Toward integrated detection and graphene-based removal of contaminants in a lab-on-a-chip platform
Chałupniak, Andrzej (Institut Català de Nanociència i Nanotecnologia)
Merkoçi, Arben (Institut Català de Nanociència i Nanotecnologia)

Data:	2017
Resum:	A novel, miniaturized microfluidic platform was developed for the simultaneous detection and removal of polybrominated diphenyl ethers (PBDEs). The platform consists of a polydimethylsiloxane (PDMS) microfluidic chip for an immunoreaction step, a PDMS chip with an integrated screen-printed electrode (SPCE) for detection, and a PDMS-reduced graphene oxide (rGO) chip for physical adsorption and subsequent removal of PBDE residues. The detection was based on competitive immunoassay-linked binding between PBDE and PBDE modified with horseradish peroxidase (HRP-PBDE) followed by the monitoring of enzymatic oxidation of o-aminophenol (o-AP) using square wave anodic stripping voltammetry (SW-ASV). PBDE was detected with good sensitivity and a limit of detection similar to that obtained with a commercial colorimetric test (0. 018 ppb), but with the advantage of using lower reagent volumes and a reduced analysis time. The use of microfluidic chips also provides improved linearity and a better reproducibility in comparison to those obtained with batch-based measurements using screen-printed electrodes. In order to design a detection system suitable for toxic compounds such as PBDEs, a reduced graphene oxide-PDMS composite was developed and optimized to obtain increased adsorption (based on both the hydrophobicity and π-π stacking between rGO and PBDE molecules) compared to those of non-modified PDMS. To the best of our knowledge, this is the first demonstration of electrochemical detection of flame retardants and a novel application of the rGO-PDMS composite in a biosensing system. This system can be easily applied to detect any analyte using the appropriate immunoassay and it supports operation in complex matrices such as seawater.
Ajuts:	European Commission 613844 Ministerio de Economía y Competitividad SEV-2013-0295 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-260
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Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Electrochemistry ; Microfluidics ; Graphene oxide ; Flame retardants ; Lab on a chip ; Polydimethylsiloxane
Publicat a:	Nano research, Vol. 10, Issue 7 (July 2017) , p. 2296-2310, ISSN 1998-0000

DOI: 10.1007/s12274-016-1420-3

Postprint 27 p, 1.5 MB

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