scholarly journals Single Drop Detection of Furfural in Wine by an SPR-Optical Fiber-MIP Based Sensor

Proceedings ◽  
2020 ◽  
Vol 60 (1) ◽  
pp. 22
Author(s):  
Maria Pesavento ◽  
Nunzio Cennamo ◽  
Luigi Zeni ◽  
Letizia De Maria ◽  
Giancarla Alberti ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Food Samples ◽  
Human Beings ◽  
Single Drop ◽  
Imprinted Polymer ◽  
Practical Applications ◽  
Carcinogenic Effects ◽  
The One ◽  
Mip Sensor

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.

scholarly journals SPR-Optical Fiber-Molecularly Imprinted Polymer Sensor for the Detection of Furfural in Wine

Biosensors ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 72
Author(s):  
Maria Pesavento ◽  
Luigi Zeni ◽  
Letizia De Maria ◽  
Giancarla Alberti ◽  
Nunzio Cennamo
Keyword(s):  
Optical Fiber ◽  
Molecularly Imprinted Polymer ◽  
Real Life ◽  
Human Beings ◽  
Imprinted Polymer ◽  
Carcinogenic Effect ◽  
Molecularly Imprinted ◽  
Fermented Beverages ◽  
Practical Applications ◽  
Mip Sensor

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 furfural (2-furaldheide, 2-FAL) in fermented beverages like wine. MIPs have been demonstrated to be a very convenient biomimetic receptor in the proposed sensing device, being easy and rapid to develop, suitable for on-site determinations at low concentrations, and cheap. Moreover, the MIP film thickness can be changed to modulate the sensing parameters. The possibility of performing single drop measurements is a further favorable aspect for practical applications. For example, the use of an SPR-MIP sensor for the analysis of 2-FAL in a real life matrix such as wine is proposed, obtaining a low detection limit of 0.004 mg L−1. The determination of 2-FAL in fermented beverages is becoming a crucial task, mainly for the effects of the furanic compounds on the flavor of food and their toxic and carcinogenic effect on human beings.

scholarly journals Sensing of Furfural by Molecularly Imprinted Polymers on Plasmonic and Electrochemical Platforms

Proceedings ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 48
Author(s):  
Pesavento ◽  
Cennamo ◽  
Alberti ◽  
Marchetti ◽  
Zeni
Keyword(s):  
Molecularly Imprinted Polymers ◽  
Low Cost ◽  
Human Beings ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Detectable Concentration ◽  
Carcinogenic Effects ◽  
Furanic Compounds ◽  
Safety Applications

The goal of this work is to test the possibility of selective detection of furfural (2-FAL) in aqueous solutions, with a molecularly imprinted polymer (MIP) receptor exploiting two different transduction methods, for food safety applications. In particular, sensors with electrochemical and surface plasmon resonance (SPR) transduction are considered. Two concentration ranges could be investigated by the different sensing approaches since the detectable concentration level depends on the sensitivity of the detection technique employed. The determination of 2-FAL at different concentration levels in the aqueous medium of interest, as for example beverages, is becoming a very crucial task not only for the relevance of furanic compounds in affecting the flavor but also for their possible toxic and carcinogenic effects on the human beings. For these reasons, their determination by a fast, easy and low-cost method is of interest. The sensor methods here proposed appears to be particularly suitable, since, although together and not individually, they allow the determination in a wide concentration range.

scholarly journals Contractor’s bid pricing strategy: a model with correlation among competitors’ prices

2019 ◽  
Vol 9 (1) ◽  
pp. 159-166
Author(s):  
Piotr Jaśkowski ◽  
Agata Czarnigowska
Keyword(s):  
Probabilistic Method ◽  
Indirect Costs ◽  
Pricing Strategy ◽  
Bidding Strategy ◽  
Direct And Indirect Costs ◽  
Practical Applications ◽  
Construction Companies ◽  
Simulation Based ◽  
The One

AbstractThe approach used by construction companies to determine bid prices is an element of their strategy used to win jobs in competitive tenders. Such strategies build upon an analysis of the contactor’s potential and capabilities (am I able to deliver? am I eligible to participate in the tender?), and the analysis of the economic environment, including the expected behavior of competitors. The tender strategy sets out both the guidelines and the procedure in deciding whether or not to bid as well as the rules for determining the price. The price, on the one hand, should be high enough to cover expected direct and indirect costs as well as risk-adjusted profit. On the other hand, it needs to be low enough to be considered most attractive (typically: the lowest) among the prices offered by the competitors. The paper focuses on the price definition component of the bidding strategy. It provides a brief overview of the existing methods that support bidding decisions by comparing their demand for input and limitations in practical applications and presents a simulation-based method supporting the determination of the profit ratio. This probabilistic method assumes the existence of a positive correlation between the prices offered by the competitors. Its application is illustrated by means of a numerical example. The outcomes of the simulation prompt the amount of the profit margin that maximizes the expected value of the contractor’s profit.

