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A Microfluidic Paper-Based Origami Nanobiosensor for Label-Free, Ultrasensitive Immunoassays
- Source :
- Advanced healthcare materials. 5(11)
- Publication Year :
- 2015
-
Abstract
- Microfluidic paper-based analytical devices (μPADs) represent a promising platform technology for point-of-care diagnosis. Highly sensitive, rapid, and easy-to-perform immunoassays implemented on μPADs are desirable to fulfill the promise of the μPAD technology. This article reports the first microfluidic paper-based origami nanobiosensor (origami μPAD), which integrates zinc oxide nanowires (ZnO NWs) and electrochemical impedance spectroscopy (EIS) biosensing mechanism, for label-free, ultrasensitive immunoassays. The EIS mechanism features simple and label-free assay operations which take less than 25 min to be finished, while the ZnO NWs allow covalent bonding for immobilizing probe proteins and improve the biosensing performance with such features as high surface-area-to-volume ratios and high sensitivity to surface binding. The calibration of the device reveals an ultralow limit of detection (LOD) of 60 fg mL(-1) (>100 times lower than those of existing μPADs) for rabbit immunoglobulin G in phosphate-buffered saline. The detection of human immunodeficiency virus p24 antigen in human serum with a low LOD of 300 fg mL(-1) (>33 times lower than that of a commercial p24 antigen test kit) is also demonstrated. This novel μPAD design offers ultrahigh sensitivity, short assay time, and ease of operation, and thus possesses significant potential for low-cost, rapid molecular diagnosis of early-stage diseases.
- Subjects :
- Paper
Materials science
Microfluidics
Biomedical Engineering
Pharmaceutical Science
Nanotechnology
HIV Infections
02 engineering and technology
Biosensing Techniques
01 natural sciences
Sensitivity and Specificity
Biomaterials
Humans
Human immunodeficiency virus p24 antigen
Label free
Detection limit
Immunoassay
010401 analytical chemistry
HIV
Paper based
Microfluidic Analytical Techniques
021001 nanoscience & nanotechnology
P24 antigen
0104 chemical sciences
Highly sensitive
Early Diagnosis
Calibration
0210 nano-technology
Biosensor
Subjects
Details
- ISSN :
- 21922659
- Volume :
- 5
- Issue :
- 11
- Database :
- OpenAIRE
- Journal :
- Advanced healthcare materials
- Accession number :
- edsair.doi.dedup.....8720ce56cf3ba03da369bf1b918731c2