology and Genetics, 44280 Malatya, Turkey
| | - Enes Gültekin
- Inonu University, Department of Molecular Biology and Genetics, 44280 Malatya, Turkey
| | - Elif Gündüz
- Inonu University, Department of Molecular Biology and Genetics, 44280 Malatya, Turkey
| | - Barış Otlu
- Inonu University, Department of Medical Microbiology, 44280 Malatya, Turkey
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2
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Amini M, Pourmand MR, Faridi-Majidi R. Development of a High Sensitive Multiplex Lateral Flow Immunoassay (LFIA) System for Rapid Detection of Methicillin-Resistant Staphylococcus Aureus (MRSA). Avicenna J Med Biotechnol 2023; 15:100-107. [PMID: 37034894 PMCID: PMC10073916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 02/10/2023] [Indexed: 04/11/2023] Open
Abstract
Background Methicillin-resistant Staphylococcus aureus (MRSA) has become a worldwide concern as an epidemic bacterium and a cause of nosocomial and community-acquired infections. One of the major problems in the prevention and treatment of infections caused by MRSA strains is their multi-drug resistant trait, which causes the spread of infections and increases the mortality rate. Therefore, a rapid and accurate method is needed to identify MRSA strains, initiate appropriate antibiotic therapy, and control its infection. The aim of this study was to develop a twin lateral flow immunoassay system to detect methicillin-resistant Staphylococcus aureus (MRSA). Methods First, BSA blocked AuNPs-anti-peptidoglycan antibody and AuNPs-anti-BSA antibody were used to detect Staphylococcus aureus (S. aureus). Then, AuNPs-anti-PBP2a antibody was used to specifically detect MRSA. Sensitivity, specificity and limit of detection of this twin immunoassay system were assessed using MRSA, methicillin susceptible S. aureus and clinical samples. Results were compared to those of cefoxitin disc diffusion (FOX30) and Polymerase Chain Reaction (PCR) as gold standards. Results The Limit of Detection (LOD) of this twin system were 103 and 104 CFU/ml for the first and second strips, respectively. Sensitivity and specificity of this innovative assay in detecting MRSA were 92.30 and 97.36%, compared to FOX30 and PCR, respectively. Conclusion High rates of sensitivity and specificity of this initiative system show its high potentials for rapid and accurate detection of MRSA.
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Affiliation(s)
- Masoomeh Amini
- Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Reza Pourmand
- Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Reza Faridi-Majidi
- Department of Medical Nanotechnology, School of Advanced Technologies in Medicine, University of Medical Sciences (TUMS), Tehran, Iran
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3
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Simultaneous detection of mixed foodborne pathogens by multi-molecular infrared spectroscopy identification system. Food Control 2022. [DOI: 10.1016/j.foodcont.2022.108861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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4
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Kaur M, Eltzov E. Optimizing Effective Parameters to Enhance the Sensitivity of Vertical Flow Assay for Detection of Escherichia coli. BIOSENSORS 2022; 12:bios12020063. [PMID: 35200324 PMCID: PMC8869093 DOI: 10.3390/bios12020063] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/17/2022] [Accepted: 01/19/2022] [Indexed: 06/01/2023]
Abstract
Vertical flow immunoassays (VFIAs) are considered potential point-of-care testing (POCT) devices compared to lateral flow assays due to their ability to analyze a comparatively large sample volume and ease of multiplexing. However, VFIA devices are limited by low analytical sensitivity when coupled with a visual colorimetric signal. Herein, we carefully analyzed key parameters that accounted for the proper functionality of VFIA that can be modified to enhance the overall sensitivity of VFIA. In particular, we focused on improving the stability of conjugate pads impregnated with capture antibodies, maintaining a controlled flow rate to ensure higher analyte reactivity with capture antibodies, and enhancing the absorption efficiency. The results showed that air-drying of conjugate pads in the presence of 5% (w/v) lactose significantly improved the stability of antibodies during long-term storage. Integration of dissolvable polyvinyl alcohol (PVA) membrane of optimal concentration as a time-barrier film into the sensor delayed the flow of samples, thereby increasing the biorecognition interaction time between immunoreagents for the formation of immuno-complexes, which in turn led to higher sensitivity of the assay. Furthermore, the employment of an absorbent pad with higher water holding capacity significantly reduced the non-specific binding of immunocomplexes, thereby reducing the possibility of false-negative results.
