|
1
|
Li Y, Kong Y, Hu Y, Li Y, Asrosa R, Zhang W, Deka Boruah B, Yetisen AK, Davenport A, Lee TC, Li B. A paper-based dual functional biosensor for safe and user-friendly point-of-care urine analysis. LAB ON A CHIP 2024; 24:2454-2467. [PMID: 38644805 PMCID: PMC11060138 DOI: 10.1039/d4lc00163j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Accepted: 04/10/2024] [Indexed: 04/23/2024]
Abstract
Safe, accurate, and reliable analysis of urinary biomarkers is clinically important for early detection and monitoring of the progression of chronic kidney disease (CKD), as it has become one of the world's most prevalent non-communicable diseases. However, current technologies for measuring urinary biomarkers are either time-consuming and limited to well-equipped hospitals or lack the necessary sensitivity for quantitative analysis and post a health risk to frontline practitioners. Here we report a robust paper-based dual functional biosensor, which is integrated with the clinical urine sampling vial, for the simultaneous and quantitative analysis of pH and glucose in urine. The pH sensor was fabricated by electrochemically depositing IrOx onto a paper substrate using optimised parameters, which enabled an ultrahigh sensitivity of 71.58 mV pH-1. Glucose oxidase (GOx) was used in combination with an electrochemically deposited Prussian blue layer for the detection of glucose, and its performance was enhanced by gold nanoparticles (AuNPs), chitosan, and graphite composites, achieving a sensitivity of 1.5 μA mM-1. This dual function biosensor was validated using clinical urine samples, where a correlation coefficient of 0.96 for pH and 0.98 for glucose detection was achieved with commercial methods as references. More importantly, the urine sampling vial was kept sealed throughout the sample-to-result process, which minimised the health risk to frontline practitioners and simplified the diagnostic procedures. This diagnostic platform, therefore, holds high promise as a rapid, accurate, safe, and user-friendly point-of-care (POC) technology for the analysis of urinary biomarkers in frontline clinical settings.
Collapse
Affiliation(s)
- Yujia Li
- Institute for Materials Discovery, University College London, London, WC1E 7JE, UK.
- Department of Chemistry, University College London, London, WC1E 7JE, UK
| | - Yingqi Kong
- Institute for Materials Discovery, University College London, London, WC1E 7JE, UK.
- Department of Chemistry, University College London, London, WC1E 7JE, UK
| | - Yubing Hu
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Yixuan Li
- Institute for Materials Discovery, University College London, London, WC1E 7JE, UK.
- Department of Chemistry, University College London, London, WC1E 7JE, UK
| | - Rica Asrosa
- Institute for Materials Discovery, University College London, London, WC1E 7JE, UK.
- Department of Chemistry, University College London, London, WC1E 7JE, UK
- Department of Physics, Faculty of Mathematics and Natural Science, Universitas Sumatera Utara, Medan 20155, Sumatera Utara, Indonesia
| | - Wenyu Zhang
- Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK
| | - Buddha Deka Boruah
- Institute for Materials Discovery, University College London, London, WC1E 7JE, UK.
| | - Ali K Yetisen
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Andrew Davenport
- UCL Department of Renal Medicine, Royal Free Hospital, University College London, Rowland Hill Street, London, NW3 2PF, UK
| | - Tung-Chun Lee
- Institute for Materials Discovery, University College London, London, WC1E 7JE, UK.
| | - Bing Li
- Institute for Materials Discovery, University College London, London, WC1E 7JE, UK.
| |
Collapse
|
|
2
|
Abstract
Nowadays, we are assisting in the exceptional growth in research relating to the development of wearable devices for sweat analysis. Sweat is a biofluid that contains useful health information and allows a non-invasive, continuous and comfortable collection. For this reason, it is an excellent biofluid for the detection of different analytes. In this work, electrochemical sensors based on polyaniline thin films deposited on the flexible substrate polyethylene terephthalate coated with indium tin oxide were studied. Polyaniline thin films were abstained by the potentiostatic deposition technique, applying a potential of +2 V vs. SCE for 90 s. To improve the sensor performance, the electronic substrate was modified with reduced graphene oxide, obtained at a constant potential of −0.8 V vs. SCE for 200 s, and then polyaniline thin films were electrodeposited on top of the as-deposited substrate. All samples were characterized by XRD, SEM, EDS, static contact angle and FT-IR/ATR analysis to correlate the physical-chemical features with the performance of the sensors. The obtained electrodes were tested as pH sensors in the range from 2 to 8, showing good behavior, with a sensitivity of 62.3 mV/pH, very close to a Nernstian response, and a reproducibility of 3.8%. Interference tests, in the presence of competing ions, aimed to verify the selectivity, were also performed. Finally, a real sweat sample was collected, and the sweat pH was quantified with both the proposed sensor and a commercial pH meter, showing an excellent concordance.
Collapse
|