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Chemosensors
Special Issues
Nanotechnology for Sensing, Medical and Environmental Application
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Nanotechnology for Sensing, Medical and Environmental Application

A special issue of Chemosensors (ISSN 2227-9040). This special issue belongs to the section "Materials for Chemical Sensing".

Deadline for manuscript submissions: closed (20 June 2022) | Viewed by 21046

Special Issue Editors

Dr. Jana Drbohlavová

E-Mail Website
Guest Editor
1. Department of Microelectronics, Faculty of Electrical Engineering and Communication, Brno University Technology, Brno, Czech Republic
2. CEITEC—Central European Institute of Technology, Brno University of Technology, 61200 Brno, Czech Republic
Interests: nanotechnology for sensing, medical and environmental applications
Dr. Agnieszka Mech

E-Mail
Guest Editor
DG JRC, European Commission, 21027 Ispra, Italy
Interests: nanotechnology; spectroscopy; nanomaterials; fluorescence; optoelectronics

Special Issue Information

Dear Colleagues,

The Special Issue is focused on smart (active, adaptive, stimuli-responsive) nanomaterials used in chemosensors, which can be applied in several fields, namely the biomedical, cosmetic, and electronic fields as well as in the agriculture and the food sectors.

The examples include but are not limited to the following areas of application:

  • In medicine: nanocarriers, nanoencapsulates, disease prevention, therapy, non-invasive and point-of-care diagnosis, etc.
  • In cosmetics: stimuli-responsive nanocapsules designed to enclose a cosmetic ingredient able to treat different skin conditions
  • In food sector and food packaging: nanomaterials to prevent nutrients or other molecules from breaking down in the body and to allow a slow release at a target specific location, real time food quality and food safety monitoring or remediation, etc.
  • In agriculture: nanomaterials for targeted release and delivery of water, nutrients, agrochemicals and antimicrobials to crops, for real-time detection and monitoring of plant pathogens and stress conditions, etc.

Currently, assessing and predicting the behaviour of smart nanomaterials and their possible toxicological effects after release into the environment and during their whole life cycle remain challenging. Therefore, these nanomaterials, especially new generations (e.g., nanohybrids), should address safety and sustainability issues at the early stage of the design process rather than relying on control and measures to retroactively mitigate their impact on human health and the environment.

This Special Issue will provide a forum for the latest research activities in the field. Both review articles and research papers are welcome.

Dr. Jana Drbohlavová
Dr. Agnieszka Mech
Guest Editors

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. Chemosensors is an international peer-reviewed open access monthly 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

  • nanotechnology
  • smart nanomaterials
  • stimuli-responsive
  • safe innovation
  • safe and sustainable by design

Published Papers (6 papers)

