Kumar, R. orcid.org/0000-0002-6465-6995, Leng, Y., Liu, B. et al. (16 more authors) (2019) Ultrasensitive biosensor based on magnetic microspheres enhanced microfiber interferometer. Biosensors and Bioelectronics, 145. 111563. ISSN 0956-5663
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 Elsevier. |
Keywords: | Biosensor; Human chorionic gonadotropin (hCG); Optical fiber sensor; Optical fiber interferometer |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Civil and Structural Engineering (Sheffield) |
Funding Information: | Funder Grant number National Natural Science Foundation of China 61465009 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 12 Aug 2019 09:54 |
Last Modified: | 09 Dec 2021 14:56 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.bios.2019.111563 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:149559 |