MIP-Assisted 3-Hole POF Chip Faced with SPR-POF Sensor for Glyphosate Detection

Author:

Alberti Giancarla1ORCID,Spina Stefano2,Arcadio Francesco2ORCID,Pesavento Maria3,De Maria Letizia4ORCID,Cennamo Nunzio2ORCID,Zeni Luigi2ORCID,Merli Daniele1

Affiliation:

1. Department of Chemistry, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy

2. Department of Engineering, University of Campania Luigi Vanvitelli, Via Roma 29, 81031 Aversa, Italy

3. Optosensing Srl, Via Carlo de Marco, 69/F, 80137 Napoli, Italy

4. Ricerca sul Sistema Energetico (RSE) S.p.A, Via R. Rubattino 54, 20134 Milan, Italy

Abstract

The present study proposes the application of a recently developed optical–chemical sensor system to glyphosate detection. The device probes the refractive index variation in a chip based on a plastic optical fiber (POF) in which three orthogonal micro-holes were created and filled with an acrylic-based molecularly imprinted polymer (MIP). This sensitive chip, connected in series to a gold-coated SPR-POF platform, can modify the surface plasmon resonance (SPR) phenomena by exploiting the multimode characteristic of the POFs. Therefore, the gold film of the SPR-POF platform is not covered by the MIP layer, improving the sensor’s performance because the interaction between the analyte (glyphosate) and the polymer recognition cavities occurs in the core and not in the cladding of the waveguide. Indeed, the sample solution is dropped on the MIP-based chip while a water drop is constantly maintained above the gold surface of the reference SPR-POF platform to excite the surface plasmons, modulated by the MIP interaction with the target analyte. The device is here for the first time applied for glyphosate sensing in water samples. The high sensitivity and selectivity are proven, and tests on real samples highlight the good performances of the developed sensors.

Publisher

MDPI AG

Subject

Physical and Theoretical Chemistry,Analytical Chemistry

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