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Research

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17 pages, 3108 KiB  
Article
Determination of Ascorbic Acid in Pharmaceuticals and Food Supplements with the New Potassium Ferrocyanide-Doped Polypyrrole-Modified Platinum Electrode Sensor
by Ancuța Dinu and Constantin Apetrei
Chemosensors 2022, 10(5), 180; https://doi.org/10.3390/chemosensors10050180 - 9 May 2022
Cited by 7 | Viewed by 2915
Abstract
This paper reports the results obtained from the determination of ascorbic acid with platinum-based voltammetric sensors modified with potassium hexacyanoferrate-doped polypyrrole. The preparation of the modified electrodes was carried out by electrochemical polymerization of pyrrole from aqueous solutions, using chronoamperometry. Polypyrrole films were [...] Read more.
This paper reports the results obtained from the determination of ascorbic acid with platinum-based voltammetric sensors modified with potassium hexacyanoferrate-doped polypyrrole. The preparation of the modified electrodes was carried out by electrochemical polymerization of pyrrole from aqueous solutions, using chronoamperometry. Polypyrrole films were deposited on the surface of the platinum electrode, by applying a constant potential of 0.8 V for 30 s. The thickness of the polymer film was calculated from the chronoamperometric data, and the value was 0.163 μm. Cyclic voltammetry was the method used for the Pt/PPy-FeCN electrode electrochemical characterization in several types of solution, including KCl, potassium ferrocyanide, and ascorbic acid. The thin doped polymer layer showed excellent sensitivity for ascorbic acid detection. From the voltammetric studies carried out in solutions of different concentrations of ascorbic acid, ranging from 1 to 100 × 10−6 M, a detection limit of 2.5 × 10−7 M was obtained. Validation of the analyses was performed using pharmaceutical products with different concentrations of ascorbic acid, from different manufacturers and presented in various pharmaceutical forms, i.e., intravascular administration ampoules, chewable tablets, and powder for oral suspension. Full article
(This article belongs to the Special Issue Nanotechnology for Sensing, Medical and Environmental Application)
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14 pages, 3598 KiB  
Article
pH-Induced Modulation of Vibrio fischeri Population Life Cycle
by Ana Rita Silva, Cláudia Sousa, Daniela Exner, Ruth Schwaiger, Maria Madalena Alves, Dmitri Y. Petrovykh and Luciana Pereira
Chemosensors 2021, 9(10), 283; https://doi.org/10.3390/chemosensors9100283 - 5 Oct 2021
Cited by 4 | Viewed by 2910
Abstract
Commonly used as biological chemosensors in toxicity assays, Vibrio fischeri bacteria were systematically characterized using complementary physicochemical and biological techniques to elucidate the evolution of their properties under varying environmental conditions. Changing the pH above or below the optimal pH 7 was used [...] Read more.
Commonly used as biological chemosensors in toxicity assays, Vibrio fischeri bacteria were systematically characterized using complementary physicochemical and biological techniques to elucidate the evolution of their properties under varying environmental conditions. Changing the pH above or below the optimal pH 7 was used to model the long-term stress that would be experienced by V. fischeri in environmental toxicology assays. The spectral shape of bioluminescence and cell-surface charge during the exponential growth phase were largely unaffected by pH changes. The pH-induced modulation of V. fischeri growth, monitored via the optical density (OD), was moderate. In contrast, the concomitant changes in the time-profiles of their bioluminescence, which is used as the readout in assays, were more significant. Imaging at discrete timepoints by scanning electron microscopy (SEM) and helium-ion microscopy (HIM) revealed that mature V. fischeri cells maintained a rod-shaped morphology with the average length of 2.2 ± 1 µm and diameter of 0.6 ± 0.1 µm. Detailed morphological analysis revealed subpopulations of rods having aspect ratios significantly larger than those of average individuals, suggesting the use of such elongated rods as an indicator of the multigenerational environmental stress. The observed modulation of bioluminescence and morphology supports the suitability of V. fischeri as biological chemosensors for both rapid and long-term assays, including under environmental conditions that can modify the physicochemical properties of novel anthropogenic pollutants, such as nanomaterials and especially stimulus-responsive nanomaterials. Full article
(This article belongs to the Special Issue Nanotechnology for Sensing, Medical and Environmental Application)
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15 pages, 4652 KiB  
Article
Electrochemical Sensing and Removal of Cesium from Water Using Prussian Blue Nanoparticle-Modified Screen-Printed Electrodes
by Prem. C. Pandey, Hari Prakash Yadav, Shubhangi Shukla and Roger J. Narayan
Chemosensors 2021, 9(9), 253; https://doi.org/10.3390/chemosensors9090253 - 7 Sep 2021
Cited by 8 | Viewed by 2322
Abstract
Selective screening followed by the sensing of cesium radionuclides from contaminated water is a challenging technical issue. In this study, the adsorption functionality of Prussian blue (PB) nanoparticles was utilized for the detection and efficient removal of cesium cations. An efficient PB nanoparticle-modified [...] Read more.
Selective screening followed by the sensing of cesium radionuclides from contaminated water is a challenging technical issue. In this study, the adsorption functionality of Prussian blue (PB) nanoparticles was utilized for the detection and efficient removal of cesium cations. An efficient PB nanoparticle-modified screen-printed electrode (SPE) in the three-electrode configuration was developed for the electrochemical sensing and removal of Cs+. PB nanoparticles inks were obtained using a facile two-step process that was previously described as suitable for dispensing over freshly prepared screen-printed electrodes. The PB nanoparticle-modified SPE induced a cesium adsorption-dependent chronoamperometric signal based on ion exchange as a function of cesium concentration. This ion exchange, which is reversible and rapid, is associated with electron transfer in the PB nanoparticle-modified SPE. Using this electrochemical adsorption system (EAS) based on chronoamperometry, the maximum adsorption capacity (Qmax) of Cs+ ions in the PB nanoparticle-modified SPE reached up to 325 ± 1 mg·g−1 in a 50 ± 0.5 μM Cs+ solution, with a distribution coefficient (Kd) of 580 ± 5 L·g−1 for Cs+ removal. The cesium concentration-dependent adsorption of PB nanoparticles was also demonstrated by fluorescence spectroscopy based on fluorescence quenching of PB nanoparticles as a function of cesium concentration using a standard fluorophore like fluorescein in a manner analogous to that previously reported for As(III). Full article
(This article belongs to the Special Issue Nanotechnology for Sensing, Medical and Environmental Application)
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14 pages, 1698 KiB  
Article
Novel Electrochemical Molecularly Imprinted Polymer-Based Biosensor for Tau Protein Detection
by Amira Ben Hassine, Noureddine Raouafi and Felismina T. C. Moreira
Chemosensors 2021, 9(9), 238; https://doi.org/10.3390/chemosensors9090238 - 25 Aug 2021
Cited by 21 | Viewed by 4226
Abstract
A novel electrochemical biosensor based on a molecularly imprinted polymer (MIP) was developed for the impedimetric determination of Tau protein, a biomarker of Alzheimer’s disease (AD). Indeed, a recent correlation between AD symptoms and the presence of Tau proteins in their aggregated form [...] Read more.
A novel electrochemical biosensor based on a molecularly imprinted polymer (MIP) was developed for the impedimetric determination of Tau protein, a biomarker of Alzheimer’s disease (AD). Indeed, a recent correlation between AD symptoms and the presence of Tau proteins in their aggregated form made hyperphosphorylated Tau protein (Tangles) a promising biomarker for Alzheimer’s diagnosis. The MIP was directly assembled on a screen-printed carbon electrode (C-SPE) and prepared by electropolymerization of 3-aminophenol (AMP) in the presence of the protein template (p-Tau-441) using cyclic voltammetry. The p-Tau-441 protein bound to the polymeric backbone was digested by the action of the proteolytic activity of proteinase K in urea and then washed away to create vacant sites. The performances of the corresponding imprinted and non-imprinted electrodes were evaluated by electrochemical impedance spectroscopy. The detection limit of the MIP-based sensors was 0.02 pM in PBS buffer pH 5.6. Good selectivity and good results in serum samples were obtained with the developed platform. The biosensor described in this work is a potential tool for screening Tau protein on-site and an attractive complement to clinically established methodologies methods as it is easy to fabricate, has a short response time and is inexpensive. Full article
(This article belongs to the Special Issue Nanotechnology for Sensing, Medical and Environmental Application)
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13 pages, 3181 KiB  
Article
Silver Nanoparticles Grown on Cross-Linked Poly (Methacrylic Acid) Microspheres: Synthesis, Characterization, and Antifungal Activity Evaluation
by Panagiotis Kainourgios, Leto-Aikaterini Tziveleka, Ioannis A. Kartsonakis, Efstathia Ioannou, Vassilios Roussis and Costas A. Charitidis
Chemosensors 2021, 9(7), 152; https://doi.org/10.3390/chemosensors9070152 - 23 Jun 2021
Cited by 7 | Viewed by 2403
Abstract
Silver nanoparticles (AgNPs) exert profound physicochemical, biological, and antimicrobial properties, therefore, they have been extensively studied for a variety of applications such as food packaging and cultural heritage protection. However, restrictions in their stability, aggregation phenomena, and toxicity limit their extensive use. Hence, [...] Read more.
Silver nanoparticles (AgNPs) exert profound physicochemical, biological, and antimicrobial properties, therefore, they have been extensively studied for a variety of applications such as food packaging and cultural heritage protection. However, restrictions in their stability, aggregation phenomena, and toxicity limit their extensive use. Hence, the use of functional substrates that promote the silver nanoparticles’ growth and allow the formation of uniform-sized, evenly distributed, as well as stable nanoparticles, has been suggested. This study reports on the fabrication and the characterization of hydrophilic polymer spheres including nanoparticles with intrinsic antifungal properties. Poly (methacrylic acid) microspheres were synthesized, employing the distillation precipitation method, to provide monodisperse spherical substrates for the growth of silver nanoparticles, utilizing the co-precipitation of silver nitrate in aqueous media. The growth and the aggregation potential of the silver nanoparticles were studied, whereas the antifungal activity of the produced nanostructures was evaluated against the black mold-causing fungus Aspergillus niger. The produced structures exhibit dose-dependent antifungal activity. Therefore, they could potentially be employed for the protection and preservation of cultural heritage artifacts and considered as new agents for food protection from fungal contamination during storage. Full article
(This article belongs to the Special Issue Nanotechnology for Sensing, Medical and Environmental Application)
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Review

