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Ultrasensitive biosensor based on magnetic microspheres enhanced microfiber interferometer
- Publication Year :
- 2019
- Publisher :
- Elsevier, 2019.
-
Abstract
- A critical barrier for the successful development of fiber sensors for bio-chemical processes is their limitedly improved sensitivity, restricted by the sensor structural design. To solve this, in this paper, a novel concept was proposed using functionalised modified magnetic microspheres (MMSs) to "amplify" the effect of target bio-chemical analytes to significantly improve the fiber sensor's sensitivity, which has been demonstrated using human chorionic gonadotropin (hCG) as an example. Two types of antibody hCG, (β and α, both can specifically bind with hCG), were adhered on the surface of fibre sensor and MMSs respectively. Both hCG and MMSs will be specifically captured by the fibre sensor, where MMSs act as an "amplifier" to improve the sensor sensitivity. Experimentally immunomagnetic detection limit of 0.0001 mIU/mL has been achieved, which is the highest reported so far. This newly developed methodology opens a new direction for sensitivity improvement and could be further explored to applications require ultrahigh sensitivity detections such as earlier medical diagnostics.
- Subjects :
- Analyte
endocrine system
Materials science
business.product_category
H600
Biomedical Engineering
Biophysics
Biosensing Techniques
02 engineering and technology
Chorionic Gonadotropin
01 natural sciences
Magnetics
Limit of Detection
Microfiber
Electrochemistry
Humans
Fiber
G100
Detection limit
business.industry
010401 analytical chemistry
General Medicine
021001 nanoscience & nanotechnology
Microspheres
0104 chemical sciences
Interferometry
Fiber optic sensor
Optoelectronics
0210 nano-technology
business
Sensitivity (electronics)
Biosensor
Biotechnology
Subjects
Details
- Language :
- English
- ISSN :
- 09565663
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....0a51039b57c7dd38d25a70439e6bde0d