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Mesas Gómez M, Julián E, Armengou L, Pividori MI. Evaluating smartphone-based optical readouts for immunoassays in human and veterinary healthcare: A comparative study. Talanta 2024; 275:126106. [PMID: 38648687 DOI: 10.1016/j.talanta.2024.126106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2023] [Revised: 04/08/2024] [Accepted: 04/12/2024] [Indexed: 04/25/2024]
Abstract
Recent advances have significantly enhanced the use of smartphone devices for medical diagnostics. This study uses high-resolution cameras in mobile devices to capture and process bioassay images, enabling the quantification of diverse biomarkers across a range of diagnostic tests conducted on 96-well microplates. The study evaluates the effectiveness of this technology through protein quantification techniques and immunoassays that generate colorimetric responses at specific wavelengths. It includes the assessment of bicinchoninic acid and Bradford protein quantification methods, alongside a conventional immunoassay for detecting mare antibodies in colostrum to monitor foal immunodeficiencies. Further application involves the readout of magneto-actuated immunoassays aimed at quantifying bacteria. The results obtained from benchtop spectrophotometry at 595, 562, and 450 nm are compared with those acquired using a smartphone, which identified color intensities in shades of blue, purple, and yellow. This comparison yields promising correlations for the samples tested, suggesting a high degree of accuracy in the smartphone capability to analyze bioassay outcomes. The analysis via smartphone is facilitated by a specific app, which processes the images captured by the phone camera to quantify color intensities corresponding to different biomarker concentrations. Detection limits of 12.3 and 22.8 μg mL-1 for the bicinchoninic acid assay and 36.7 and 45.4 μg mL-1 for the Bradford are obtained for protein quantification using the spectrophotometer and the smartphone app, respectively. For mare's antibodies in colostrum, the values are 1.14 and 1.72 ng mL-1, while the detection of E. coli is performed at 2.0 x 104 and 2.9 × 104 CFU mL-1, respectively. This approach offers further advantages, including wide availability, cost-effectiveness, portability, compared to traditional and expensive benchtop instruments.
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Affiliation(s)
- Melania Mesas Gómez
- Grup de Sensors i Biosensors, Departament de Química, Universitat Autònoma de Barcelona, Bellaterra, Spain; Biosensing and Bioanalysis Group, Institute of Biotechnology and Biomedicine, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Esther Julián
- Departament de Genètica i de Microbiologia, Facultat de Biociències, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Lara Armengou
- Fundació Hospital Clínic Veterinari, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Maria Isabel Pividori
- Grup de Sensors i Biosensors, Departament de Química, Universitat Autònoma de Barcelona, Bellaterra, Spain; Biosensing and Bioanalysis Group, Institute of Biotechnology and Biomedicine, Universitat Autònoma de Barcelona, Bellaterra, Spain.
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Sen A, Masetty M, Weerakoon S, Morris C, Yadav JS, Apewokin S, Trannguyen J, Broom M, Priye A. Paper-based loop-mediated isothermal amplification and CRISPR integrated platform for on-site nucleic acid testing of pathogens. Biosens Bioelectron 2024; 257:116292. [PMID: 38653014 DOI: 10.1016/j.bios.2024.116292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 04/02/2024] [Accepted: 04/09/2024] [Indexed: 04/25/2024]
Abstract
We report the development and initial validation of a paper-based nucleic acid testing platform that integrates Loop-mediated isothermal amplification (LAMP) with clustered regularly interspaced short palindromic repeats (CRISPR) technology, referred to as PLACID (Paper-based LAMP-CRISPR Integrated Diagnostics). LAMP eliminates the need for thermal cycling, resulting in simplified instrumentation, and the CRISPR-associated protein (Cas 12a) system eliminates false positive signals from LAMP products, resulting in highly selective and sensitive assays. We optimized the assay to perform both amplification and detection entirely on paper, eliminating the need for complex fluid handling steps and lateral flow assay transfers. Additionally, we engineered a smartphone-operated system that includes a low-powered, non-contact IR heating chamber to actuate paper-based LAMP and CRISPR reactions and enable the detection of fluorescent signals from the paper. The platform demonstrates high specificity and sensitivity in detecting nucleic acid targets with a limit of detection of 50 copies/μL. We integrate an equipment-free sample preparation separation technology designed to streamline the preparation of crude samples prior to nucleic acid testing. The practical utility of our platform is demonstrated by the successful detection of spiked SARS-CoV-2 RNA fragments in saliva, E. Coli in soil, and pathogenic E. Coli in clinically fecal samples of infected patients. Furthermore, we demonstrate that the paper-based LAMP CRISPR chips employed in our assays possess a shelf life of several weeks, establishing them as viable candidates for on-site diagnostics.