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59 pages, 14207 KiB  
Review
Application of Metal-Organic Framework-Based Composites for Gas Sensing and Effects of Synthesis Strategies on Gas-Sensitive Performance
by Bo Huang, Yanqiong Li and Wen Zeng
Chemosensors 2021, 9(8), 226; https://doi.org/10.3390/chemosensors9080226 - 14 Aug 2021
Cited by 18 | Viewed by 4704
Abstract
Gas sensing materials, such as semiconducting metal oxides (SMOx), carbon-based materials, and polymers have been studied in recent years. Among of them, SMOx-based gas sensors have higher operating temperatures; sensors crafted from carbon-based materials have poor selectivity for gases and longer response times; [...] Read more.
Gas sensing materials, such as semiconducting metal oxides (SMOx), carbon-based materials, and polymers have been studied in recent years. Among of them, SMOx-based gas sensors have higher operating temperatures; sensors crafted from carbon-based materials have poor selectivity for gases and longer response times; and polymer gas sensors have poor stability and selectivity, so it is necessary to develop high-performance gas sensors. As a porous material constructed from inorganic nodes and multidentate organic bridging linkers, the metal-organic framework (MOF) shows viable applications in gas sensors due to its inherent large specific surface area and high porosity. Thus, compounding sensor materials with MOFs can create a synergistic effect. Many studies have been conducted on composite MOFs with three materials to control the synergistic effects to improve gas sensing performance. Therefore, this review summarizes the application of MOFs in sensor materials and emphasizes the synthesis progress of MOF composites. The challenges and development prospects of MOF-based composites are also discussed. Full article
(This article belongs to the Special Issue Nanotechnology for Sensing, Medical and Environmental Application)
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