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Affiliation(s)
- Manpreet Kaur
- Department of Postharvest Science, Institute of Postharvest and Food Sciences, The Volcani Institute, Agricultural Research Organization, Bet Dagan 50250, Israel;
- Institute of Biochemistry, Food Science and Nutrition, Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
| | - Evgeni Eltzov
- Department of Postharvest Science, Institute of Postharvest and Food Sciences, The Volcani Institute, Agricultural Research Organization, Bet Dagan 50250, Israel;
- Agro-Nanotechnology and Advanced Materials Research Center, Institute of Postharvest and Food Science, Department of Postharvest Science, Agricultural Research Organization, The Volcani Institute, Rishon LeZion 7505101, Israel
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Bao H, Yuan M, Xiao C, Liu D, Lai W. Development of a signal-enhanced LFIA based on tyramine-induced AuNPs aggregation for sensitive detection of danofloxacin. Food Chem 2021; 375:131875. [PMID: 34959139 DOI: 10.1016/j.foodchem.2021.131875] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 12/02/2021] [Accepted: 12/14/2021] [Indexed: 12/16/2022]
Abstract
A signal-enhanced LFIA based on tyramine (TYR)-induced AuNPs aggregation has been developed for the sensitive detection of danofloxacin (DAN). In the model, the hydroxyl radical produced by HRP catalyzing H2O2 can trigger the TYR-AuNPs to aggregate on the T or C line for enhancing the detection signal. The linear range of TYR-AuNPs LFIA was 0.25-5 ng mL-1 with the limit of detection (LOD) of 0.032 ng mL-1, and the LOD was 8-fold lower than that of the traditional AuNPs LFIA (0.26 ng mL-1). The TYR-AuNPs LFIA could be used with the naked eyes to qualitatively detect DAN with a cut-off limit of 2.5 ng mL-1, which was 4-fold lower than that of the traditional AuNPs LFIA (10 ng mL-1). The recoveries of TYR-AuNPs LFIA were 86.04-105.14% and 92.41-110.19%, with the coefficient of variation of 1.71-2.05% and 4.42-5.89% in chicken and pork, respectively.
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Affiliation(s)
- Huanhuan Bao
- State Key Laboratory of Food Science and Technology, Nanchang University 235, East Nanjing Road, Nanchang 330047, China
| | - Meifang Yuan
- Jiangxi Institute for Food Control, Nanchang 330001, China
| | - Chengui Xiao
- Food Inspection and Quarantine Technology Center of Shenzhen Customs, Shenzhen Academy of Inspection and Quarantine, Shenzhen, Guangdong 518045, China
| | - Daofeng Liu
- Jiangxi Province Centre for Disease Control and Prevention, 555, East Beijing Road, Nanchang 330029, China
| | - Weihua Lai
- State Key Laboratory of Food Science and Technology, Nanchang University 235, East Nanjing Road, Nanchang 330047, China.