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Affiliation(s)
- Anindita Sen
- DNAiTECH Ltd, Marlborough Research Center, 2650 State Highway 1, Grovetown, Blenheim, Marlborough, 7202, New Zealand
| | - Manaswini Masetty
- Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH, 45221, USA
| | - Sasanka Weerakoon
- Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH, 45221, USA
| | - Calum Morris
- DNAiTECH Ltd, Marlborough Research Center, 2650 State Highway 1, Grovetown, Blenheim, Marlborough, 7202, New Zealand
| | - Jagjit S Yadav
- Department of Environmental & Public Health Sciences, College of Medicine, University of Cincinnati, Cincinnati, OH, 45221, USA
| | - Senu Apewokin
- Division of Infectious Diseases, College of Medicine, University of Cincinnati, Cincinnati, OH, 45221, USA
| | - Jennifer Trannguyen
- Division of Infectious Diseases, College of Medicine, University of Cincinnati, Cincinnati, OH, 45221, USA
| | - Murray Broom
- DNAiTECH Ltd, Marlborough Research Center, 2650 State Highway 1, Grovetown, Blenheim, Marlborough, 7202, New Zealand.
| | - Aashish Priye
- Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH, 45221, USA; Digital Futures, University of Cincinnati, Cincinnati, OH, 45221, USA.
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Ganguli A, Ornob A, Yu H, Damhorst GL, Chen W, Sun F, Bhuiya A, Cunningham BT, Bashir R. Hands-free smartphone-based diagnostics for simultaneous detection of Zika, Chikungunya, and Dengue at point-of-care. Biomed Microdevices 2017; 19:73. [PMID: 28831630 DOI: 10.1007/s10544-017-0209-9] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Infectious diseases remain the world's top contributors to death and disability, and, with recent outbreaks of Zika virus infections there has been an urgency for simple, sensitive and easily translatable point-of-care tests. Here we demonstrate a novel point-of-care platform to diagnose infectious diseases from whole blood samples. A microfluidic platform performs minimal sample processing in a user-friendly diagnostics card followed by real-time reverse-transcription loop-mediated isothermal amplification (RT-LAMP) on the same card with pre-dried primers specific to viral targets. Our point-of-care platform uses a commercial smartphone to acquire real-time images of the amplification reaction and displays a visual read-out of the assay. We apply this system to detect closely related Zika, Dengue (types 1 and 3) and Chikungunya virus infections from whole blood on the same pre-printed chip with high specificity and clinically relevant sensitivity. Limit of detection of 1.56e5 PFU/mL of Zika virus from whole blood was achieved through our platform. With the ability to quantitate the target nucleic acid, this platform can also perform point-of-care patient surveillance for pathogen load or select biomarkers in whole blood.
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Affiliation(s)
- A Ganguli
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA.,Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, USA
| | - A Ornob
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA.,Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, USA
| | - H Yu
- Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, USA.,Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA
| | - G L Damhorst
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA.,Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, USA.,College of Medicine at Urbana-Champaign, University of Illinois, Champaign, IL, USA
| | - W Chen
- Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, USA.,Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA
| | - F Sun
- Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, USA.,Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA
| | - A Bhuiya
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA.,Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, USA
| | - B T Cunningham
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA. .,Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, USA. .,Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA.
| | - R Bashir
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA. .,Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, USA. .,Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA. .,Carle Illinois College of Medicine, Urbana, IL, USA.
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