Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7229614 | Biosensors and Bioelectronics | 2018 | 7 Pages |
Abstract
17β-estradiol (17β-E2) plays a critical role in regulating reproduction in human, there is therefore an urgent need to detect it sensitively and precisely in a cost-effective and easy method. In this paper, a label-free integrated microfluidic paper-based analytical device was developed for highly sensitive electrochemical detection of 17β-E2. The microfluidic channel of the paper-based sensor was fabricated with wax printing and the three electrodes, including working, counter and reference electrode were screen-printed. Multi-walled carbon nanotubes (MWCNTs)/ thionine (THI)/ gold nanoparticles (AuNPs) Nano composites were synthesized and coated on screen-printed working electrode (SPWE) for the immobilization of anti-E2. In this electro-chemical system of paper-based immunoassay, THI molecules serving as an electrochemical mediator while MWCNTs and AuNPs, due to their excellent electrical conductivities, could accelerate electron transfer for the signal amplification. Experimental results revealed that the immunoassay is able to detect 17β-E2 as low as 10â¯pgâ¯mLâ1, with a linear range from 0.01 to 100â¯ngâ¯mLâ1. This microfluidic paper-based immunosensor would provide a new platform for low cost, sensitive, specific, and point-of-care diagnosis of 17β-E2.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Yang Wang, Jinping Luo, Juntao Liu, Xinrong Li, Zhuang Kong, Hongyan Jin, Xinxia Cai,