title: Lab-on-a-disc for fully integrated multiplex immunoassays.
abstract: This paper 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, cardiac troponin I, and N-terminal pro-B type natriuretic peptide 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 then 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).
authors.affiliation: School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science & Technology, 100 Banyeon-ri, Eonyang-eup, Ulju-gun, Ulsan 689-798, Republic of Korea.
authors.forename: Jiwoon
authors.initials: J
authors.lastname: Park
authors.forename: Vijaya
authors.initials: V
authors.lastname: Sunkara
authors.forename: Tae-Hyeong
authors.initials: TH
authors.lastname: Kim
authors.forename: Hyundoo
authors.initials: H
authors.lastname: Hwang
authors.forename: Yoon-Kyoung
authors.initials: YK
authors.lastname: Cho
mesh_terms: D015415:Biomarkers / Q000032:analysis* / Q000097:blood; D002097:C-Reactive Protein / Q000032:analysis; D002318:Cardiovascular Diseases / Q000175:diagnosis; D003429:Cross Reactions; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D046210:Microfluidic Analytical Techniques; D020097:Natriuretic Peptide, Brain / Q000032:analysis / Q000097:blood; D012463:Saliva / Q000737:chemistry; D019210:Troponin I / Q000032:analysis / Q000097:blood
chemical_list: D015415:Biomarkers; D019210:Troponin I; D020097:Natriuretic Peptide, Brain; D002097:C-Reactive Protein