Multiple Zones Modification of Open Off-Stoichiometry Thiol-Ene Microchannel by Aptamers: A Methodological Study & A Proof of Concept

Chemosensors

Samantha Bourg¹  Anne Varenne¹  Fanny d’Orlyé¹  Sophie Griveau¹  Fethi Bedioui¹  JoseAlberto Fracassi da Silva² 

[1] Chimie ParisTech, PSL University, CNRS 2027, Institute of Chemistry for Life and Health Sciences, 75005 Paris, France;Department of Analytical Chemistry-Chemistry Institute, State University of Campinas, Campinas 13083-970, Brazil;

关键词: OSTE polymer microchannel;    multi-zone functionalization;    aptamer;    gold nanoparticles;   

DOI  :  10.3390/chemosensors8020024

来源: DOAJ

【 摘 要 】

Off-stoichiometry thiol-ene polymer (OSTE) is an emerging thermoset with interesting properties for the development of lab-on-a-chip (LOAC), such as easy microfabrication process, suitable surface chemistry for modification and UV-transparency. One of the challenges for LOAC development is the integration of all the analytical steps in one microchannel, and particularly, trace level analytes extraction/preconcentration steps. In this study, two strategies for the immobilization of efficient tools for this purpose, thiol-modified (C3-SH) aptamers, on OSTE polymer surfaces were developed and compared. The first approach relies on a direct UV-initiated click chemistry reaction to graft thiol-terminated aptamers on ene-terminated OSTE surfaces. The second strategy consists of the immobilization of thiol-terminated aptamers onto OSTE substrates covered by gold nanoparticles. The presence of an intermediate gold nanoparticle layer on OSTE has shown great interest in the efficient immobilization of aptamers, preserving their interaction with the target, and preventing non-specific adsorption. With this second innovative strategy, we proved, for the first time the concept of creating multiple functional zones for sample treatment in an open OSTE-microchannel thanks to the immobilization of aptamers in consecutive areas by the simple droplet deposition methodology. This methodological development allows further consideration of OSTE material for lab-on-a-chip designs, integrating multiple zones for sample pretreatment, based on molecular recognition by ligands, such as aptamers, in a specific zone of the microchannel and is adaptable to a large range of analytical applications for LOAC industrialization.

【 授权许可】

Unknown