title: On-chip determination of C-reactive protein using magnetic particles in continuous flow.
abstract: We demonstrate the application of a multilaminar flow platform, in which functionalized magnetic particles are deflected through alternating laminar flow streams of reagents and washing solutions via an external magnet, for the rapid detection of the inflammatory biomarker, C-reactive protein (CRP). The two-step sandwich immunoassay was accomplished in less than 60 s, a vast improvement on the 80-300 min time frame required for enzyme-linked immunosorbent assays (ELISA) and the 50 min necessary for off-chip magnetic particle-based assays. The combination of continuous flow and a stationary magnet enables a degree of autonomy in the system, while a detection limit of 0.87 μg mL(-1) makes it suitable for the determination of CRP concentrations in clinical diagnostics. Its applicability was further proven by assaying real human serum samples and comparing those results to values obtained using standard ELISA tests.
authors.affiliation: Department of Chemistry, The University of Hull , Cottingham Road, Hull, HU6 7RX, United Kingdom.
authors.forename: Chayakom
authors.initials: C
authors.lastname: Phurimsak
authors.forename: Mark D
authors.initials: MD
authors.lastname: Tarn
authors.forename: Sally A
authors.initials: SA
authors.lastname: Peyman
authors.forename: John
authors.initials: J
authors.lastname: Greenman
authors.forename: Nicole
authors.initials: N
authors.lastname: Pamme
mesh_terms: D002097:C-Reactive Protein / Q000032:analysis*; D004867:Equipment Design; D006801:Humans; D007118:Immunoassay / Q000191:economics / Q000295:instrumentation*; D057230:Limit of Detection; D060328:Magnetic Phenomena; D008280:Magnetics / Q000295:instrumentation; D059346:Magnets / Q000737:chemistry*; D046210:Microfluidic Analytical Techniques / Q000191:economics / Q000295:instrumentation*
chemical_list: D002097:C-Reactive Protein