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Zeng Z, Li H, Li Q, Sun R, Zhang X, Zhang D, Zhu Q, Chen C. Quantitative measurement of acute myocardial infarction cardiac biomarkers by "All-in-One" immune microfluidic chip for early diagnosis of myocardial infarction. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 315:124256. [PMID: 38615418 DOI: 10.1016/j.saa.2024.124256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Revised: 02/26/2024] [Accepted: 04/04/2024] [Indexed: 04/16/2024]
Abstract
Acute myocardial infarction (AMI) is a life-threatening condition with a narrow treatment window, necessitating rapid and accurate diagnostic methods. We present an "all-in-one" convenient and rapid immunoassay system that combines microfluidic technology with a colloidal gold immunoassay. A degassing-driven chip replaces a bulky external pump, resulting in a user-friendly and easy-to-operate immunoassay system. The chip comprises four units: an inlet reservoir, an immunoreaction channel, a waste pool, and an immunocomplex collection chamber, allowing single-channel flow for rapid and accurate AMI biomarker detection. In this study, we focused on cardiac troponin I (cTnI). With a minimal sample of just 4 μL and a total detection time of under 3 min, the chip enabled a quantitative visual analysis of cTnI concentration within a range of 0.5 ∼ 60.0 ng mL-1. This all-in-one integrated microfluidic chip with colloidal gold immunoassay offers a promising solution for rapid AMI diagnosis. The system's portability, small sample requirement, and quantitative visual detection capabilities make it a valuable tool for AMI diagnostics.
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Affiliation(s)
- Zhaokui Zeng
- Xiangya School of Pharmaceutical Sciences, Central South University, Changsha 410013, China
| | - Huimin Li
- Yueyang Inspection and Testing Center, Yueyang 414000, China
| | - Qi Li
- Xiangya School of Pharmaceutical Sciences, Central South University, Changsha 410013, China
| | - Ruowei Sun
- Hunan Zaochen Nanorobot Co., Ltd, Liuyang 410300, China
| | - Xun Zhang
- Hunan Zaochen Nanorobot Co., Ltd, Liuyang 410300, China
| | - Di Zhang
- Department of Laboratory, The Third Xiangya Hospital, Central South University, Changsha 410013, China
| | - Qubo Zhu
- Xiangya School of Pharmaceutical Sciences, Central South University, Changsha 410013, China
| | - Chuanpin Chen
- Xiangya School of Pharmaceutical Sciences, Central South University, Changsha 410013, China.
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2
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Kourentzi K, Brosamer K, Vu B, Willson RC. Accelerated Development of a COVID-19 Lateral Flow Test in an Academic Setting: Lessons Learned. Acc Chem Res 2024; 57:1372-1383. [PMID: 38590049 PMCID: PMC11080997 DOI: 10.1021/acs.accounts.4c00075] [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: 02/01/2024] [Revised: 03/26/2024] [Accepted: 03/29/2024] [Indexed: 04/10/2024]
Abstract
The COVID-19 pandemic further demonstrated the need for usable, reliable, and cost-effective point-of-care diagnostics that can be broadly deployed, ideally for self-testing at home. Antigen tests using more-detectable reporter labels (usually at the cost of reader complexity) achieve better diagnostic sensitivity, supporting the value of higher-analytical-sensitivity reporter technologies in lateral flow.We developed a new approach to simple, inexpensive lateral flow assays (LFAs) of great sensitivity, based on the glow stick peroxyoxalate chemistry widely used in emergency settings and in children's toys. At the peak of the COVID-19 pandemic, we had the opportunity to participate in the pandemic-driven NIH Rapid Acceleration of Diagnostics (RADx) initiative aiming to develop a deployable lateral flow diagnostic for SARS-CoV-2 nucleoprotein based on our novel glow stick-inspired light-emitting reporter technology. During this project, we screened more than 250 antibody pairs for analytical sensitivity and specificity directly in LFA format, using recombinant nucleoprotein and then gamma-irradiated virions spiked into negative nasal swab extracts. Membranes and other LFA materials and swabs and extraction reagent components also were screened and selected. Optimization of conjugate preparation and spraying as well as pretreatment/conditioning of the sample pad led to the final optimized LFA strip. Technology development also included optimization of excitation liquid enclosed in disposable droppers, design of a custom cartridge and smartphone-based reader, and app development, even a prototype reader usable with any mobile phone. Excellent preclinical performance was first demonstrated with contrived samples and then with leftover clinical samples. Moving beyond traditional academic focus areas, we were able to establish a quality management system (QMS), produce large numbers of customized LFA cassettes by contract injection molding, build in-house facilities to assemble and store thousands of complete tests for verification and validation and usability studies, and source kitting/packaging services and quality standard reagents and build partnerships for clinical translation, regulatory guidance, scale up, and market deployment. We were not able to bring this early stage technology to the point of commercialization within the limited time and resources available, but we did achieve strong proof-of-concept and advance translational aspects of the platform including initial high-performance LFAs, reading by the iPhone app using only a $2 plastic dark box with no lens, and convenient, usable excitation liquid packaging in droppers manufacturable in very large numbers.In this Account, we aim to provide a concise overview of our 18-month sprint toward the practical development of a deployable antigen lateral flow assay under pandemic conditions and the challenges and successes experienced by our team. We highlight what it takes to coach a technically savvy but commercially inexperienced academic team through the accelerated translation of an early stage technology into a useful product. Finally, we provide a guided tutorial and workflow to empower others interested in the rapid development of translatable LFAs.
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Affiliation(s)
- Katerina Kourentzi
- William
A. Brookshire Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77004, United States
| | - Kristen Brosamer
- Department
of Biomedical Engineering, University of
Houston, Houston, Texas 77004, United States
| | - Binh Vu
- William
A. Brookshire Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77004, United States
| | - Richard C. Willson
- William
A. Brookshire Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77004, United States
- Department
of Biomedical Engineering, University of
Houston, Houston, Texas 77004, United States
- Department
of Biology and Biochemistry, University
of Houston, Houston, Texas 77004, United States
- Escuela
de Medicina y Ciencias de Salud, Tecnológico
de Monterrey, 64849 Monterrey, Nuevo León, México
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Bikkarolla SK, Venkatesan K, Revathy YR, Parameswaran S, Krishnakumar S, Dendukuri D. The Quantitative Detection of Cystatin-C in Patient Samples Using a Colorimetric Lateral Flow Immunoassay. BIOSENSORS 2024; 14:30. [PMID: 38248407 PMCID: PMC10813198 DOI: 10.3390/bios14010030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 11/30/2023] [Accepted: 12/05/2023] [Indexed: 01/23/2024]
Abstract
A colloidal gold-based lateral flow immunoassay was developed for the rapid quantitative detection of Cystatin-C in serum and whole blood. This device has an assay time of 15 min, making it a convenient point-of-care diagnostic tool. The device has a quantification range spanning from 0.5 to 7.5 µg/mL, with a lower limit of detection at 0.18 µg/mL. To validate its accuracy, the test was compared to a standard nephelometric immunoassay, and the results exhibited a robust linear correlation with an adjusted r2 value of 0.95. Furthermore, the device demonstrates satisfactory levels of analytical performance in terms of precision, sensitivity, and interference, indicating its potential for precise Cystatin-C quantification, particularly in renal-failure patients. Notably, the Cystatin-C-LFA device also demonstrates satisfactory stability, as a 30-day accelerated stability study at 50 °C showed no change in the device performance, indicating a long shelf life for the product when stored at room temperature.
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Affiliation(s)
| | - Kavipriya Venkatesan
- Achira Labs, 66b, 13th Cross Rd, Dollar Layout, 3rd Phase, J. P. Nagar, Bengaluru 560078, India
| | | | | | | | - Dhananjaya Dendukuri
- Achira Labs, 66b, 13th Cross Rd, Dollar Layout, 3rd Phase, J. P. Nagar, Bengaluru 560078, India
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Sarathkumar E, Anjana RS, Jayasree RS. Nanoarchitectonics of photothermal materials to enhance the sensitivity of lateral flow assays. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2023; 14:988-1003. [PMID: 37822722 PMCID: PMC10562646 DOI: 10.3762/bjnano.14.82] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 09/14/2023] [Indexed: 10/13/2023]
Abstract
Lateral flow assays (LFAs) are currently the most widely used point-of-care testing technique with remarkable advantages such as simple operation, rapid analysis, portability, and low cost. Traditionally, gold nanoparticles are employed as tracer element in LFAs due to their strong localised surface plasmon resonance. However, this conventional LFA technique based on colorimetric analysis is neither useful to determine critical analytes with desired sensitivity, nor can it quantify the analytes. Various signal amplification strategies have been proposed to improve the sensitivity and the quantitative determination of analytes using LFAs. One of the promising strategies is to enhance the photothermal properties of nanomaterials to generate heat after light irradiation, followed by a temperature measurement to detect and quantify the analyte concentration. Recently, it has been observed that the nanoscale architecture of materials, including size, shape, and nanoscale composition, plays a significant role in enhancing the photothermal properties of nanomaterials. In this review, we discuss the nanoarchitectonics of nanomaterials regarding enhanced photothermal properties and their application in LFAs. Initially, we discuss various important photothermal materials and their classification along with their working principle. Then, we highlight important aspects of the nanoscale architecture (i.e., size, shape, and composition) to enable maximum light-to-heat conversion efficiency. Finally, we discuss some of the recent advances in photothermal LFAs and their application in detecting analytes.
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Affiliation(s)
- Elangovan Sarathkumar
- Division of Biophotonics and Imaging, Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Poojappura, Thiruvananthapuram-695012, Kerala, India
| | - Rajasekharan S Anjana
- Division of Biophotonics and Imaging, Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Poojappura, Thiruvananthapuram-695012, Kerala, India
| | - Ramapurath S Jayasree
- Division of Biophotonics and Imaging, Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Poojappura, Thiruvananthapuram-695012, Kerala, India
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Zhang Y, Liao T, Wang G, Xu J, Wang M, Ren F, Zhang H. An ultrasensitive NIR-IIa' fluorescence-based multiplex immunochromatographic strip test platform for antibiotic residues detection in milk samples. J Adv Res 2023; 50:25-34. [PMID: 36280143 PMCID: PMC10403655 DOI: 10.1016/j.jare.2022.10.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Revised: 10/13/2022] [Accepted: 10/15/2022] [Indexed: 11/05/2022] Open
Abstract
INTRODUCTION Widely used in livestock breeding, residues of antibiotic drugs in milk have become a threat to food safety and human health. Current rapid detection technologies using colorimetric immunochromatographic strip tests (IST) lack the necessary sensitivity for on-site trace monitoring. Fluorescence-based detection in the near-infrared IIa' (NIR-IIa') region (1000 ∼ 1300 nm) has enormous potential due to greatly minimized auto-fluorescence and light scattering. OBJECTIVES The aim of this work is to develop an ultrasensitive IST platform using NIR-IIa' fluorescent nanoparticles as labels for multiplex antibiotic residues detection in milk. METHODS NIR-IIa' fluorescent nanoparticles were assembled by encapsulating synthesized NIR-IIa' fluorophores into carboxyl - modified polystyrene nanoparticles. The NIR-IIa' nanoparticles were subsequently used as labels in an IST platform to detect sulfonamides, quinolones, and lincomycin simultaneously in milk. A portable fluorescent reader was fabricated to provide on-site detection. To further validate the developed IST platform, the detection was compared with LC-MS/MS in 22 real milk samples. RESULTS Fluorescent nanoparticles were synthesized with low energy emission (1030 nm) and large Stokes shift (>250 nm) showing a much higher signal-to-noise ratio compared with fluorophores emitting in the NIR-I region. The developed IST platform yielded a highly sensitive, simultaneous quantification of sulfonamides, quinolones, and lincomycin in milk with detection limits of 46.7, 27.6 and 51.4 pg/mL, respectively, achieving a wide detection range (up to 50 ng/mL). The IST platform showed good accuracy, reproducibility, and specificity with the portable fluorescent reader which could rapidly quantify in 10 s. These results were better than reported immunochromatographic assays using fluorescent labels, and remarkably, showed a higher recognition ability than LC-MS/MS for real samples. CONCLUSION The utility of NIR-IIa' fluorescence-based IST platform for the fast, sensitive, and accurate detection of antibiotics in milk was demonstrated, successfully verifying the potential of this platform in detecting trace materials in complex matrices.