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Rapid Detection of Escherichia coli O157:H7 by Loop-Mediated Isothermal Amplification Coupled with a Lateral Flow Assay Targeting the z3276 Genetic Marker. FOOD ANAL METHOD 2021. [DOI: 10.1007/s12161-021-02172-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Gupta Y, Ghrera AS. Recent advances in gold nanoparticle-based lateral flow immunoassay for the detection of bacterial infection. Arch Microbiol 2021; 203:3767-3784. [PMID: 34086107 DOI: 10.1007/s00203-021-02357-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 04/24/2021] [Accepted: 05/03/2021] [Indexed: 12/17/2022]
Abstract
Diagnosis of bacterial infections (BI) is becoming an increasingly difficult task in clinical practice due to their high prevalence and frequency, as well as the growth of antibiotic resistance worldwide. World Health Organization (WHO) reported antibiotic resistance is a major public health problem. BI becomes difficult or impossible to treat when the bacteria acquire immunity against antibiotics. Thus, there is a need for a quick and accurate technique to detect infection. Lateral flow immunoassay (LFIA) is an ideal technique for point-of-care testing of a disease or pathological changes inside the human body. In recent years, several LFIA based strips are being used for the detection of BI by targeting specific analytes which may range from the causative bacterium, whole-cell, DNA, or biomarker. Numerous nanoparticles like lipid-based nanoparticles, polymeric nanoparticles, and inorganic nanoparticles such as quantum dots, magnetic, ceramic, and metallic nanoparticles (copper, silver gold, iron) are widely being used in the advanced treatment of BI. Out of these gold nanoparticle (AuNPs), is being used for detection BI more effectively than other nanoparticles due to their surface functionalization, extraordinary chemical stability, biorecognition, and signal amplification properties and help to improve in conjugation with capture antibodies, and act as a color marker with unique optical properties on LFIA strips. Herein, a review that provides an overview of the principle of LFIA, how LFIA based strip is developed, and how it is helpful to detect a specific biomarker for bedside detection of the BI.
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Affiliation(s)
- Yachana Gupta
- Applied Science Department, The NorthCap University, Gurugram, India
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Lin WZ, Ma IC, Wang JP, Hsieh PC, Liu CC, Hou SY. Highly sensitive protein detection using recombinant spores and lateral flow immunoassay. Anal Bioanal Chem 2021; 413:2235-2246. [PMID: 33608751 DOI: 10.1007/s00216-021-03195-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 01/20/2021] [Accepted: 01/23/2021] [Indexed: 11/28/2022]
Abstract
Lateral flow immunoassays (LFIs) can be used to detect intact bacteria or spores; when gold nanoparticles (AuNPs) are used as the signal reporters, the detection limits are very low. Spore-based surface display has been widely studied for enzyme immobilization and live-nontoxic oral vaccines. In this study, recombinant spores were used to improve the sensitivity of a LFI. We developed a test kit that combines streptavidin-displayed spores with a LFI assay for rapid protein detection. The recombinant spores served as a signal amplifier and AuNPs were used as the signal reporters. For detection of β-galactosidase, which was used as the model protein, the detection limit was about 10-15 mol, while that of the conventional LFI is about 10-12 mol. In both methods, nanogold was used as the colorimetric signal and could be observed with the naked eye. This method improved LFI sensitivity without sacrificing its advantages. Furthermore, enhanced green fluorescent protein (eGFP) was also displayed on the surface of the streptavidin-displayed spores. Without AuNPs, the fluorescent recombinant spores acted as the signal, which could be detected by a fluorescence detector, such as a fluorescence microscope. The detection limit was 10-16 mol under fluorescence microscopy whose magnification was 25-fold. Therefore, in conclusion, in this proof of concept study, the detection limits of both proposed methods were far superior to those of traditional LFI assay.
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Affiliation(s)
- Wen-Zhi Lin
- Institute of Preventive Medicine, National Defense Medical Center, Taipei, 11490, Taiwan.,Department of Biology and Anatomy, National Defense Medical Center, Taipei, 11490, Taiwan
| | - I-Cheng Ma
- Graduate Institute of Chemical Engineering, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, 10608, Taiwan
| | - Jun-Pei Wang
- Graduate Institute of Chemical Engineering, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, 10608, Taiwan
| | - Ping-Chun Hsieh
- Graduate Institute of Biochemical and Biomedical Engineering, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, 10608, Taiwan
| | - Cheng-Che Liu
- Graduate Institute of Physiology, National Defense Medical Center, Taipei, 11490, Taiwan
| | - Shao-Yi Hou
- Graduate Institute of Biochemical and Biomedical Engineering, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, 10608, Taiwan.
