Ultrasensitive biosensor based on magnetic microspheres enhanced microfiber interferometer

Rahul Kumar, Yuankui Leng, Bin Liu, Jun Zhou, Liyang Shao, Jinhui Yuan, Xinyu Fan, Shengpeng Wan, Tao Wu, Juan Liu, Richard Binns, Yong Qing Fu, Wai Pang Ng, Gerald Farrell, Yuliya Semenova, Hengyi Xu, Yonghua Xiong, Xingdao He, Qiang Wu

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
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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.
Original languageEnglish
Article number111563
JournalBiosensors and Bioelectronics
Volume145
Early online date6 Aug 2019
DOIs
Publication statusPublished - 1 Dec 2019

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