Abstract
This article reports a MEMS (Micro-Electro-Mechanical-Systems)-based column separator designed for potential integration with portable medical point-of-care testing (POCT) devices. The MEMS column uses size exclusion chromatography (SEC) to pre-separate raw samples by size, and is made of polydimethylsiloxane (PDMS) fabricated on a glass slide. The MEMS SEC column separates 300 ng/mL of beta-human chorionic gonadotropin (β-hCG), a cancer biomarker, from a fibrin-ogen-rich solution (20 μg/mL) in 10 min, showing 2.12 resolution and 0.036 mm plate height through fluorescent detection. Results are further verified by β-hCG and anti-β-hCG antibody conjugate using surface plasmon resonance (SPR). The collected β-hCG-rich eluent at 8 min shows 11 mDeg of angle shift. The fluorescent detection and SPR results demonstrate the complete discrimination of β-hCG from fibrinogen using the MEMS SEC column, and illustrate its viability for integrating a sample preparation stage in POCT devices to assist cancer screening and prognosis.
Original language | English (US) |
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Pages (from-to) | 477-484 |
Number of pages | 8 |
Journal | Microfluidics and Nanofluidics |
Volume | 8 |
Issue number | 4 |
DOIs | |
State | Published - Apr 1 2010 |
Keywords
- MEMS
- MEMS SEC column
- Miniaturization
- Separation
- Size exclusion chromatography
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Materials Chemistry