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Affiliation(s)
- Yunyue Zhang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, PR China; Beijing Laboratory of Food Quality and Safety, Department of Nutrition and Health, China Agricultural University, Beijing 100091, PR China
| | - Tao Liao
- WWHS Biotech. Inc. Research Institute of Tsinghua University in Shenzhen, Shenzhen, Guangdong 518100, PR China
| | - Guoxin Wang
- WWHS Biotech. Inc. Research Institute of Tsinghua University in Shenzhen, Shenzhen, Guangdong 518100, PR China
| | - Juan Xu
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, PR China; Beijing Laboratory of Food Quality and Safety, Department of Nutrition and Health, China Agricultural University, Beijing 100091, PR China
| | - Mohan Wang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, PR China; Beijing Laboratory of Food Quality and Safety, Department of Nutrition and Health, China Agricultural University, Beijing 100091, PR China
| | - Fazheng Ren
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, PR China; Beijing Laboratory of Food Quality and Safety, Department of Nutrition and Health, China Agricultural University, Beijing 100091, PR China; Food Laboratory of Zhongyuan, Luohe, Henan 462300, PR China
| | - Hao Zhang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, PR China; Beijing Laboratory of Food Quality and Safety, Department of Nutrition and Health, China Agricultural University, Beijing 100091, PR China; Food Laboratory of Zhongyuan, Luohe, Henan 462300, PR China.
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Wang W, Chen K, Ma X, Guo J. Artificial intelligence reinforced upconversion nanoparticle-based lateral flow assay via transfer learning. FUNDAMENTAL RESEARCH 2023; 3:544-556. [PMID: 38933552 PMCID: PMC11197505 DOI: 10.1016/j.fmre.2022.03.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Revised: 03/09/2022] [Accepted: 03/17/2022] [Indexed: 01/03/2023] Open
Abstract
The combination of upconverting nanoparticles (UCNPs) and immunochromatography has become a widely used and promising new detection technique for point-of-care testing (POCT). However, their low luminescence efficiency, non-specific adsorption, and image noise have always limited their progress toward practical applications. Recently, artificial intelligence (AI) has demonstrated powerful representational learning and generalization capabilities in computer vision. We report for the first time a combination of AI and upconversion nanoparticle-based lateral flow assays (UCNP-LFAs) for the quantitative detection of commercial internet of things (IoT) devices. This universal UCNPs quantitative detection strategy combines high accuracy, sensitivity, and applicability in the field detection environment. By using transfer learning to train AI models in a small self-built database, we not only significantly improved the accuracy and robustness of quantitative detection, but also efficiently solved the actual problems of data scarcity and low computing power of POCT equipment. Then, the trained AI model was deployed in IoT devices, whereby the detection process does not require detailed data preprocessing to achieve real-time inference of quantitative results. We validated the quantitative detection of two detectors using eight transfer learning models on a small dataset. The AI quickly provided ultra-high accuracy prediction results (some models could reach 100% accuracy) even when strong noise was added. Simultaneously, the high flexibility of this strategy promises to be a general quantitative detection method for optical biosensors. We believe that this strategy and device have a scientific significance in revolutionizing the existing POCT technology landscape and providing excellent commercial value in the in vitro diagnostics (IVD) industry.
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Affiliation(s)
- Wei Wang
- School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Kuo Chen
- School of Software Engineering, Chongqing University of Posts and Telecommunications,Chongqing 400065, China
| | - Xing Ma
- School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Jinhong Guo
- School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
- The M.O.E. Key Laboratory of Laboratory Medical Diagnostics, The College of Laboratory Medicine, Chongqing Medical University, Chongqing 400016, China
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7
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Brosamer K, Kourentzi K, Willson RC, Vu BV. Glowstick-inspired smartphone-readable reporters for sensitive, multiplexed lateral flow immunoassays. COMMUNICATIONS ENGINEERING 2023; 2:31. [PMID: 38586601 PMCID: PMC10955955 DOI: 10.1038/s44172-023-00075-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 04/25/2023] [Indexed: 04/09/2024]
Abstract
The COVID-19 pandemic has increased demand for point-of-care (POC) screening tests such as lateral flow assays (LFAs) and highlighted the need for sensitive and cost-effective POC diagnostic platforms. Here, we demonstrate an LFA platform using standard fluorescent nanoparticle reporters in which optical excitation is replaced by chemical excitation using the peroxyoxalate-based chemistry of inexpensive, shelf-stable glowsticks. The one-step chemi-excitation of fluorescent particles produces visible light readable by an unmodified smartphone, enhancing sensitivity while preserving simplicity and cost-effectiveness. Our Glow LFA detected the common model analyte human chorionic gonadotropin with a limit of detection (LoD) of 39 pg/mL-over ten times more sensitive than standard gold nanoparticles using the same antibodies. We also demonstrate its application to the detection of SARS-CoV-2 nucleoprotein at 100 pg/mL in nasal swab extract. Multiple fluorescent dyes can be chemi-excited by a single reagent, allowing for color multiplexing on a single LFA strip with a smartphone camera. The detection of three analytes on a single LFA test line was demonstrated using red, green, and blue fluorescent reporter particles, making glow LFA a promising platform for multiplexed detection.
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Affiliation(s)
- Kristen Brosamer
- Department of Biomedical Engineering, University of Houston, Houston, TX 77204, USA
| | - Katerina Kourentzi
- William A. Brookshire Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204, USA
| | - Richard C. Willson
- Department of Biomedical Engineering, University of Houston, Houston, TX 77204, USA
- William A. Brookshire Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204, USA
- Escuela de Medicina y Ciencias de Salud, Tecnológico de Monterrey, Monterrey, Nuevo León 64710, Mexico
| | - Binh V. Vu
- William A. Brookshire Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204, USA
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8
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Seo SE, Ryu E, Kim J, Shin CJ, Kwon OS. Fluorophore-encapsulated nanobeads for on-site, rapid, and sensitive lateral flow assay. SENSORS AND ACTUATORS. B, CHEMICAL 2023; 381:133364. [PMID: 36684645 PMCID: PMC9838036 DOI: 10.1016/j.snb.2023.133364] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 01/12/2023] [Accepted: 01/12/2023] [Indexed: 05/09/2023]
Abstract
Since December 2019, the rapid and sensitive detection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has become a priority for public health. Although the lateral flow assay (LFA) sensor has emerged as a rapid and on-site SARS-CoV-2 detection technique, the conventional approach of using gold nanoparticles for the signaling probe had limitations in increasing the sensitivity of the sensor. Herein, our newly suggested methodology to improve the performance of the LFA system could amplify the sensor signal with a facile fabrication method by concentrating fluorescent organic molecules. A large Stokes shift fluorophore (single benzene) was encapsulated into polystyrene nanobeads to enhance the fluorescence intensity of the probe for LFA sensor, which was detected on the test line with a longpass filter under ultraviolet light irradiation. This approach provides comparatively high sensitivity with the limit of detection of 1 ng mL-1 for the SARS-CoV-2 spike protein and a fast detection process, which takes less than 20 min. Furthermore, our sensor showed higher performance than gold nanoparticle-based commercial rapid diagnostics test kits in clinical tests, proving that this approach is more suitable and reliable for the sensitive and rapid detection of viruses, bacteria, and other hazardous materials.
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Key Words
- Ab, Antibody
- Ag, Antigen
- AuNP, Gold nanoparticle
- CL, Control line
- CT, Threshold cycle
- LFA, Lateral flow assay
- LOD, Limit of detection
- PCR, Polymerase chain reaction
- PS, Polystyrene
- RDT, Rapid diagnostic test
- SARS-CoV-2, Severe acute respiratory syndrome coronavirus 2
- SB, Single Benzene
- TL, Test line
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Affiliation(s)
- Sung Eun Seo
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, South Korea
| | - Eunsu Ryu
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, South Korea
| | - Jinyeong Kim
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, South Korea
| | - Chan Jae Shin
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, South Korea
- Department of Biotechnology, University of Science & Technology (UST), Daejeon 34141, South Korea
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, South Korea
| | - Oh Seok Kwon
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, South Korea
- Department of Biotechnology, University of Science & Technology (UST), Daejeon 34141, South Korea
- College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon 16419, South Korea
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, South Korea
- Department of Nano Engineering, Sungkyunkwan University, Suwon 16419, South Korea
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Qian J, Zhang Q, Lu M. Integration of on-chip lysis and paper-based sensor for rapid detection of viral and exosomal RNAs. Biosens Bioelectron 2023; 226:115114. [PMID: 36753990 DOI: 10.1016/j.bios.2023.115114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 01/15/2023] [Accepted: 01/30/2023] [Indexed: 02/04/2023]
Abstract
In recent years, paper-based nucleic acid sensors have been demonstrated for the ability to detect DNA and RNA molecules extracted from viruses and bacteria. In clinical samples, these nucleic acids are mostly encapsulated in lipid membranes and need to be released before being analyzed using paper-based sensors. For the nucleic acid amplification tests (NAATs), it is also desirable to remove the interfering molecules that can inhibit the nucleic acid amplification. To achieve a field deployable NAAT, we report a portable sensor system that combines the thermolysis and paper-based NAATs to detect target RNA molecules carried by viral and exosomal nanoparticles. The sensor cartridge includes a lysis chamber with a pressure-controlled diaphragm valve, paper flow channels, and three paper-based NAAT reaction chambers to extract, transport, and detect nucleic acids respectively. A compact instrument was prototyped to automate the assay, collect fluorescence images of the nucleic acid amplification, and generate amplification curves for NAATs. The pump-free and paper-based sensor achieved quantitative analysis of influenza A virus (IAV) RNA and exosome microRNA within 1 h, with the lowest detect concentration of 104 TCID50/mL and 106 EV/mL for IAV and exosome, respectively. Owing to the advantages of easy storage, simple operation, and low cost, such as system has great potential to be used as a point-of-care test for in-field diagnosis of viral and bacterial infections.
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Affiliation(s)
- Jingjing Qian
- Department of Electrical and Computer Engineering, Iowa State University, Ames, IA 50011, USA
| | - Qinming Zhang
- Department of Electrical and Computer Engineering, Iowa State University, Ames, IA 50011, USA
| | - Meng Lu
- Department of Electrical and Computer Engineering, Iowa State University, Ames, IA 50011, USA; Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA.
