Abstract

A surface plasmon resonance (SPR) platform, based on a D-shaped plastic optical fiber (POF), combined with a biomimetic receptor, i.e., a molecularly imprinted polymer (MIP), is proposed to detect 2-furaldheide (2-FAL) in fermented beverages such as wine. The determination of 2-FAL in food samples is becoming a very crucial task, on the one hand for its role in the flavor and on the other in relation to its toxic and carcinogenic effects on human beings. The proposed sensing device is easy to use and cheap; it has been tested successfully for the detection and quantification of substances of interest in different fields, such as health, the environment and industry. The possibility of performing single-drop measurements is a further favorable aspect for practical applications. As an example, the use of an SPR-MIP sensor for the analysis of 2-FAL in wine, in a concentration range useful for practical applications, is here described.

Highlights

  • Biosensors and chemical sensors in optical fibers have been shown to be able to play an important role in numerous application fields [1,2,3,4,5], in particular the devices based on the surface plasmon resonance (SPR) phenomenon have shown promising merits of low-cost, high sensitivity, and small-size [6,7,8,9,10,11].The Kretschmann and Otto configurations are widely used in practice, but these sensor systems usually require bulky and expensive optical equipment

  • The optical sensor system here proposed has been developed by our research group [12,13,14,15,16,17,18,19] and is based on a multilayer structure realized on a planar surface of exposed core plastic optical fiber (POF), embedded in a resin block (D-shaped POF platform), with the molecularly imprinted polymer (MIP) receptor for 2-FAL detection deposited on the gold film

  • Kaff is the affinity constant of 2-FAL for the MIP, cint is the concentration of the specific sites obtained by the molecular imprinting, g is the mass of polymer. λmax=k g cint is the maximum resonance wavelength shift ( λ) obtained at high concentration of analyte

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Summary

Introduction

Biosensors and chemical sensors in optical fibers have been shown to be able to play an important role in numerous application fields [1,2,3,4,5], in particular the devices based on the SPR phenomenon have shown promising merits of low-cost, high sensitivity, and small-size [6,7,8,9,10,11].The Kretschmann and Otto configurations are widely used in practice, but these sensor systems usually require bulky and expensive optical equipment. Biosensors and chemical sensors in optical fibers have been shown to be able to play an important role in numerous application fields [1,2,3,4,5], in particular the devices based on the SPR phenomenon have shown promising merits of low-cost, high sensitivity, and small-size [6,7,8,9,10,11]. Incorporating optical fiber makes it possible to reduce the cost and dimensions of the SPR sensors, with the possibility to integrate the sensing platform with small optoelectronic devices (sources and detectors). The optical sensor system here proposed has been developed by our research group [12,13,14,15,16,17,18,19] and is based on a multilayer structure realized on a planar surface of exposed core POF, embedded in a resin block (D-shaped POF platform), with the MIP receptor for 2-FAL detection deposited on the gold film.

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