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Wu S, Du J, Xiang Q, Zhao D, Bai Y. Solvothermal synthesis of α-Fe 2O 3 polyhedrons and its application in an immunochromatographic strip test for the detection of foodborne pathogen Listeria monocytogenes. NANOTECHNOLOGY 2021; 32:085502. [PMID: 33202394 DOI: 10.1088/1361-6528/abcb30] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The immunochromatographic strip test (ICST) is a powerful on-site detection technology due to its unique advantages of simplicity, rapidity, and readability by the naked eye. Here we illustrate the potential of α-Fe2O3 polyhedrons as a novel visual label, which exhibit advantages of high stability and economy, for the detection of Listeria monocytogenes (L. monocytogenes) as a model foodborne pathogen. A low-cost and simple one-step solvothermal approach was developed for the synthesis of α-Fe2O3 polyhedrons; the average diameter of the α-Fe2O3 polyhedrons is about 200 nm. The crystal structure and morphology of α-Fe2O3 polyhedrons were characterized by x-ray diffraction and transmission electron microscope. α-Fe2O3 polyhedrons were immunized with anti-L. monocytogenes antibody to prepare an antibody-colloidal α-Fe2O3 polyhedron ICST. Visual detection can be obtained directly by the naked eye within 10 min. The detection limit of L. monocytogenes by α-Fe2O3 polyhedron ICST assay was 3.8 × 106 and 5.6 × 106 CFU/ml of pure culture and artificially spiked orange juice drink sample, respectively. Results indicated that the antibody-colloidal α-Fe2O3 polyhedron ICST is a rapid, simple, and low-cost assay. This approach showed great potential in the application of foodborne pathogen detection concerning food safety.
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Affiliation(s)
- Shujing Wu
- College of Food and Biological Engineering, Henan Key Laboratory of Cold Chain Food Quality and Safety Control, Henan collaborative Innovation Center of Food Production and Safety, Zhengzhou University of Light Industry, Zhengzhou, 450001, People's Republic of China
| | - Juan Du
- College of Food and Biological Engineering, Henan Key Laboratory of Cold Chain Food Quality and Safety Control, Henan collaborative Innovation Center of Food Production and Safety, Zhengzhou University of Light Industry, Zhengzhou, 450001, People's Republic of China
| | - Qisen Xiang
- College of Food and Biological Engineering, Henan Key Laboratory of Cold Chain Food Quality and Safety Control, Henan collaborative Innovation Center of Food Production and Safety, Zhengzhou University of Light Industry, Zhengzhou, 450001, People's Republic of China
| | - Dianbo Zhao
- College of Food and Biological Engineering, Henan Key Laboratory of Cold Chain Food Quality and Safety Control, Henan collaborative Innovation Center of Food Production and Safety, Zhengzhou University of Light Industry, Zhengzhou, 450001, People's Republic of China
| | - Yanhong Bai
- College of Food and Biological Engineering, Henan Key Laboratory of Cold Chain Food Quality and Safety Control, Henan collaborative Innovation Center of Food Production and Safety, Zhengzhou University of Light Industry, Zhengzhou, 450001, People's Republic of China
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10
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Sun Y, Kuo C, Lu C, Lin C. Review of recent advances in improved lateral flow immunoassay for the detection of pathogenic
Escherichia
coli
O157
:
H7
in foods. J Food Saf 2020. [DOI: 10.1111/jfs.12867] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Yu‐Ling Sun
- Aquatic Technology Laboratories Agricultural Technology Research Institute Hsinchu Taiwan
| | - Chiu‐Mei Kuo
- Bioresource Collection and Research Center Food Industry Research and Development Institute Hsinchu Taiwan
| | - Chung‐Lun Lu
- Aquatic Technology Laboratories Agricultural Technology Research Institute Hsinchu Taiwan
| | - Chih‐Sheng Lin
- Department of Biological Science and Technology National Chiao Tung University Hsinchu Taiwan
- Center for Intelligent Drug Systems and Smart Bio‐devices (IDS2B) National Chiao Tung University Hsinchu Taiwan
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Amini M, Pourmand MR, Faridi-Majidi R, Heiat M, Mohammad Nezhady MA, Safari M, Noorbakhsh F, Baharifar H. Optimising effective parameters to improve performance quality in lateral flow immunoassay for detection of PBP2a in methicillin-resistant Staphylococcus aureus (MRSA). JOURNAL OF EXPERIMENTAL NANOSCIENCE 2020; 15:266-279. [DOI: 10.1080/17458080.2020.1775197] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 05/18/2020] [Indexed: 07/12/2024]
