Title: Nanopatterned submicron pores as a shield for nonspecific binding in surface plasmon resonance-based sensing
Authors: REBE RAZ SabinaMARCHESINI GerardoBREMER MariaCOLPO PascalPASCUAL GARCIA CESARGIUDETTI GuidoNORDE WillemROSSI Francois
Citation: ANALYST no. 22 p. 5251-5259
Publisher: ROYAL SOC CHEMISTRY
Publication Year: 2012
JRC N°: JRC76105
ISSN: 0003-2654
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC76105
DOI: 10.1039/c2an35521c
Type: Articles in periodicals and books
Abstract: We present a novel approach to tackle the most common drawback of using surface plasmon resonance for analyte screening in complex biological matrices – the nonspecific binding to the sensor chip surface. By using a perforated membrane supported by a polymeric gel structure at the evanescent wave penetration depth, we have fabricated a non-fouling sieve above the sensing region. The sieve shields the evanescent wave from nonspecific interactions which interfere with SPR sensing by minimizing the fouled area of the polymeric gel and preventing the translocation of large particles, e.g. micelles or aggregates. The nanopatterned macropores were fabricated by means of colloidal lithography and plasma enhanced chemical vapor deposition of a polyethylene oxide-like film on top of a polymeric gel matrix commonly used in surface plasmon resonance analysis. The sieve was characterized using surface plasmon resonance imaging, contact angle, atomic force microscopy and scanning electron microscopy. The performance of the sieve was studied using an immunoassay for detection of antibiotic residues in full fat milk and porcine serum. The non-fouling membrane presented pores in the 92–138 nm range organized in a hexagonal crystal lattice with a clearance of about 5% of the total surface. Functionally, the membrane with the nanopatterned macropores showed significant improvements in immunoassay robustness and sensitivity in untreated complex samples. The utilization of the sensor built-in sieve for measurements in complex matrices offers reduction in pre-analytical sample preparation steps and thus shortens the total analysis time.
JRC Directorate:Institute for Health and Consumer Protection Historical Collection

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