Abstract
The enzyme-linked immunosorbent assay (ELISA) is widely used in medical diagnostics. In order to reduce the diagnosis time and to lower the consumption of sample/reagents in an ELISA assay, a suction-type, automatic, pneumatically-driven microfluidic chip has been designed and fabricated in this study. The microfluidic chip integrates a multi-functional micro-transport/mixing unit, for transporting metering and mixing of samples and reagents in order to automatically perform the entire ELISA protocol. A new surface modification has been adopted which allows for a high processing capacity. The detection sensitivity for the dengue virus is found to be 101 PFU/ml, which is much better than a conventional ELISA assay (103 PFU/ml). The entire assay time is only 30 min, which is much faster than with 96-well microtiter plates (4 h). The consumed sample and reagent volume is only 12 μl, which is less than a conventional assay (100 μl). The development of this microfluidic chip may be promising for other immunosensing applications.
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Abbreviations
- BSA:
-
Bovine serum albumin
- CCD:
-
Charge-coupled device
- DI:
-
Deionized
- DV:
-
Dengue virus
- ELISA:
-
Enzyme-linked immunosorbent assay
- EMV:
-
Electromagnetic valve
- EV:
-
Enterovirus
- GA:
-
Glutaraldehyde
- HAU:
-
Hemagglutination unit
- HBV:
-
Hepatitis B virus
- HRP:
-
Horse reddish peroxidase
- IgG:
-
Immunoglobulin G
- IU:
-
International unit
- LBL:
-
Layer-by-layer
- OD:
-
Optical density
- PAA:
-
Poly(acrylic acid)
- PBS:
-
Phosphate buffer saline
- PDMS:
-
Polydimethylsiloxane
- PEI:
-
Poly(ethyleneimine)
- PEM:
-
Polyelectrolyte multilayer
- PFU:
-
Plaque forming unit
- Pluronic P123:
-
Poly (ethylene oxide)-poly (propylene oxide)-poly (ethylene oxide) triblock copolymer
- RT-PCR:
-
Reverse-transcription polymerase chain reaction
- TMB:
-
Tetramethylbenzidin
- UV:
-
Ultraviolet
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Acknowledgements
The authors gratefully acknowledge the financial support provided to this study by the National Science Council in Taiwan (NSC 98-2627-B-006-006; NSC 98-2120-M-006-001).
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Weng, CH., Huang, TB., Huang, CC. et al. A suction-type microfluidic immunosensing chip for rapid detection of the dengue virus. Biomed Microdevices 13, 585–595 (2011). https://doi.org/10.1007/s10544-011-9529-3
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DOI: https://doi.org/10.1007/s10544-011-9529-3