Novel Cd(II) Ion Imprinted Polymer Coated on Multiwall Carbon Nanotubes as a Highly Selective Sorbent for Cadmium Determination in Food Samples

2014 ◽  
Vol 97 (1) ◽  
pp. 173-178 ◽  
Author(s):  
Forouzan Aboufazeli ◽  
Hamid Reza Lotfi Zadeh Zhad ◽  
Omid Sadeghi ◽  
Mohammad Karimi ◽  
Ezzatollah Najafi
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Food Samples ◽  
Standard Reference Materials ◽  
Ion Imprinted Polymer ◽  
Imprinted Polymer ◽  
Ion Imprinted ◽  
Low Levels ◽  
Multiwall Carbon

Abstract The application of a novel Cd(II) ion imprinted polymer coated on multiwall carbon nanotubes was investigated for preconcentration and determination of low levels of Cd ions. This novel sorbentwas characterized by scanning electron microscopy, thermal gravimetric/differential thermal analysis, elemental analysis, and FTIR spectrometry. Effects of various factors, such as pH of the sample solution, eluent (type, concentration, and volume), and flow rates of the sample and eluent, were evaluated in this study. To investigate the selectivity of the sorbent toward Cd(II) ions, the effects of a variety of ions on preconcentration and recovery of Cd(II) ions were investigated. TheLOD was 1.3 ng/mL; the recovery and RSD of the method were 96.4% and below 3.1%, respectively. Validation of the method was performed by analyzing some standard reference materials with certified Cd(II) concentrations. Finally, the sorbent was applied for separation and determination of Cd(II)ions in food samples.

scholarly journals Electrochemical Biosensor Based on Furosemide-Gold Nanoparticles for The Determination of Dopamine for Practical Applications

2021 ◽  
Vol 5 (1) ◽  
Keyword(s):  
Gold Nanoparticles ◽  
Average Particle Size ◽  
Average Particle ◽  
Limit Of Quantification ◽  
Strong Absorption Band ◽  
Amperometric Determination ◽  
Practical Applications ◽  
Vis Spectroscopy ◽  
The One

In this study, by taking the advantage of the facile & controlled synthesis of furosemide derived gold nanoparticles (Fr-AuNps) for rapid and sensitive amperometric determination of dopamine (DP). The one-step synthesis of FrAuNps was carried out at room temperature without the use of strong reducing agents. The synthesized Fr-AuNps were studied by UV-Vis spectroscopy, and a strong absorption band for gold nanoparticles was observed at 520 nm. Transmission electron micrographs (TEM) revealed the average particle size below 100 nm. HRTEM showed excellent crystalline features as prepared gold nanoparticles. The electrochemical behavior of gold nanoparticles was examined by cyclic voltammetry (CV) which demonstrated the enhanced electrocatalytic kinetics activity towards the oxidation of dopamine. The presented dopamine biosensor exhibited a linear response for the dopamine in the range of 0.25 to 7 µM. The calculated the detection limit found to be 18.3 nM and limit of quantification 61.5 nM respectively. The proposed dopamine biosensor was successfully employed for the quantification of trace amount of dopamine from human serum and the obtained results are very satisfactory.

Using an Optical Probe as the Microdrop Holder in Headspace Single Drop Microextraction: Determination of Sulfite in Food Samples

2016 ◽  
Vol 88 (20) ◽  
pp. 10296-10300 ◽  
Author(s):  
Serhii Zaruba ◽  
Andriy B. Vishnikin ◽  
Jana Škrlíková ◽  
Vasil Andruch
Keyword(s):  
Optical Probe ◽  
Food Samples ◽  
Single Drop ◽  
Single Drop Microextraction

scholarly journals Melamine Recognition: Molecularly Imprinted Polymer for Selective and Sensitive Determination of Melamine in Food Samples

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Mohadese Biabani ◽  
Azizollah Nezhadali ◽  
Ahmad Nakhaei ◽  
Hossein Nakhaei
Keyword(s):  
Limit Of Detection ◽  
Electrochemical Techniques ◽  
Food Samples ◽  
Quantitative Measurements ◽  
Sensitive Determination ◽  
Burman Design ◽  
Mip Sensor ◽  
Optimized Conditions ◽  
Plackett Burman Design

In this study, a sensitive and selective sensor is constructed to measure the melamine (MEL) using molecular imprinting polymer (MIP) technique. Chemical and electrochemical techniques are used to construct the MIP and quantitative measurements. The constructed sensor was modified with GO-Fe3O4@SiO2 nanocomposite. Screening and optimization of factors are done using statistical methods, including Plackett–Burman design (PBD) and central composite design (CCD). Under the optimized conditions, an MIP sensor showed a linear range from 5.0 × 10−7 to 1.0 × 10−5 M MEL concentration with a correlation coefficient (R2) of 0.9997. The limit of detection was obtained (0.028 µM) with a highly reproducible response (RSD 2.15%, n = 4). The electrochemical sensor showed good results for the determination of MEL in food samples.

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