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Gumus E, Bingol H, Zor E. Lateral flow assays for detection of disease biomarkers. J Pharm Biomed Anal 2023; 225:115206. [PMID: 36586382 DOI: 10.1016/j.jpba.2022.115206] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 12/06/2022] [Accepted: 12/16/2022] [Indexed: 12/24/2022]
Abstract
Early diagnosis saves lives in many diseases. In this sense, monitoring of biomarkers is crucial for the diagnosis of diseases. Lateral flow assays (LFAs) have attracted great attention among paper-based point-of-care testing (POCT) due to their low cost, user-friendliness, and time-saving advantages. Developments in the field of health have led to an increase of interest in these rapid tests. LFAs are used in the diagnosis and monitoring of many diseases, thanks to biomarkers that can be observed in body fluids. This review covers the recent advances dealing with the design and strategies for the development of LFA for the detection of biomarkers used in clinical applications in the last 5 years. We focus on various strategies such as choosing the nanoparticle type, single or multiple test approaches, and equipment for signal transducing for the detection of the most common biomarkers in different diseases such as cancer, cardiovascular, infectious, and others including Parkinson's and Alzheimer's diseases. We expect that this study will contribute to the different approaches in LFA and pave the way for other clinical applications.
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Affiliation(s)
- Eda Gumus
- Biomaterials and Biotechnology Laboratory, Science and Technology Research and Application Center (BITAM), Necmettin Erbakan University, 42140 Konya, Turkey
| | - Haluk Bingol
- Biomaterials and Biotechnology Laboratory, Science and Technology Research and Application Center (BITAM), Necmettin Erbakan University, 42140 Konya, Turkey; Department of Chemistry Education, A.K. Education Faculty, Necmettin Erbakan University, 42090 Konya, Turkey
| | - Erhan Zor
- Biomaterials and Biotechnology Laboratory, Science and Technology Research and Application Center (BITAM), Necmettin Erbakan University, 42140 Konya, Turkey; Department of Science Education, A.K. Education Faculty, Necmettin Erbakan University, 42090 Konya, Turkey.
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11
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Mattiello CJ, Stickle DF. Characterization by image analysis of the dose vs response curve for a qualitative serum hCG lateral flow immunoassay. Clin Chim Acta 2023; 538:175-180. [PMID: 36423702 DOI: 10.1016/j.cca.2022.11.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 11/15/2022] [Accepted: 11/17/2022] [Indexed: 11/23/2022]
Abstract
BACKGROUND As an adjunct to verification of performance characteristics of a qualitative serum hCG lateral flow immunoassay (LFI), we performed image analysis to characterize the dose vs response curve (visibility of the test line), as a means of understanding the transition from negative to positive as a function of increasing [hCG]. METHODS Using serum samples of known [hCG], device images were obtained using a scanner at the prescribed reading time (5 min). Image analysis (using Python and R) was used to obtain the integral (S) of the test-line color as a function of [hCG]. RESULTS Data for S as a function of [hCG] were well characterized by a simple hyperbola: S = Smax [hCG]/([hCG] + K), where K = 202 mIU/ml (r = 0.997). Replicates of S at K had CV of 7.3 %. By eye, uncertainty of test results among users occurred only below the assay's stated sensitivity of 10 mIU/ml, in region of S < 3 % of Smax, and signal:noise ratio < 3. CONCLUSIONS By image analysis, the dose vs response (Test line integral) for this qualitative serum hCG LFI was a simple hyperbola. Characterization of the dose vs response curve was useful in verification of the assay's performance characteristics.
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12
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Sarkar S, Gogoi M, Mahato M, Joshi AB, Baruah AJ, Kodgire P, Boruah P. Biosensors for detection of prostate cancer: a review. Biomed Microdevices 2022; 24:32. [PMID: 36169742 DOI: 10.1007/s10544-022-00631-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/19/2022] [Indexed: 11/26/2022]
Abstract
Diagnosis of prostate cancer (PC) has posed a challenge worldwide due to the sophisticated and costly diagnostics tools, which include DRE, TRUS, GSU, PET/CT scan, MRI, and biopsy. These diagnostic techniques are very helpful in the detection of PCs; however, all the techniques have their serious limitations. Biosensors are easier to fabricate and do not require any cutting-edge technology as required for other imaging techniques. In this regard, point-of-care (POC) biosensors are important due to their portability, convenience, low cost, and fast procedure. This review explains the various existing diagnostic tools for the detection of PCs and the limitation of these methods. It also focuses on the recent studies on biosensors technologies as an alternative to the conventional diagnostic techniques for the detection of PCs.
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Affiliation(s)
- Sourav Sarkar
- Department of Biomedical Engineering, North-Eastern Hill University, Shillong, 793022, Meghalaya, India
| | - Manashjit Gogoi
- Department of Biomedical Engineering, North-Eastern Hill University, Shillong, 793022, Meghalaya, India.
| | - Mrityunjoy Mahato
- Physics Division, Department of Basic Sciences and Social Sciences, North-Eastern Hill University, Shillong, 793022, Meghalaya, India
| | - Abhijeet Balwantrao Joshi
- Biosciences and Biomedical Engineering, Indian Institute of Technology, Indore-453552, Madhya Pradesh, India
| | - Arup Jyoti Baruah
- Department of General Surgery, North Eastern Indira Gandhi Regional Institute of Health and Medical Sciences, Shillong, Meghalaya, India
| | - Prashant Kodgire
- Biosciences and Biomedical Engineering, Indian Institute of Technology, Indore-453552, Madhya Pradesh, India
| | - Polina Boruah
- Department of Biochemistry, North Eastern Indira Gandhi Regional Institute of Health and Medical Sciences, Shillong-793018, Meghalaya, India
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13
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McRae MP, Rajsri KS, Alcorn TM, McDevitt JT. Smart Diagnostics: Combining Artificial Intelligence and In Vitro Diagnostics. SENSORS (BASEL, SWITZERLAND) 2022; 22:6355. [PMID: 36080827 PMCID: PMC9459970 DOI: 10.3390/s22176355] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 08/12/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
We are beginning a new era of Smart Diagnostics-integrated biosensors powered by recent innovations in embedded electronics, cloud computing, and artificial intelligence (AI). Universal and AI-based in vitro diagnostics (IVDs) have the potential to exponentially improve healthcare decision making in the coming years. This perspective covers current trends and challenges in translating Smart Diagnostics. We identify essential elements of Smart Diagnostics platforms through the lens of a clinically validated platform for digitizing biology and its ability to learn disease signatures. This platform for biochemical analyses uses a compact instrument to perform multiclass and multiplex measurements using fully integrated microfluidic cartridges compatible with the point of care. Image analysis digitizes biology by transforming fluorescence signals into inputs for learning disease/health signatures. The result is an intuitive Score reported to the patients and/or providers. This AI-linked universal diagnostic system has been validated through a series of large clinical studies and used to identify signatures for early disease detection and disease severity in several applications, including cardiovascular diseases, COVID-19, and oral cancer. The utility of this Smart Diagnostics platform may extend to multiple cell-based oncology tests via cross-reactive biomarkers spanning oral, colorectal, lung, bladder, esophageal, and cervical cancers, and is well-positioned to improve patient care, management, and outcomes through deployment of this resilient and scalable technology. Lastly, we provide a future perspective on the direction and trajectory of Smart Diagnostics and the transformative effects they will have on health care.
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Affiliation(s)
- Michael P. McRae
- Department of Molecular Pathobiology, Division of Biomaterials, Bioengineering Institute, New York University College of Dentistry, 433 First Ave. Rm 822, New York, NY 10010, USA
| | - Kritika S. Rajsri
- Department of Molecular Pathobiology, Division of Biomaterials, Bioengineering Institute, New York University College of Dentistry, 433 First Ave. Rm 822, New York, NY 10010, USA
- Department of Pathology, Vilcek Institute, New York University School of Medicine, 160 E 34th St, New York, NY 10016, USA
| | - Timothy M. Alcorn
- Latham BioPharm Group, 6810 Deerpath Rd Suite 405, Elkridge, MD 21075, USA
| | - John T. McDevitt
- Department of Molecular Pathobiology, Division of Biomaterials, Bioengineering Institute, New York University College of Dentistry, 433 First Ave. Rm 822, New York, NY 10010, USA
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14
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Danthanarayana AN, Brgoch J, Willson RC. Photoluminescent Molecules and Materials as Diagnostic Reporters in Lateral Flow Assays. ACS APPLIED BIO MATERIALS 2022; 5:82-96. [PMID: 35014811 PMCID: PMC9798899 DOI: 10.1021/acsabm.1c01051] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The lateral flow assay (LFA) is a point-of-care diagnostic test commonly available in an over-the-counter format because of its simplicity, speed, low cost, and portability. The reporter particles in these assays are among their most significant components because they perform the diagnostic readout and dictate the test's sensitivity. Today, gold nanoparticles are frequently used as reporters, but recent work focusing on photoluminescent-based reporter technologies has pushed LFAs to better performance. These efforts have focused specifically on reporters made of organic fluorophores, quantum dots, lanthanide chelates, persistent luminescent phosphors, and upconversion phosphors. In most cases, photoluminescent reporters show enhanced sensitivity compared to conventional gold nanoparticle-based assays. Here, we examine the advantages and disadvantages of these different reporters and highlight their potential benefits in LFAs. Our assessment shows that photoluminescent-based LFAs can not only reach lower detection limits than LFAs with traditional reporters, but they also can be capable of quantitative and multiplex analyte detection. As a result, the photoluminescent reporters make LFAs well-suited for medical diagnostics, the food and agricultural industry, and environmental testing.
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Affiliation(s)
| | - Jakoah Brgoch
- Department of Chemistry, University of Houston, Houston, Texas 77204, USA
| | - Richard C. Willson
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, USA,Department of Biology and Biochemistry, University of Houston, Houston, Texas 77204, USA
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15
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Belsare S, Tseng D, Ozcan A, Coté G. Monitoring gestational diabetes at the point-of-care via dual glycated albumin lateral flow assays in conjunction with a handheld reader. Analyst 2022; 147:5518-5527. [DOI: 10.1039/d2an01238c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A dual assay cartridge was developed and used in conjunction with a handheld reader for sensing % glycated albumin to monitor gestational diabetes at home.
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Affiliation(s)
- Sayali Belsare
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Derek Tseng
- Electrical and Computer Engineering Department, University of California, Los Angeles, CA, USA
| | - Aydogan Ozcan
- Electrical and Computer Engineering Department, University of California, Los Angeles, CA, USA
- Bioengineering Department, University of California, Los Angeles, CA, USA
| | - Gerard Coté
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
- Texas Engineering Experiment Station Centre for Remote Health Technologies and Systems, College Station, TX, USA
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16
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Bock S, Kim HM, Kim J, An J, Choi YS, Pham XH, Jo A, Ham KM, Song H, Kim JW, Hahm E, Rho WY, Lee SH, Park SM, Lee S, Jeong DH, Lee HY, Jun BH. Lateral Flow Immunoassay with Quantum-Dot-Embedded Silica Nanoparticles for Prostate-Specific Antigen Detection. NANOMATERIALS 2021; 12:nano12010033. [PMID: 35009984 PMCID: PMC8746978 DOI: 10.3390/nano12010033] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/18/2021] [Accepted: 12/20/2021] [Indexed: 01/04/2023]
Abstract
Prostate cancer can be detected early by testing the presence of prostate-specific antigen (PSA) in the blood. Lateral flow immunoassay (LFIA) has been used because it is cost effective and easy to use and also has a rapid sample-to-answer process. Quantum dots (QDs) with very bright fluorescence have been previously used to improve the detection sensitivity of LFIAs. In the current study, a highly sensitive LFIA kit was devised using QD-embedded silica nanoparticles. In the present study, only a smartphone and a computer software program, ImageJ, were used, because the developed system had high sensitivity by using very bright nanoprobes. The limit of PSA detection of the developed LFIA system was 0.138 ng/mL. The area under the curve of this system was calculated as 0.852. The system did not show any false-negative result when 47 human serum samples were analyzed; it only detected PSA and did not detect alpha-fetoprotein and newborn calf serum in the samples. Additionally, fluorescence was maintained on the strip for 10 d after the test. With its high sensitivity and convenience, the devised LFIA kit can be used for the diagnosis of prostate cancer.
