1. Paper biosensors for detecting elevated IL-6 levels in blood and respiratory samples from COVID-19 patients
- Author
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Marcio Borges, María Berman-Riu, Mercedes García-Gasalla, Enrique Barón, Alejandra Alba-Patiño, Giulia Santopolo, J. M. Ferrer, Steven M. Russell, Andreu Vaquer, María Aranda, Roberto de la Rica, Cristina Adrover-Jaume, María del Mar González del Campo, and Antonio Clemente
- Subjects
Coronavirus disease 2019 (COVID-19) ,Paper-based ,02 engineering and technology ,010402 general chemistry ,Systemic inflammation ,01 natural sciences ,Article ,Prognosis biomarker ,Wide dynamic range ,Materials Chemistry ,Medicine ,Electrical and Electronic Engineering ,Interleukin 6 ,Respiratory samples ,Instrumentation ,ComputingMethodologies_COMPUTERGRAPHICS ,Detection limit ,IL-6 ,biology ,SARS-CoV-2 ,business.industry ,Metals and Alloys ,COVID-19 ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,biology.protein ,Smartphone ,medicine.symptom ,0210 nano-technology ,business ,Biosensor ,Biomedical engineering - Abstract
Graphical abstract, Highlights • Detection of cytokine storm biomarkers with mobile biosensors. • Immunosensors are made solely of cellulose modified with antibody-decorated nanoparticles. • Turnaround time under 10 min. • Detection of biomarkers in respiratory samples allows monitoring local inflammation. • Compatible with decentralized health care schemes., Decentralizing COVID-19 care reduces contagions and affords a better use of hospital resources. We introduce biosensors aimed at detecting severe cases of COVID-19 in decentralized healthcare settings. They consist of a paper immunosensor interfaced with a smartphone. The immunosensors have been designed to generate intense colorimetric signals when the sample contains ultralow concentrations of IL-6, which has been proposed as a prognosis biomarker of COVID-19. This is achieved by combining a paper-based signal amplification mechanism with polymer-filled reservoirs for dispensing antibody-decorated nanoparticles and a bespoken app for color quantification. With this design we achieved a low limit of detection (LOD) of 10−3 pg mL-1 and semi-quantitative measurements in a wide dynamic range between 10−3 and 102 pg mL-1 in PBS. The assay time is under 10 min. The low LOD allowed us to dilute blood samples and detect IL-6 with an LOD of 1.3 pg mL-1 and a dynamic range up to 102 pg mL-1. Following this protocol, we were able to stratify COVID-19 patients according to different blood levels of IL-6. We also report on the detection of IL-6 in respiratory samples (bronchial aspirate, BAS) from COVID-19 patients. The test could be easily adapted to detect other cytokines such as TNF-α and IL-8 by changing the antibodies decorating the nanoparticles accordingly. The ability of detecting cytokines in blood and respiratory samples paves the way for monitoring local inflammation in the lungs as well as systemic inflammation levels in the body.
- Published
- 2021
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