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Molecules
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Applications of Fluorescent Sensors in Food and Environment
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Applications of Fluorescent Sensors in Food and Environment

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: 31 December 2024 | Viewed by 1556

Special Issue Editor

Dr. Ivan Pietro Oliveri

E-Mail Website
Guest Editor
Dipartimento di Scienze Chimiche, Università di Catania, Catania, Italy
Interests: molecular materials; vapochromic and vapoluminescent sensors; molecular aggregation; Schiff-base metal complexes; fluorogenic and chromogenic chemosensors

Special Issue Information

Dear Colleagues,

Nowadays, environmental and food safety are deeply interconnected and represent topics of wide interest because of pollution and global climate change caused by anthropogenic activity. In particular, industrial production, transport, intensive agriculture, waste production, chemical processes, etc., involve the release of organic and inorganic pollutants that compromise the healthiness of the four spheres of the ecosystem, the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air), with negative impacts on the quality and genuineness of food. Flourescent sensors play a pivotal role in the prevention of environmental/food pollution and food waste because they are versatile molecular materials that are useful, for example, for the fast, selective and sensitive detection of specific analytes of environmental and food interest, used for real-time monitoring of pollutant emissions and food freshness/quality.

The aim of this Special Issue is to bring together the latest developments in the field of fluorescent sensors for food and environment applications, hosting a mix of original research articles and short critical reviews.

I look forward to receiving your contributions.

Dr. Ivan Pietro Oliveri
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • environmental pollutants
  • food quality
  • heavy metals and anions sensing
  • fluorescent quantum dots
  • luminescent metal organic frameworks (LMOFs)
  • fluorescent polymers
  • fluorescent small molecules and supramolecular sensors
  • vapoluminescent materials

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Published Papers (2 papers)

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Research

15 pages, 2062 KiB  
Article
A Pre-Column Derivatization Method for the HPLC-FLD Determination of Dimethyl and Diethyl Amine in Pharmaceuticals
by Georgios Kamaris, Maria Tsami, Georgiana-Roxana Lotca, Sofia Almpani and Catherine K. Markopoulou
Molecules 2024, 29(23), 5535; https://doi.org/10.3390/molecules29235535 (registering DOI) - 23 Nov 2024
Viewed by 381
Abstract
In recent years, the detection of nitrosamine precursors has become an important issue for regulatory authorities such as the European Medicines Agency (EMA) and the Food and Drug Administration (FDA). The present study provides a pre-column derivatization method for the analysis of dimethylamine [...] Read more.
In recent years, the detection of nitrosamine precursors has become an important issue for regulatory authorities such as the European Medicines Agency (EMA) and the Food and Drug Administration (FDA). The present study provides a pre-column derivatization method for the analysis of dimethylamine (DMA) and diethylamine (DEA) in pharmaceutical products using HPLC and a fluorescence detector. Appropriate chromatographic parameters, including mobile phase composition (organic solvent, buffer, pH), elution type, flow rate, temperature, and λexcitation/emission, were investigated. Analysis was performed at λexcitation = 450 nm and λemission = 540 nm on a C18 column (at 40 °C) using gradient elution as a mobile phase with Eluent A: Phosphoric Acid Buffer (20 mM, pH = 2.8) and Eluent B: methanol, with a flow of 0.8 mL/min. The method was validated according to ICH specifications in terms of linearity (0.5–10 ng/mL for DMA and 5–100 ng/mL for DEA), specificity, and robustness, as well as repeatability, intermediate precision (%RSD < 2.9), and accuracy (% recovery 98.2–102.0%). The derivatization process was optimized using the “Crossed D-Optimal” experimental design procedure, where one mixture component was cross-correlated with two factors. The stability of the samples was studied over a period of one month. To process the samples (pharmaceuticals), various purification techniques were tried using solid/liquid or liquid/liquid extraction with dichloromethane. Finally, a straightforward solid-phase extraction (SPE, C18) method was chosen prior to derivatization. The method was successfully applied, since the extraction recoveries were >81.6% for DMA (0.5 ppm) and >81.1% for DEA (5 ppm). Based on the results obtained and the available literature, the scientific community seeks, by proposing flexible analytical methods, to delimit the problem of nitrosamines. Full article
(This article belongs to the Special Issue Applications of Fluorescent Sensors in Food and Environment)
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17 pages, 7186 KiB  
Article
Fumed-Si-Pr-Ald-Barb as a Fluorescent Chemosensor for the Hg2+ Detection and Cr2O72− Ions: A Combined Experimental and Computational Perspective
by Ghodsi Mohammadi Ziarani, Mahtab Rezakhani, Mehran Feizi-Dehnayebi and Stoyanka Nikolova
Molecules 2024, 29(20), 4825; https://doi.org/10.3390/molecules29204825 - 11 Oct 2024
Viewed by 667
Abstract
The surface of fumed silica nanoparticles was modified by pyridine carbaldehyde and barbituric acid to provide fumed-Si-Pr-Ald-Barb. The structure was identified and investigated through diverse techniques, such as FT-IR, EDX, Mapping, BET, XRD, SEM, and TGA. This nanocomposite was used to detect different [...] Read more.
The surface of fumed silica nanoparticles was modified by pyridine carbaldehyde and barbituric acid to provide fumed-Si-Pr-Ald-Barb. The structure was identified and investigated through diverse techniques, such as FT-IR, EDX, Mapping, BET, XRD, SEM, and TGA. This nanocomposite was used to detect different cations and anions in a mixture of H2O:EtOH. The results showed that fumed-Si-Pr-Ald-Barb can selectively detect Hg2+ and Cr2O72− ions. The detection limits were calculated at about 5.4 × 10−3 M for Hg2+ and 3.3 × 10−3 M for Cr2O72− ions. A computational method (DFT) was applied to determine the active sites on the Pr-Ald-Barb for electrophilic and nucleophilic attacks. The HOMO-LUMO molecular orbital was calculated by B3LYP/6-311G(d,p)/LANL2DZ theoretical methods. The energy gap for the Pr-Ald-Barb and Pr-Ald-Barb+ion complexes was predicted by the EHOMO and ELUMO values. The DFT calculation confirms the suggested experimental mechanism for interacting the Pr-Ald-Barb with ions. Full article
(This article belongs to the Special Issue Applications of Fluorescent Sensors in Food and Environment)
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