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Affiliation(s)
- Sungje Bock
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Korea; (S.B.); (H.-M.K.); (J.K.); (J.A.); (X.-H.P.); (A.J.); (K.-m.H.); (E.H.)
| | - Hyung-Mo Kim
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Korea; (S.B.); (H.-M.K.); (J.K.); (J.A.); (X.-H.P.); (A.J.); (K.-m.H.); (E.H.)
| | - Jaehi Kim
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Korea; (S.B.); (H.-M.K.); (J.K.); (J.A.); (X.-H.P.); (A.J.); (K.-m.H.); (E.H.)
| | - Jaehyun An
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Korea; (S.B.); (H.-M.K.); (J.K.); (J.A.); (X.-H.P.); (A.J.); (K.-m.H.); (E.H.)
- BioSquare Inc., Hwaseong 18449, Korea; (H.S.); (J.-W.K.)
| | - Yun-Sik Choi
- Department of Chemistry Education, Seoul National University, Seoul 08826, Korea; (Y.-S.C.); (D.H.J.)
| | - Xuan-Hung Pham
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Korea; (S.B.); (H.-M.K.); (J.K.); (J.A.); (X.-H.P.); (A.J.); (K.-m.H.); (E.H.)
| | - Ahla Jo
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Korea; (S.B.); (H.-M.K.); (J.K.); (J.A.); (X.-H.P.); (A.J.); (K.-m.H.); (E.H.)
| | - Kyeong-min Ham
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Korea; (S.B.); (H.-M.K.); (J.K.); (J.A.); (X.-H.P.); (A.J.); (K.-m.H.); (E.H.)
| | - Hobeom Song
- BioSquare Inc., Hwaseong 18449, Korea; (H.S.); (J.-W.K.)
| | - Jung-Won Kim
- BioSquare Inc., Hwaseong 18449, Korea; (H.S.); (J.-W.K.)
| | - Eunil Hahm
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Korea; (S.B.); (H.-M.K.); (J.K.); (J.A.); (X.-H.P.); (A.J.); (K.-m.H.); (E.H.)
| | - Won-Yeop Rho
- School of International Engineering and Science, Jeonbuk National University, Jeonju 54896, Korea;
| | - Sang Hun Lee
- Department of Chemical and Biological Engineering, Hanbat National University, Deajeon 34158, Korea;
| | - Seung-min Park
- Department of Urology, Stanford University School of Medicine, Palo Alto, CA 94305, USA;
| | - Sangchul Lee
- Department of Urology, Seoul National University Bundang Hospital, Seongnam 13620, Korea;
| | - Dae Hong Jeong
- Department of Chemistry Education, Seoul National University, Seoul 08826, Korea; (Y.-S.C.); (D.H.J.)
| | - Ho-Young Lee
- Department of Nuclear Medicine, Seoul National University Bundang Hospital, Seongnam 13620, Korea
- Correspondence: (H.-Y.L.); (B.-H.J.); Tel.: +82-31-787-2938 (H.-Y.L.); +82-2-450-0521 (B.-H.J.)
| | - Bong-Hyun Jun
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Korea; (S.B.); (H.-M.K.); (J.K.); (J.A.); (X.-H.P.); (A.J.); (K.-m.H.); (E.H.)
- Correspondence: (H.-Y.L.); (B.-H.J.); Tel.: +82-31-787-2938 (H.-Y.L.); +82-2-450-0521 (B.-H.J.)
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17
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VEGF Detection via Simplified FLISA Using a 3D Microfluidic Disk Platform. BIOSENSORS-BASEL 2021; 11:bios11080270. [PMID: 34436072 PMCID: PMC8393963 DOI: 10.3390/bios11080270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 08/02/2021] [Accepted: 08/06/2021] [Indexed: 12/03/2022]
Abstract
Fluorescence-linked immunosorbent assay (FLISA) is a commonly used, quantitative technique for detecting biochemical changes based on antigen–antibody binding reactions using a well-plate platform. As the manufacturing technology of microfluidic system evolves, FLISA can be implemented onto microfluidic disk platforms which allows the detection of trace biochemical reactions with high resolutions. Herein, we propose a novel microfluidic system comprising a disk with a three-dimensional incubation chamber, which can reduce the amount of the reagents to 1/10 and the required time for the entire process to less than an hour. The incubation process achieves an antigen–antibody binding reaction as well as the binding of fluorogenic substrates to target proteins. The FLISA protocol in the 3D incubation chamber necessitates performing the antibody-conjugated microbeads’ movement during each step in order to ensure sufficient binding reactions. Vascular endothelial growth factor as concentration with ng mL−1 is detected sequentially using a benchtop process employing this 3D microfluidic disk. The 3D microfluidic disk works without requiring manual intervention or additional procedures for liquid control. During the incubation process, microbead movement is controlled by centrifugal force from the rotating disk and the sedimentation by gravitational force at the tilted floor of the chamber.
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18
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Cuny AP, Rudolf F, Ponti A. pyPOCQuant - A tool to automatically quantify Point-Of-Care Tests from images. SOFTWAREX 2021; 15:100710. [PMID: 36568894 PMCID: PMC9758393 DOI: 10.1016/j.softx.2021.100710] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 04/19/2021] [Accepted: 05/13/2021] [Indexed: 06/17/2023]
Abstract
Lateral flow Point-Of-Care Tests (POCTs) are a valuable tool for rapidly detecting pathogens and the associated immune response in humans and animals. In the context of the SARS-CoV-2 pandemic, they offer rapid on-site diagnostics and can relieve centralized laboratory testing sites, thus freeing resources that can be focused on especially vulnerable groups. However, visual interpretation of the POCT test lines is subjective, error prone and only qualitative. Here we present pyPOCQuant, an open-source tool implemented in Python 3 that can robustly and reproducibly analyze POCTs from digital images and return an unbiased and quantitative measurement of the POCT test lines.
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Affiliation(s)
- Andreas P Cuny
- ETH Zurich, Department of Biosystems Science and Engineering, Mattenstr. 26, 4058 Basel, Switzerland
- Swiss Institute of Bioinformatics, Mattenstr. 26, 4058 Basel, Switzerland
| | - Fabian Rudolf
- ETH Zurich, Department of Biosystems Science and Engineering, Mattenstr. 26, 4058 Basel, Switzerland
- Swiss Institute of Bioinformatics, Mattenstr. 26, 4058 Basel, Switzerland
| | - Aaron Ponti
- ETH Zurich, Department of Biosystems Science and Engineering, Mattenstr. 26, 4058 Basel, Switzerland
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19
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Bheemavarapu LP, Shah MI, Joseph J, Sivaprakasam M. IQVision: An Image-Based Evaluation Tool for Quantitative Lateral Flow Immunoassay Kits. BIOSENSORS-BASEL 2021; 11:bios11070211. [PMID: 34203515 PMCID: PMC8428085 DOI: 10.3390/bios11070211] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 06/23/2021] [Accepted: 06/24/2021] [Indexed: 12/12/2022]
Abstract
The development of quantitative lateral flow immunoassay test strips involves a lot of research from kit manufacturers’ standpoint. Kit providers need to evaluate multiple parameters, including the location of test regions, sample flow speed, required sample volumes, reaction stability time, etc. A practical visualization tool assisting manufacturers in this process is very much required for the design of more sensitive and reliable quantitative LFIA test strips. In this paper, we present an image-based quantitative evaluation tool determining the practical functionality of fluorescence-labelled LFIA test cartridges. Image processing-based algorithms developed and presented in this paper provide a practical analysis of sample flow rates, reaction stability times of samples under test, and detect any abnormalities in test strips. Evaluation of the algorithm is done with Glycated Hemoglobin (HbA1C) and Vitamin D test cartridges. Practical sample flow progress for HbA1C test cartridges is demonstrated. The reaction stability time of HbA1C test samples is measured to be 12 min, while that of Vitamin D test samples is 24 min. Experimental evaluation of the abnormality detection algorithm is carried out, and sample flow abnormalities are detected with 100% accuracy while membrane irregularities are detected with 96% accuracy.
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Affiliation(s)
- Lalitha Pratyusha Bheemavarapu
- Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, India; (J.J.); (M.S.)
- Correspondence:
| | - Malay Ilesh Shah
- Healthcare Technology Innovation Centre (HTIC), Indian Institute of Technology Madras, Chennai 600036, India;
| | - Jayaraj Joseph
- Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, India; (J.J.); (M.S.)
| | - Mohanasankar Sivaprakasam
- Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, India; (J.J.); (M.S.)
- Healthcare Technology Innovation Centre (HTIC), Indian Institute of Technology Madras, Chennai 600036, India;
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20
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Portable Chemiluminescence-Based Lateral Flow Assay Platform for the Detection of Cortisol in Human Serum. BIOSENSORS-BASEL 2021; 11:bios11060191. [PMID: 34200643 PMCID: PMC8226682 DOI: 10.3390/bios11060191] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Revised: 04/06/2021] [Accepted: 06/08/2021] [Indexed: 12/14/2022]
Abstract
In this study, we developed the portable chemiluminescence (CL)-based lateral flow assay (LFA) platform for the detection of cortisol in human serum. Cortisol is well-known as a stress hormone due to its high relevancy for human mental and physical health, such as hypertension or depression. To date, a number of optical devices have provided the sensitive determination of levels of analytes. However, this modality type still requires costly optical modules. The developed CL platform is simply composed of two detection modules along with a loading part for the LFA strip. The LFA membrane contains gold nanoparticle probes conjugated with antibodies against cortisol and horseradish peroxidase (HRP), which can also efficiently increase the luminescent signal by providing many areas for anti-cortisol antibody and HRP. The measured voltage signals coming from the photodiode in a CL reader were compared with a standard microplate reader for the evaluation of accuracy. The linear range observed for cortisol was measured to be 0.78–12.5 μg/dL (R2 = 0.99) with a limit of detection (LOD) of 0.342 μg/dL. In addition, the CL-LFA reader showed a high correlation (R2 = 0.96) with the standard cortisol console (COBAS 8000, Roche), suggesting that our developed CL-based LFA platform can be usable in situ.
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21
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Brunauer A, Verboket RD, Kainz DM, von Stetten F, Früh SM. Rapid Detection of Pathogens in Wound Exudate via Nucleic Acid Lateral Flow Immunoassay. BIOSENSORS-BASEL 2021; 11:bios11030074. [PMID: 33800856 PMCID: PMC8035659 DOI: 10.3390/bios11030074] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 02/24/2021] [Accepted: 03/03/2021] [Indexed: 12/15/2022]
Abstract
The rapid detection of pathogens in infected wounds can significantly improve the clinical outcome. Wound exudate, which can be collected in a non-invasive way, offers an attractive sample material for the detection of pathogens at the point-of-care (POC). Here, we report the development of a nucleic acid lateral flow immunoassay for direct detection of isothermally amplified DNA combined with fast sample preparation. The streamlined protocol was evaluated using human wound exudate spiked with the opportunistic pathogen Pseudomonas aeruginosa that cause severe health issues upon wound colonization. A detection limit of 2.1 × 105 CFU per mL of wound fluid was achieved, and no cross-reaction with other pathogens was observed. Furthermore, we integrated an internal amplification control that excludes false negative results and, in combination with the flow control, ensures the validity of the test result. The paper-based approach with only three simple hands-on steps has a turn-around time of less than 30 min and covers the complete analytical process chain from sample to answer. This newly developed workflow for wound fluid diagnostics has tremendous potential for reliable pathogen POC testing and subsequent target-oriented therapy.
