Nanofluidic-Based Accumulation of Antigens for Miniaturized Immunoassay

Sensors

Francesca Ferrera¹  Luca Repetto²  Patrizia Guida²  Elena Angeli²  Giuseppe Firpo²  Denise Pezzuoli²  Diego Repetto² 

[1] Centre of Excellence for Biomedical Research, University of Genoa, viale Benedetto XV 9, 16132 Genoa, Italy;Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy;

关键词: nanofluidic device;    immunoassay;    antibody-antigen recognition;    pdms;    miniaturized device;    nanofunnel;    immunobiosensing;   

DOI  :  10.3390/s20061615

来源: DOAJ

【 摘 要 】

The continuous advances of Nanofluidics have been stimulating the development of novel nanostructures and strategies to accumulate very diluted analytes, for implementing a new class of high sensitivity miniaturized polymeric sensors. We take advantage of the electrokinetic properties of these structures, which allow accumulating analytes inside asymmetric microfluidic structures to implement miniaturized sensors able to detect diluted solutions down to nearly 1.2 pg/mL. In particular, exploiting polydimethylsiloxane devices, fabricated by using the junction gap breakdown technique, we concentrate antigens inside a thin microfunnel functionalized with specific antibodies to favor the interaction and, if it is the case, the recognition between antigens in solution and antibodies anchored to the surface. The transduction mechanism consists in detecting the fluorescence signal of labeled avidin when it binds to biotinylated antigens. Here, we demonstrate that exploiting these electrokinetic phenomena, typical of nanofluidic structures, we succeeded in concentrating biomolecules in correspondence of a 1 pL sensing region, a strategy that grants to the device performance comparable to standard immunoassays.

【 授权许可】

Unknown