Affiliation(s)
- M. Amini
- Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - M. R. Pourmand
- Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - R. Faridi-Majidi
- Department of Medical Nanotechnology, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences (TUMS), Tehran, Iran
| | - M. Heiat
- Baqiyatallah Research Center for Gastroenterology and Liver Disease, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | | | - M. Safari
- Department of Medical Nanotechnology, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences (TUMS), Tehran, Iran
| | - F. Noorbakhsh
- Department of Immunology, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - H. Baharifar
- Department of Medical Nanotechnology, Applied biophotonics research center, Science and Research Branch, Islamic Azad University, Tehran, Iran
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Hubbe H, Mendes E, Boukany PE. Polymeric Nanowires for Diagnostic Applications. MICROMACHINES 2019; 10:mi10040225. [PMID: 30934898 PMCID: PMC6523414 DOI: 10.3390/mi10040225] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Revised: 03/07/2019] [Accepted: 03/15/2019] [Indexed: 02/06/2023]
Abstract
Polymer nanowire-related research has shown considerable progress over the last decade. The wide variety of materials and the multitude of well-established chemical modifications have made polymer nanowires interesting as a functional part of a diagnostic biosensing device. This review provides an overview of relevant publications addressing the needs for a nanowire-based sensor for biomolecules. Working our way towards the detection methods itself, we review different nanowire fabrication methods and materials. Especially for an electrical signal read-out, the nanowire should persist in a single-wire configuration with well-defined positioning. Thus, the possibility of the alignment of nanowires is discussed. While some fabrication methods immanently yield an aligned single wire, other methods result in disordered structures and have to be manipulated into the desired configuration.
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Affiliation(s)
- Hendrik Hubbe
- Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629HZ Delft, The Netherlands.
| | - Eduardo Mendes
- Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629HZ Delft, The Netherlands.
| | - Pouyan E Boukany
- Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629HZ Delft, The Netherlands.
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Çam D, Öktem HA. Development of rapid dipstick assay for food pathogens, Salmonella, by optimized parameters. JOURNAL OF FOOD SCIENCE AND TECHNOLOGY 2019; 56:140-148. [PMID: 30728555 PMCID: PMC6342776 DOI: 10.1007/s13197-018-3467-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 07/10/2018] [Accepted: 10/18/2018] [Indexed: 01/09/2023]
Abstract
Salmonella is among the very important pathogens threating the human and animal health. Rapid and easy detection of these pathogens is crucial. In this context, antibody (Ab) based lateral flow assays (LFAs) which are simple immunochromatographic point of care test kits were developed by gold nanoparticles (GNPs) as labelling agent for Salmonella detection. For that purpose some critical parameters such as reagent concentrations on the capture zones, conjugate concentrations and ideal membrane type needed for LFAs for whole cell detection were tested for naked eye analysis. Therefore, prepared LFAs were applied to the live and heat inactivated cells when they were used alone or included in different bacterial mixtures. Among the test platforms, membrane 180 (M180) was found as an ideal membrane and 36 nm GNPs showed highly good labelling in the developed LFAs. Diluted conjugates and low concentrations of reagents affected the test signal negatively. Salmonella was detected in different bacterial mixtures, selectively in 4-5 min. The best recognized species by used Ab were S. enteritidis and S. infantis. 5 × 105 S. typhimurium cells were also determined as a limit of detection of this study with mentioned parameters.
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Affiliation(s)
- Dilek Çam
- Department of Biological Sciences, Middle East Technical University, 06800 Ankara, Turkey
- Department of Biology, Çankırı Karatekin University, 18100 Çankırı, Turkey
| | - Hüseyin Avni Öktem
- Department of Biological Sciences, Middle East Technical University, 06800 Ankara, Turkey
- NANOBIZ TECHNOLOGY INC., Gallium Block No: 27/218, METU Technopolis, 06800 Ankara, Turkey
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