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Affiliation(s)
- Anna Brunauer
- Laboratory for MEMS Applications, IMTEK-Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
| | - René D Verboket
- Department of Trauma-, Hand- and Reconstructive Surgery, University Hospital Frankfurt, Johann Wolfgang Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Daniel M Kainz
- Laboratory for MEMS Applications, IMTEK-Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
- Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
| | - Felix von Stetten
- Laboratory for MEMS Applications, IMTEK-Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
- Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
| | - Susanna M Früh
- Laboratory for MEMS Applications, IMTEK-Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
- Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
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22
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Low JSY, Thevarajah TM, Chang SW, Goh BT, Khor SM. Biosensing based on surface-enhanced Raman spectroscopy as an emerging/next-generation point-of-care approach for acute myocardial infarction diagnosis. Crit Rev Biotechnol 2020; 40:1191-1209. [PMID: 32811205 DOI: 10.1080/07388551.2020.1808582] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Cardiovascular disease is a major global health issue. In particular, acute myocardial infarction (AMI) requires urgent attention and early diagnosis. The use of point-of-care diagnostics has resulted in the improved management of cardiovascular disease, but a major drawback is that the performance of POC devices does not rival that of central laboratory tests. Recently, many studies and advances have been made in the field of surface-enhanced Raman scattering (SERS), including the development of POC biosensors that utilize this detection method. Here, we present a review of the strengths and limitations of these emerging SERS-based biosensors for AMI diagnosis. The ability of SERS to multiplex sensing against existing POC detection methods are compared and discussed. Furthermore, SERS calibration-free methods that have recently been explored to minimize the inconvenience and eliminate the limitations caused by the limited linear range and interassay differences found in the calibration curves are outlined. In addition, the incorporation of artificial intelligence (AI) in SERS techniques to promote multivariate analysis and enhance diagnostic accuracy are discussed. The future prospects for SERS-based POC devices that include wearable POC SERS devices toward predictive, personalized medicine following the Fourth Industrial Revolution are proposed.
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Affiliation(s)
- Joyce Siew Yong Low
- Faculty of Science, Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | - T Malathi Thevarajah
- Faculty of Medicine, Department of Pathology, University of Malaya, Kuala Lumpur, Malaysia
| | - Siow Wee Chang
- Faculty of Science, Institute of Biological Sciences, University of Malaya, Kuala Lumpur, Malaysia
| | - Boon Tong Goh
- Faculty of Science, Low Dimensional Materials Research Centre, Department of Physics, University of Malaya, Kuala Lumpur, Malaysia
| | - Sook Mei Khor
- Faculty of Science, Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia.,Faculty of Engineering, Centre for Innovation in Medical Engineering, University of Malaya, Kuala Lumpur, Malaysia
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23
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Lee J, Kim H, Heo Y, Yoo YK, Han SI, Kim C, Hur D, Kim H, Kang JY, Lee JH. Enhanced paper-based ELISA for simultaneous EVs/exosome isolation and detection using streptavidin agarose-based immobilization. Analyst 2020; 145:157-164. [PMID: 31723951 DOI: 10.1039/c9an01140d] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
EVs/exosomes are considered as the next generation of biomarkers, including for liquid biopsies. Consequently, the quantification of EVs/exosomes is crucial for facilitating EV/exosome research and applications. Paper-based enzyme-linked immunosorbent assay (p-ELISA) is a portable diagnostic system with low cost that is simple and easy to use; however, it shows low sensitivity and linearity. In this study, we develop p-ELISA for targeting EVs/exosomes by using streptavidin agarose resin-based immobilization (SARBI). This method reduces assay preparation times, provides strong binding, and retains good sensitivity and linearity. The time required for the total assay, including preparation steps and surface immobilization, was shortened to ∼2 h. We evaluated SARBI p-ELISA systems with/without CD63 capture Ab and then with fetal bovine serum (FBS) and EVs/exosome-depleted fetal bovine serum (dFBS). The results provide evidence supporting the selective capture ability of SARBI p-ELISA. We obtain semiquantitative p-ELISA results using an exosome standard (ES) and human serum (HS), with R2 values of 0.95 and 0.92, respectively.
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Affiliation(s)
- Junwoo Lee
- Department of Electrical Engineering, Kwangwoon University, Seoul 01897, Republic of Korea.
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24
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Calabretta MM, Zangheri M, Lopreside A, Marchegiani E, Montali L, Simoni P, Roda A. Precision medicine, bioanalytics and nanomaterials: toward a new generation of personalized portable diagnostics. Analyst 2020; 145:2841-2853. [PMID: 32196042 DOI: 10.1039/c9an02041a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The customization of disease treatment focused on genetic, environmental and lifestyle factors of individual patients, including tailored medical decisions and treatments, is identified as precision medicine. This approach involves the combination of various aspects such as the collection and processing of a large amount of data, the selection of optimized and personalized drug dosage for each patient and the development of selective and reliable analytical tools for the monitoring of clinical, genetic and environmental parameters. In this context, miniaturized, compact and ultrasensitive bioanalytical devices play a crucial role for achieving the goals of personalized medicine. In this review, the latest analytical technologies suitable for providing portable and easy-to-use diagnostic tools in clinical settings will be discussed, highlighting new opportunities arising from nanotechnologies, offering peculiar perspectives and opportunities for precision medicine.
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Affiliation(s)
- Maria Maddalena Calabretta
- Department of Chemistry, Alma Mater Studiorum - University of Bologna, Via Selmi 2, 40126 Bologna, Italy.
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Solaimuthu A, Vijayan AN, Murali P, Korrapati PS. Nano-biosensors and their relevance in tissue engineering. CURRENT OPINION IN BIOMEDICAL ENGINEERING 2020. [DOI: 10.1016/j.cobme.2019.12.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Danthanarayana AN, Finley E, Vu B, Kourentzi K, Willson RC, Brgoch J. A multicolor multiplex lateral flow assay for high-sensitivity analyte detection using persistent luminescent nanophosphors. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2020; 12:272-280. [PMID: 32577135 PMCID: PMC7310964 DOI: 10.1039/c9ay02247c] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Incorporating two persistent luminescent nanophosphors (PLNPs), green-emitting SrAl2O4:Eu2+,Dy3+ (SAO) and blue-emitting (Sr0.625Ba0.375)2MgSi2O7:Eu2+,Dy3+ (SBMSO), in a single lateral flow assay (LFA) establishes a luminescence-based, multiplex point-of-need test capable of simultaneously detecting two different analytes in a single sample. The advantages of this system are the high sensitivity and photostability of PLNPs, while only requiring access to minimal hardware and a smartphone for signal detection. The PLNPs were obtained by first wet milling bulk synthesized phosphor powders, followed by fractionation using differential centrifugal sedimentation to obtain monodisperse nanoparticles. A modified Stöber process was then employed to encapsulate the nanoparticles in a water-stable silica shell followed by attaching antibodies to the particles' surfaces using reductive amination chemistry. The resulting PLNPs were incorporated in an LFA to concurrently detect two independent model analytes, prostate-specific antigen (PSA) and human chorionic gonadotropin (hCG). The multicolor-multiplex PLNP-based assays were finally imaged using a smartphone-based imaging system with excellent detection limits (0.1 ng mL-1 of PSA and 1 ng mL-1 of hCG) that are competitive with commercially available LFAs.
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Affiliation(s)
| | - Erin Finley
- Department of Chemistry, University of Houston, Houston, Texas 77204, USA
| | - Binh Vu
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, USA
| | - Katerina Kourentzi
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, USA
| | - Richard C Willson
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, USA
- Department of Biology and Biochemistry, University of Houston, Houston, Texas 77204, USA
- Escuela de Medicina y Ciencias de Salud, Tecnológico de Monterrey, Monterrey, Nuevo León 64710, Mexico
| | - Jakoah Brgoch
- Department of Chemistry, University of Houston, Houston, Texas 77204, USA
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Sun Q, Zheng W, Lin C, Shen D. A Low-Cost Micro-Volume Nephelometric System for Quantitative Immunoagglutination Assays. SENSORS 2019; 19:s19204359. [PMID: 31600932 PMCID: PMC6832725 DOI: 10.3390/s19204359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 09/29/2019] [Accepted: 10/02/2019] [Indexed: 12/11/2022]
Abstract
Immunoassays have been widely used in scientific research and clinical diagnosis due to their versatile detection capability and high specificity. Immunoagglutination assays are kinds of immunoassay, which can simply and rapidly measure the concentration of analytes. In this work, we developed a low-cost micro-volume nephelometric system for quantitative immunoagglutination assays. We used off-the-shelf components to build the system, and the total cost of key components is only about 20 US dollars. The total detection volume in our system was as low as 3 µL, which could significantly reduce the reagent cost and required sample volume. We further evaluated the system performance via the immunoagglutination assay to measure the concentration of C-reactive protein, a plasma protein with levels rising in response to inflammation. The results demonstrated that our system could measure the concentration of analytes with relatively high sensitivity and precision within four minutes, and has high potential to be applied for clinical diagnostic tests.
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Affiliation(s)
- Qiqi Sun
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
- Edan Instruments, Inc., Shenzhen 518067, China.
| | - Wei Zheng
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
| | - Chao Lin
- Edan Instruments, Inc., Shenzhen 518067, China.
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Celikbas E, Balaban S, Evran S, Coskunol H, Timur S. A Bottom-Up Approach for Developing Aptasensors for Abused Drugs: Biosensors in Forensics. BIOSENSORS-BASEL 2019; 9:bios9040118. [PMID: 31581533 PMCID: PMC6955935 DOI: 10.3390/bios9040118] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Revised: 09/27/2019] [Accepted: 09/30/2019] [Indexed: 02/07/2023]
Abstract
Aptamer-based point-of-care (POC) diagnostics platforms may be of substantial benefit in forensic analysis as they provide rapid, sensitive, user-friendly, and selective analysis tools for detection. Aptasensors have not yet been adapted commercially. However, the significance of the applications of aptasensors in the literature exceeded their potential. Herein, in this review, a bottom-up approach is followed to describe the aptasensor development and application procedure, starting from the synthesis of the corresponding aptamer sequence for the selected analyte to creating a smart surface for the sensitive detection of the molecule of interest. Optical and electrochemical biosensing platforms, which are designed with aptamers as recognition molecules, detecting abused drugs are critically reviewed, and existing and possible applications of different designs are discussed. Several potential disciplines in which aptamer-based biosensing technology can be of greatest value, including forensic drug analysis and biological evidence, are then highlighted to encourage researchers to focus on developing aptasensors in these specific areas.
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Affiliation(s)
- Eda Celikbas
- Department of Biochemistry, Institute of Natural and Applied Sciences, Ege University, 35100 Bornova, Izmir, Turkey;
- Correspondence: (E.A.); (S.E.); (S.T.)
| | - Simge Balaban
- Department of Biochemistry, Institute of Natural and Applied Sciences, Ege University, 35100 Bornova, Izmir, Turkey;
| | - Serap Evran
- Department of Biochemistry, Institute of Natural and Applied Sciences, Ege University, 35100 Bornova, Izmir, Turkey;
- Department of Biochemistry, Faculty of Science, Ege University, 35100 Bornova, Izmir, Turkey
- Correspondence: (E.A.); (S.E.); (S.T.)
| | - Hakan Coskunol
- Department of Mental Health and Diseases, Faculty of Medicine, Ege University, 35100 Bornova, Izmir, Turkey;
| | - Suna Timur
- Department of Biochemistry, Institute of Natural and Applied Sciences, Ege University, 35100 Bornova, Izmir, Turkey;
- Department of Biochemistry, Faculty of Science, Ege University, 35100 Bornova, Izmir, Turkey
- Central Research Testing and Analysis Laboratory Research and Application Center, Ege University, 35100 Bornova, Izmir, Turkey
- Correspondence: (E.A.); (S.E.); (S.T.)
