A Fully Integrated Lab-on-a-Disc for Multiplex Immunoassay from Whole Saliva
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- A Fully Integrated Lab-on-a-Disc for Multiplex Immunoassay from Whole Saliva
- Park, Jiwoon
- Cho, Yoon-Kyoung
- Issue Date
- Graduate School of UNIST
- This research presents a cost-effective, rapid, and fully automated lab-on-a-disc for simultaneous detection of multiple protein biomarkers in raw samples such as whole blood or whole saliva. For the diagnosis of cardiovascular disease, here a novel centrifugal microfluidic layout was designed to conduct the simultaneous detection of high sensitivity C-reactive protein (hsCRP), cardiac troponin I (cTnI), and N-terminal pro-B-type natriuretic peptide (NT-proBNP) based on a bead-based sandwich type enzyme-linked immunosorbent assay (ELISA). Three reaction chambers are initially interconnected for the common processes such as sample injection, incubation, and washing and isolated on-demand for the independent processes such as substrate incubation and final detection. The assay performances such as the limit of detection and the dynamic range were comparable with those of the conventional ELISA despite the significant reduction of the minimum sample volume (200 μL), the amount of washing buffer (700 μL), and the total process time (20 min). In addition, two multiplex assays of three cardiovascular disease markers could be simultaneously conducted on a simple disc-shaped device in a fully automated manner.
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