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Zhao X, Chen LJ, Zhao KC, Liu YS, Liu JL, Yan XP. Autofluorescence-free chemo/biosensing in complex matrixes based on persistent luminescence nanoparticles. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2019.05.025] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Choi ES, Al Faruque H, Kim JH, Cho JH, Park KM, Kim E. Immunochromatographic assay to detect α-tubulin in urine for the diagnosis of kidney injury. J Clin Lab Anal 2019; 34:e23015. [PMID: 31423640 PMCID: PMC6977356 DOI: 10.1002/jcla.23015] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 08/01/2019] [Accepted: 08/05/2019] [Indexed: 12/17/2022] Open
Abstract
Backgrounds Shortening of primary cilia in kidney epithelial cells is associated with kidney injury and involved with the induced level of α‐tubulin in urine. Therefore, rapid detection and quantification of α‐tubulin in the urine samples could be used to the preliminary diagnosis of kidney injury. Methods Cellulose‐based nanobeads modified with α‐tubulin were used for the detection probe of competitive immunochromatographic (IC) assay. The concentration of α‐tubulin in the urine samples was determined by IC assay and compared with the amount determined by Western blotting analysis. Results The relationship between α‐tubulin concentration and the colorimetric intensity resulted from IC assay was determined by logistic regression, and the correlation coefficient (R2) was 0.9948. When compared to the amount determined by Western blotting analysis, there was a linear relationship between the α‐tubulin concentrations measured by the two methods and the R2 value was 0.823. Conclusions This method is simple, rapid, and adequately sensitive to detect α‐tubulin in patient urine samples, which could be used for the clinical diagnosis of kidney injury.
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Affiliation(s)
- Eun-Sook Choi
- Companion Diagnostics and Medical Technology Research Group, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Korea
| | - Hasan Al Faruque
- Companion Diagnostics and Medical Technology Research Group, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Korea
| | - Jung-Hee Kim
- Companion Diagnostics and Medical Technology Research Group, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Korea
| | - Jang-Hee Cho
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - Kwon Moo Park
- Department of Anatomy, School of Medicine, Kyungpook National University, Daegu, Korea
| | - Eunjoo Kim
- Companion Diagnostics and Medical Technology Research Group, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Korea
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Xiao M, Huang L, Dong X, Xie K, Shen H, Huang C, Xiao W, Jin M, Tang Y. Integration of a 3D-printed read-out platform with a quantum dot-based immunoassay for detection of the avian influenza A (H7N9) virus. Analyst 2019; 144:2594-2603. [PMID: 30830133 DOI: 10.1039/c8an02336k] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Outbreaks and potential epidemics of the highly pathogenic avian influenza virus pose serious threats to human health and the global economy. As such, its timely and accurate detection is critically important. In the present study, positive hybridoma cells (6B3) were obtained, which were used to secrete high-titer avian influenza virus (AIV) H7N9 monoclonal antibodies (H7N9 mAb). Based on these mAbs, quantum dot-based lateral flow immunochromatographic strips (QD-LFICS) were developed for AIV H7N9 detection. Under optimized conditions, results from a commercial fluorescent strip reader indicated that the limit of detection of QD-LFICS was 0.0268 HAU. To achieve rapid on-site testing, a mini 3D-printed read-out platform was fabricated to allow observation of QD-LFICS by the naked eye. More importantly, QD-LFICS were found to be practical and specific for the detection of actual samples compared with a real-time polymerase chain reaction.
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Affiliation(s)
- Meng Xiao
- Department of Bioengineering, Guangdong Province Engineering Research Center for antibody drug and immunoassay, Jinan University, Guangzhou 510632, PR China.
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Bheemavarapu LP, Shah MI, Joseph J, Sivaprakasam M. Multi-cartridge Fluorescence Reader for Quantitative Immunoassays. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2019; 2019:5447-5450. [PMID: 31947088 DOI: 10.1109/embc.2019.8857256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Lateral flow immunoassays (LFIA) play a significant role in point-of-care (POC) diagnostics, facilitating early diagnosis of medical conditions. With simpler infrastructure requirements, POC diagnostics can be easily adopted in remote areas as well as for end-user level monitoring. As part of the current work, we present a camera based multi-cartridge fluorescence reader. The proposed system can carry out simultaneous analysis of four LFIA test cartridges. It forms a simple, rugged system requiring minimal human intervention and the average time taken for tests is lower as compared to the available LFIA readers. The hardware architecture of the system along with the software algorithms utilized is described in this paper. To validate the system performance, tests were conducted using HbA1C samples. The designed system comprises of four test-slots accommodating four test cartridges in a single go. The correlation of the obtained results with reference sample concentrations was determined and system calibration equations were as well obtained. Repeatability across the slots in terms of % coefficient of variation was calculated and was found to be less than 6%. The obtained results along with challenges in the current system and future modifications are also discussed.
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Frohnmeyer E, Tuschel N, Sitz T, Hermann C, Dahl GT, Schulz F, Baeumner AJ, Fischer M. Aptamer lateral flow assays for rapid and sensitive detection of cholera toxin. Analyst 2019; 144:1840-1849. [PMID: 30681077 DOI: 10.1039/c8an01616j] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Aptamers are envisioned to serve as powerful synthetic substitutes to antibodies in a variety of bioanalytical assay formats. However, lateral flow assays (LFAs) remain dominated by antibody-based strategies. In this study, a LFA for the detection of cholera toxin as a model analyte is developed and optimized using a synthetic aptamer and a naturally occurring receptor as biorecognition elements and directly compared with solely aptamer and aptamer and antibody-based alternative approaches. The aptamer (CT916) recently selected by our group, GM1 receptors and an anti-cholera toxin antibody were evaluated. Relying solely on molecules that can easily be synthesized while aiming for high sensitivity, we applied a novel combination of capture aptamer and GM1 cell receptor-labeled liposomes for cholera toxin detection, achieving a limit of detection (LOD) of 2 ng ml-1 (3σ)/10 ng ml-1 (visual) in ∼15 min. To put our novel aptasensor into perspective, we developed a competitive lateral flow assay, exploiting the competition of cholera toxin in solution with immobilized cholera toxin for binding of aptamer-coated gold nanoparticles (AuNPs) (LOD = 51 ng ml-1 (3σ)/100 ng ml-1 (visual), assay time ∼10 min). As dual simultaneously binding aptamers were not available, we designed aptamer antibody pair-based lateral flow assays using aptamer-coated AuNPs which yielded a LOD of 5 ng ml-1 (by the 3σ rule)/10 ng ml-1 (visual) in a 10 min assay and an even better LOD of 0.6 ng ml-1 (3σ)/1 ng ml-1 (visual), with an ∼20 min total assay time. All set-ups are highly specific and provide an excellent alternative for cholera toxin detection in places where professional knowledge and sophisticated equipment are not readily available and cost efficient, simple, and rapid tests are needed, while the combination of GM1 cell receptor-labeled liposomes and aptamers is clearly the most promising.
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Affiliation(s)
- Esther Frohnmeyer
- Hamburg School of Food Science, Institute of Food Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany.
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Abstract
Cell phones show considerable promise for point-of-care (POC) diagnostic procedures because they are accessible, connected, and computationally powerful. Cell phone image processing methods are being developed for the detection and quantification of a wide range of targets, employing methods from microscopy to fluorescence techniques. However, most of the lab-based biological and biochemical assays still lack a robust and repeatable cell phone analogue. Existing solutions require external smartphone hardware to obtain quantitative results, imposing a design tradeoff between accessibility and accuracy. Here, we develop a cell phone imaging algorithm that enables analysis of assays that would typically be evaluated via spectroscopy. The developed technique uses the saturation parameter of hue-saturation-value color space to enable POC diagnosis. Through the analysis of over 10 000 images, we show that the saturation method consistently outperforms existing algorithms under a wide range of operating field conditions. The performance improvement is also proven analytically via the mathematic relationship between the saturation method and existing techniques. The method presented here is a step forward towards the development of POC diagnostics by reducing the required equipment, improving the limit of detection (LOD), and increasing the precision of quantitative results.
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Affiliation(s)
- Benjamin Coleman
- Asghar-Lab, Micro and Nanotechnology in Medicine, College of Engineering and Computer Science, Boca Raton, FL 33431, USA.
| | - Chad Coarsey
- Department of Computer & Electrical Engineering and Computer Science, Florida Atlantic University, Boca Raton, FL 33431, USA
| | - Waseem Asghar
- Asghar-Lab, Micro and Nanotechnology in Medicine, College of Engineering and Computer Science, Boca Raton, FL 33431, USA. and Department of Computer & Electrical Engineering and Computer Science, Florida Atlantic University, Boca Raton, FL 33431, USA and Department of Biological Sciences, Florida Atlantic University, Boca Raton, FL 33431, USA
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Lim WY, Thevarajah TM, Goh BT, Khor SM. Paper microfluidic device for early diagnosis and prognosis of acute myocardial infarction via quantitative multiplex cardiac biomarker detection. Biosens Bioelectron 2019; 128:176-185. [DOI: 10.1016/j.bios.2018.12.049] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 12/11/2018] [Accepted: 12/28/2018] [Indexed: 12/11/2022]
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Ghosh S, Ahn CH. Lyophilization of chemiluminescent substrate reagents for high-sensitive microchannel-based lateral flow assay (MLFA) in point-of-care (POC) diagnostic system. Analyst 2019; 144:2109-2119. [DOI: 10.1039/c8an01899e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new method towards successful lyophilization and reconstitution of chemiluminescent substrate while restoring the substrate functionality is reported in this work.
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Affiliation(s)
- Sthitodhi Ghosh
- Department of Electrical Engineering and Computer Science
- Microsystems and BioMEMS Laboratory
- University of Cincinnati
- USA
| | - Chong H. Ahn
- Department of Electrical Engineering and Computer Science
- Microsystems and BioMEMS Laboratory
- University of Cincinnati
- USA
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Xu X, Wang X, Hu J, Gong Y, Wang L, Zhou W, Li X, Xu F. A smartphone-based on-site nucleic acid testing platform at point-of-care settings. Electrophoresis 2018; 40:914-921. [PMID: 30511768 DOI: 10.1002/elps.201800449] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Revised: 11/18/2018] [Accepted: 11/20/2018] [Indexed: 11/07/2022]
Abstract
We developed a smartphone-based on-site nucleic acid testing (NAT) platform that can image and analyze lateral flow nucleic acid assays at point-of-care settings. An inexpensive add-on was devised to run lateral flow assays while providing homogeneous ambient light for imaging. In addition, an Android app with a user-friendly interface was developed for the result analysis and management. Linear color calibration is implemented inside the app to minimize the colorimetric reaction difference between smartphones. A relationship function between nucleic acid concentration and colorimetric reaction was established and evaluated by leave-one-out cross validation. The predicted concentration and true concentration showed a good agreement with an R-squared value of 0.96. This smartphone-based NAT platform can be used to diagnose infectious diseases and monitor disease progression, and assess treatment efficacy, especially for resource-limited settings.
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Affiliation(s)
- Xiayu Xu
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Shaanxi, P. R. China
- Bioinspired Engineering & Biomechanics Center (BEBC), Xi'an Jiaotong University, Shaanxi, P. R. China
| | - Xuemin Wang
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Shaanxi, P. R. China
- Bioinspired Engineering & Biomechanics Center (BEBC), Xi'an Jiaotong University, Shaanxi, P. R. China
| | - Jie Hu
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Shaanxi, P. R. China
- Bioinspired Engineering & Biomechanics Center (BEBC), Xi'an Jiaotong University, Shaanxi, P. R. China
| | - Yang Gong
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Shaanxi, P. R. China
- Bioinspired Engineering & Biomechanics Center (BEBC), Xi'an Jiaotong University, Shaanxi, P. R. China
| | - Lin Wang
- College of medicine, Xi'an International University, Shaanxi, P. R. China
| | - Wan Zhou
- Department of Chemistry and Biochemistry, Border Biomedical Research Center, & Biomedical Engineering (BME), University of Texas at El Paso, TX, USA
| | - XiuJun Li
- Department of Chemistry and Biochemistry, Border Biomedical Research Center, & Biomedical Engineering (BME), University of Texas at El Paso, TX, USA
| | - Feng Xu
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Shaanxi, P. R. China
- Bioinspired Engineering & Biomechanics Center (BEBC), Xi'an Jiaotong University, Shaanxi, P. R. China
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Abstract
Hormones produced by glands in the endocrine system and neurotransmitters produced by the nervous system control many bodily functions. The concentrations of these molecules in the body are an indication of its state, hence the use of the term biomarker. Excess concentrations of biomarkers, such as cortisol, serotonin, epinephrine, and dopamine, are released by the body in response to a variety of conditions, for example, emotional state (euphoria, stress) and disease. The development of simple, low-cost modalities for point-of-use (PoU) measurements of biomarkers levels in various bodily fluids (blood, urine, sweat, saliva) as opposed to conventional hospital or lab settings is receiving increasing attention. This paper starts with a review of the basic properties of 12 primary stress-induced biomarkers: origin in the body (i.e., if they are produced as hormones, neurotransmitters, or both), chemical composition, molecular weight (small/medium size molecules and polymers, ranging from ∼100 Da to ∼100 kDa), and hydro- or lipophilic nature. Next is presented a detailed review of the published literature regarding the concentration of these biomarkers found in several bodily fluids that can serve as the medium for determination of the condition of the subject: blood, urine, saliva, sweat, and, to a lesser degree, interstitial tissue fluid. The concentration of various biomarkers in most fluids covers a range of 5-6 orders of magnitude, from hundreds of nanograms per milliliter (∼1 μM) down to a few picograms per milliliter (sub-1 pM). Mechanisms and materials for point-of-use biomarker sensors are summarized, and key properties are reviewed. Next, selected methods for detecting these biomarkers are reviewed, including antibody- and aptamer-based colorimetric assays and electrochemical and optical detection. Illustrative examples from the literature are discussed for each key sensor approach. Finally, the review outlines key challenges of the field and provides a look ahead to future prospects.
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Affiliation(s)
- Andrew J. Steckl
- Nanoelectronics Laboratory, University of Cincinnati, Cincinnati, Ohio 45221-0030, United States
| | - Prajokta Ray
- Nanoelectronics Laboratory, University of Cincinnati, Cincinnati, Ohio 45221-0030, United States
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Aydindogan E, Guler Celik E, Timur S. Paper-Based Analytical Methods for Smartphone Sensing with Functional Nanoparticles: Bridges from Smart Surfaces to Global Health. Anal Chem 2018; 90:12325-12333. [PMID: 30222319 DOI: 10.1021/acs.analchem.8b03120] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In this Feature, the most recent developments as well as "pros and cons" in smartphone sensing, which have been developed using various functional nanoparticles in paper-based sensing systems, will be discussed. Additionally, smart phone sensing and POC combination as a potential tool that opens a gate for knowledge flow "from lab scale data to public use" will be evaluated.
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Affiliation(s)
- Eda Aydindogan
- Ege University , Faculty of Science, Biochemistry Department , 35100 , Bornova, Izmir , Turkey
| | - Emine Guler Celik
- Ege University , Faculty of Science, Biochemistry Department , 35100 , Bornova, Izmir , Turkey
| | - Suna Timur
- Ege University , Faculty of Science, Biochemistry Department , 35100 , Bornova, Izmir , Turkey.,Central Research Testing and Analysis Laboratory Research and Application Center , Ege University , 35100 , Bornova, Izmir , Turkey
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Rapid and simple detection of Tamiflu-resistant influenza virus: Development of oseltamivir derivative-based lateral flow biosensor for point-of-care (POC) diagnostics. Sci Rep 2018; 8:12999. [PMID: 30158601 PMCID: PMC6115449 DOI: 10.1038/s41598-018-31311-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 08/16/2018] [Indexed: 01/16/2023] Open
Abstract
We have developed a novel oseltamivir derivative (oseltamivir hexylthiol; OHT) that exhibits a higher binding affinity for Tamiflu-resistant virus (Tamiflu resistance) than for the wild-type virus (Tamiflu-susceptible virus; WT) as an antibody. First, OHT-modified gold nanoparticles (OHT-GNPs) are used in a simple colorimetric assay as nanoprobes for the Tamiflu-resistant virus. In the presence of Tamiflu-resistant virus, they show a colorimetric change from deep red to purple because of the OHT-GNP aggregation driven by strong interactions between OHT and neuraminidase (NA) on the surface of the Tamiflu-resistance. Moreover, the color gradually turns purple as the concentration of the Tamiflu-resistant virus increases, allowing the determination of the presence of the virus with the naked eye. Furthermore, an OHT-based lateral flow assay (LFA) has been developed as a rapid and easy detection device for Tamiflu resistance. It shows detection specificity for various virus concentrations of Tamiflu-resistant virus even for the mixture of WT and Tamiflu-resistant viruses, where the limit of detection (LOD) is 5 × 102 ~ 103 PFU per test (=1 × 104 PFU/mL). It has been confirmed that this platform can provide accurate information on whether a virus exhibits Tamiflu resistance, thus supporting the selection of appropriate treatments using point-of-care (POC) diagnostics.
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Shah KG, Singh V, Kauffman PC, Abe K, Yager P. Mobile Phone Ratiometric Imaging Enables Highly Sensitive Fluorescence Lateral Flow Immunoassays without External Optical Filters. Anal Chem 2018; 90:6967-6974. [PMID: 29715012 DOI: 10.1021/acs.analchem.8b01241] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Paper-based diagnostic tests based on the lateral flow immunoassay concept promise low-cost, point-of-care detection of infectious diseases, but such assays suffer from poor limits of detection. One factor that contributes to poor analytical performance is a reliance on low-contrast chromophoric optical labels such as gold nanoparticles. Previous attempts to improve the sensitivity of paper-based diagnostics include replacing chromophoric labels with enzymes, fluorophores, or phosphors at the expense of increased fluidic complexity or the need for device readers with costly optoelectronics. Several groups, including our own, have proposed mobile phones as suitable point-of-care readers due to their low cost, ease of use, and ubiquity. However, extant mobile phone fluorescence readers require costly optical filters and were typically validated with only one camera sensor module, which is inappropriate for potential point-of-care use. In response, we propose to couple low-cost ultraviolet light-emitting diodes with long Stokes-shift quantum dots to enable ratiometric mobile phone fluorescence measurements without optical filters. Ratiometric imaging with unmodified smartphone cameras improves the contrast and attenuates the impact of excitation intensity variability by 15×. Practical application was shown with a lateral flow immunoassay for influenza A with nucleoproteins spiked into simulated nasal matrix. Limits of detection of 1.5 and 2.6 fmol were attained on two mobile phones, which are comparable to a gel imager (1.9 fmol), 10× better than imaging gold nanoparticles on a scanner (18 fmol), and >2 orders of magnitude better than gold nanoparticle-labeled assays imaged with mobile phones. Use of the proposed filter-free mobile phone imaging scheme is a first step toward enabling a new generation of highly sensitive, point-of-care fluorescence assays.
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Affiliation(s)
- Kamal G Shah
- Department of Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - Vidhi Singh
- Department of Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - Peter C Kauffman
- Department of Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - Koji Abe
- Department of Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - Paul Yager
- Department of Bioengineering , University of Washington , Seattle , Washington 98195 , United States
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Obahiagbon U, Smith JT, Zhu M, Katchman BA, Arafa H, Anderson KS, Blain Christen JM. A compact, low-cost, quantitative and multiplexed fluorescence detection platform for point-of-care applications. Biosens Bioelectron 2018; 117:153-160. [PMID: 29894852 DOI: 10.1016/j.bios.2018.04.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2017] [Revised: 03/23/2018] [Accepted: 04/02/2018] [Indexed: 11/29/2022]
Abstract
An effective method of combating infectious diseases is the deployment of hand-held devices at the point-of-care (POC) for screening or self-monitoring applications. There is a need for very sensitive, low-cost and quantitative diagnostic devices. In this study, we present a low-cost, multiplexed fluorescence detection platform that has a high sensitivity and wide dynamic range. Our system features inexpensive 3 × 3 mm interference filters with a high stopband rejection, sharp transition edges, and greater than 90% transmission in the passband. In addition to the filters, we improve signal-to-noise ratio by leveraging time for accuracy using a charge-integration-based readout. The fluorescence sensing platform provides a sensitivity to photon flux of ∼1×104photons/mm2sec and has the potential for 2-3 orders of magnitude improvement in sensitivity over standard colorimetric detection that uses colored latex microspheres. We also detail the design, development, and characterization of our low-cost fluorescence detection platform and demonstrate 100% and 97.96% reduction in crosstalk probability and filter cost, respectively. This is achieved by reducing filter dimensions and ensuring appropriate channel isolation in a 2 × 2 array configuration. Practical considerations with low-cost interference filter system design, analysis, and system performance are also discussed. The performance of our platform is compared to that of a standard laboratory array scanner. We also demonstrate the detection of antibodies to human papillomavirus (HPV16) E7 protein, as a potential biomarker for early cervical cancer detection in human plasma.
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Affiliation(s)
- Uwadiae Obahiagbon
- School of Electrical, Computer and Energy Engineering at Arizona State University, Suite 334, Goldwater Center, Tempe, AZ 85287, USA
| | - Joseph T Smith
- School of Electrical, Computer and Energy Engineering at Arizona State University, Suite 334, Goldwater Center, Tempe, AZ 85287, USA; Center for Personalized Diagnostics, Biodesign Institute at Arizona State University, Tempe, AZ 85281, USA
| | - Meilin Zhu
- Center for Personalized Diagnostics, Biodesign Institute at Arizona State University, Tempe, AZ 85281, USA
| | - Benjamin A Katchman
- Center for Personalized Diagnostics, Biodesign Institute at Arizona State University, Tempe, AZ 85281, USA
| | - Hany Arafa
- School of Electrical, Computer and Energy Engineering at Arizona State University, Suite 334, Goldwater Center, Tempe, AZ 85287, USA
| | - Karen S Anderson
- Center for Personalized Diagnostics, Biodesign Institute at Arizona State University, Tempe, AZ 85281, USA
| | - Jennifer M Blain Christen
- School of Electrical, Computer and Energy Engineering at Arizona State University, Suite 334, Goldwater Center, Tempe, AZ 85287, USA.
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43
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Chowdhury KB, Joseph J, Sivaprakasam M. Image based quantitative reader for Lateral flow immunofluorescence assay. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2018; 2015:1223-6. [PMID: 26736487 DOI: 10.1109/embc.2015.7318587] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Fluorescence Lateral flow immunoassays (LFIA) have wide range of applications in point-of-care testing (POCT). An integrated, motion-free, accurate, reliable reader that performs automated quantitative analysis of LFIA is essential for POCT diagnosis. We demonstrate an image based quantitative method to read the lateral flow immunofluorescence test strips. The developed reader uses line laser diode module to illuminate the LFIA test strip having fluorescent dye. Fluorescence light coming from the region of interest (ROI) of the LFIA test strip was filtered using an emission filter and imaged using a camera following which images were processed in computer. A dedicated control program was developed that automated the entire process including illumination of the test strip using laser diode, capturing the ROI of the test strip, processing and analyzing the images and displaying of results. Reproducibility of the reader has been evaluated using few reference cartridges and HbA1c (Glycated haemoglobin) test cartridges. The proposed system can be upgraded to a compact reader for widespread testing of LFIA test strips.
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44
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Salminen T, Knuutila A, Barkoff AM, Mertsola J, He Q. A rapid lateral flow immunoassay for serological diagnosis of pertussis. Vaccine 2018; 36:1429-1434. [DOI: 10.1016/j.vaccine.2018.01.064] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 01/24/2018] [Accepted: 01/25/2018] [Indexed: 02/06/2023]
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45
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Kim J, Poling-Skutvik R, Trabuco JRC, Kourentzi K, Willson RC, Conrad JC. Orientational binding modes of reporters in a viral-nanoparticle lateral flow assay. Analyst 2018; 142:55-64. [PMID: 27704069 DOI: 10.1039/c6an00567e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Using microscopy and image analysis, we characterize binding of filamentous viral nanoparticles to a fibrous affinity matrix as models for reporter capture in a lateral flow assay (LFA). M13 bacteriophage (M13) displaying an in vivo-biotinylated peptide (AviTag) genetically fused to the M13 tail protein p3 are functionalized with fluorescent labels. We functionalize glass fiber LFA membranes with antibodies to M13, which primarily capture M13 on the major p8 coat proteins, or with avidin, which captures M13 at the biotin-functionalized tail, and compare orientational modes of reporter capture for the side- versus tip-binding recognition interactions. The number of captured M13 is greater for side-binding than for tip-binding, as expected from the number of recognition groups. Whereas two-thirds of side-bound M13 captured by an anti-M13 antibody bind immediately after colliding with the membrane, tip-bound M13 prominently exhibit three additional orientational modes that require M13 to reorient to enable binding. These results are consistent with the idea that the elongated M13 shape couples with the complex flow field in an open and disordered fibrous LFA membrane to enhance capture.
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Affiliation(s)
- Jinsu Kim
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77204, USA.
| | - Ryan Poling-Skutvik
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77204, USA.
| | - João R C Trabuco
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77204, USA.
| | - Katerina Kourentzi
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77204, USA.
| | - Richard C Willson
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77204, USA. and Department of Biology & Biochemistry, University of Houston, Houston, Texas 77004, USA and Centro de Biotecnología FEMSA, Tecnológico de Monterrey, Monterrey, Nuevo León, Mexico
| | - Jacinta C Conrad
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77204, USA.
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46
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Geldert A, Kenry, Lim CT. Paper-based MoS 2 nanosheet-mediated FRET aptasensor for rapid malaria diagnosis. Sci Rep 2017; 7:17510. [PMID: 29235484 PMCID: PMC5727500 DOI: 10.1038/s41598-017-17616-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Accepted: 11/28/2017] [Indexed: 11/09/2022] Open
Abstract
There has been growing interest in the development of paper-based biosensors because their simplicity and low cost are attractive for point-of-care diagnosis, especially in low-resource areas. However, only a limited range of paper materials - primarily chromatography papers - have been incorporated into diagnostics thus far. Here, we investigate the performance of different types of paper in order to develop an aptamer- and MoS2 nanosheet-based sensor relying on fluorescence resonance energy transfer (FRET) to signal the presence of a target protein. An aptamer which binds to a malarial biomarker, Plasmodium lactate dehydrogenase (pLDH), is chosen for this study, as point-of-care diagnostics would be especially advantageous in low-resource areas, such as those where malaria is prevalent. We observe that of all papers tested, a measurable and specific fluorescence recovery can only be produced on the sensor created with printer paper, while no significant fluorescence recovery is generated on sensors made from other types of paper, including chromatography, lens, and filter papers. Therefore, our findings demonstrate the importance of careful material selection for the development of a paper-based diagnostic test, and suggest that commercially-available products such as printer paper may serve as viable materials to develop cost-effective and simple diagnostics.
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Affiliation(s)
- Alisha Geldert
- Department of Biomedical Engineering, National University of Singapore, Singapore, 117576, Singapore
| | - Kenry
- Department of Biomedical Engineering, National University of Singapore, Singapore, 117576, Singapore.,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, 117456, Singapore.,Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, 117543, Singapore
| | - Chwee Teck Lim
- Department of Biomedical Engineering, National University of Singapore, Singapore, 117576, Singapore. .,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, 117456, Singapore. .,Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, 117543, Singapore. .,Mechanobiology Institute, National University of Singapore, Singapore, 117411, Singapore.
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Shah KG, Yager P. Wavelengths and Lifetimes of Paper Autofluorescence: A Simple Substrate Screening Process to Enhance the Sensitivity of Fluorescence-Based Assays in Paper. Anal Chem 2017; 89:12023-12029. [PMID: 29048155 DOI: 10.1021/acs.analchem.7b02424] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Porous media made of nitrocellulose and glass fiber are common "paper" substrates for lateral flow assays, microfluidic paper analytical devices and other point-of-care diagnostic assays. Such assays commonly use optical labels such as gold nanoparticles, latex beads, or fluorescent nanoparticles to visualize the presence of analytes. Fluorescent labels are commonly used in bioassays to enhance sensitivity, but autoluminescence of the paper substrate worsens signal-to-noise ratios of fluorescence-based assays. To date, there exists no systematic investigation of autoluminescence wavelengths or lifetimes of porous membranes used in lateral flow assays. In response, we quantified the autoluminescence of commonly used porous materials across the visible spectrum via excitation-emission spectroscopy and time-resolved fluorescence spectroscopy, and demonstrate that autoluminescence is solely due to autofluorescence with lifetimes of about 5 ns in the visible spectrum. Counterintuitively, we found that spectroscopy alone does not provide sufficient information to select candidate paper substrates for fluorophore-labeled assays. Therefore, we developed a simple quantitative framework to select a low-fluorescence substrate that minimizes both the overlap of paper and fluorophore emission spectra and the fluorescence intensity on an imaging system of interest (such as a gel imager). Use of this framework was shown to lower the limit of detection of an influenza A nucleoprotein immunoassay by over 50%. The tools developed in this manuscript enable assay developers to screen appropriate, low-fluorescence porous substrates and enhance the sensitivity of membrane-based fluorescence assays.
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Affiliation(s)
- Kamal G Shah
- Department of Bioengineering, University of Washington , Box 355061, Seattle, Washington 98195, United States
| | - Paul Yager
- Department of Bioengineering, University of Washington , Box 355061, Seattle, Washington 98195, United States
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48
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Chowdhury KB, Joseph J, Vasan JK, Sivaprakasam M. ImQuant - An image based fluorescence reader for quantitative lateral flow immunoassays. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2017; 2016:5152-5155. [PMID: 28325018 DOI: 10.1109/embc.2016.7591887] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Fluorescence immunoassays (FIA) have strong potential in enabling rapid quantitative immunological testing at point of care. Existing state of the art instruments employ laser scanning of FIA test kits, which require the use of electromechanical systems, making the instrument bulky, heavy and less reliable in the long term. There is a growing need for an extremely compact and reliable, motion-free, automated reader for accurate quantification of immunoassays. Here, we present ImQuant, an image based FIA reader with integrated monochromatic excitation source, optical filtering and real time image capture, assisted with an intuitive graphical user interface. A 12bit dynamic range RAW ouput CMOS camera with 1/3" sensor format and a sharp cut off wideband filter were utilized to ensure improved accuracy. A laboratory prototype was constructed and tested using a set of stable reference cartridges that provided repeatable fluorescent lines. The ImQuant could capture the lines and measure area ratios with coefficient of variation (CV) less than 2%. Further, tests with blood samples on Quanti® HbA1C test kits also demonstrated good repeatability with CV<;2%. The ImQuant is a novel platform of motion-free fluorescent scanning of FIA immunoassays and is being used for developing a variety of test kits and instruments.
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49
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Mobile phone-based biosensing: An emerging “diagnostic and communication” technology. Biosens Bioelectron 2017; 92:549-562. [DOI: 10.1016/j.bios.2016.10.062] [Citation(s) in RCA: 178] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 10/04/2016] [Accepted: 10/23/2016] [Indexed: 01/02/2023]
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50
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Paterson AS, Raja B, Mandadi V, Townsend B, Lee M, Buell A, Vu B, Brgoch J, Willson RC. A low-cost smartphone-based platform for highly sensitive point-of-care testing with persistent luminescent phosphors. LAB ON A CHIP 2017; 17:1051-1059. [PMID: 28154873 PMCID: PMC5476460 DOI: 10.1039/c6lc01167e] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Through their computational power and connectivity, smartphones are poised to rapidly expand telemedicine and transform healthcare by enabling better personal health monitoring and rapid diagnostics. Recently, a variety of platforms have been developed to enable smartphone-based point-of-care testing using imaging-based readout with the smartphone camera as the detector. Fluorescent reporters have been shown to improve the sensitivity of assays over colorimetric labels, but fluorescence readout necessitates incorporating optical hardware into the detection system, adding to the cost and complexity of the device. Here we present a simple, low-cost smartphone-based detection platform for highly sensitive luminescence imaging readout of point-of-care tests run with persistent luminescent phosphors as reporters. The extremely bright and long-lived emission of persistent phosphors allows sensitive analyte detection with a smartphone by a facile time-gated imaging strategy. Phosphors are first briefly excited with the phone's camera flash, followed by switching off the flash, and subsequent imaging of phosphor luminescence with the camera. Using this approach, we demonstrate detection of human chorionic gonadotropin using a lateral flow assay and the smartphone platform with strontium aluminate nanoparticles as reporters, giving a detection limit of ≈45 pg mL-1 (1.2 pM) in buffer. Time-gated imaging on a smartphone can be readily adapted for sensitive and potentially quantitative testing using other point-of-care formats, and is workable with a variety of persistent luminescent materials.
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Affiliation(s)
- Andrew S Paterson
- Department of Chemical & Biomolecular Engineering, University of Houston, USA. and Luminostics, Inc., Houston, TX, USA
| | - Balakrishnan Raja
- Department of Chemical & Biomolecular Engineering, University of Houston, USA. and Luminostics, Inc., Houston, TX, USA
| | - Vinay Mandadi
- Luminostics, Inc., Houston, TX, USA and Department of Mechanical Engineering, University of Houston, USA
| | | | | | - Alex Buell
- Department of Computer Science, University of Houston, USA
| | - Binh Vu
- Department of Chemical & Biomolecular Engineering, University of Houston, USA.
| | | | - Richard C Willson
- Department of Chemical & Biomolecular Engineering, University of Houston, USA. and Department of Biology & Biochemistry, University of Houston, USA and Centro de Biotecnología FEMSA, Tecnológico de Monterrey, Campus Monterrey, Mexico
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