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Chemosensors
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Raman and Surface-Enhanced Raman Scattering Techniques in Analytical and Biomedical...
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Raman and Surface-Enhanced Raman Scattering Techniques in Analytical and Biomedical Fields

A special issue of Chemosensors (ISSN 2227-9040). This special issue belongs to the section "Analytical Methods, Instrumentation and Miniaturization".

Deadline for manuscript submissions: 31 October 2024 | Viewed by 2277

Special Issue Editors

Dr. Leonardo Negri Furini

E-Mail Website
Guest Editor
Departamento de Física, Universidade Federal de Santa Catarina, Florianopolis, SC, Brazil
Interests: Raman spectroscopy; detection of pesticides/contaminants via SERS; analysis of pesticides/contaminants in biological systems via Raman
Dr. Rafael Jesus Gonçalves Rubira

E-Mail Website
Guest Editor
Exact Sciences (IGCE) Physics Department, Institute of Geosciences, São Paulo State University–UNESP, Rio Claro 13506-900, SP, Brazil
Interests: Raman spectroscopy; detection of pesticides/contaminants via SERS; analysis of pesticides/contaminants in biological systems via Raman

Special Issue Information

Dear Colleagues,

Raman and Surface-Enhanced Raman Scattering (SERS) techniques have advanced significantly, becoming a powerful analytical tool in materials science, pharmaceuticals, biosensors, environmental monitoring, and the analysis of biological systems. Raman technology has developed high-resolution imaging and portable systems for on-site analysis, while SERS has improved sensitivity to detect low concentrations of analytes. SERS has applications in biosensors and diagnostics, with the potential to revolutionize the medical field for disease detection and monitoring of therapeutic treatments. These advances make Raman technology and SERS versatile and valuable tools for future research and applications.

Dr. Leonardo Negri Furini
Dr. Rafael Jesus Gonçalves Rubira
Guest Editors

Manuscript Submission Information

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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

  • Raman spectroscopy
  • SERS
  • detection of pesticides
  • environmental contaminants
  • nanoparticles
  • biological systems
  • biosensors
  • chemical surface

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Published Papers (3 papers)

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Research

14 pages, 4077 KiB  
Article
Sensitive Detection of Fungicide Folpet by Surface-Enhanced Raman Scattering: Experimental and Theoretical Approach
by Oumaima Douass, Bousselham Samoudi and Santiago Sanchez-Cortes
Chemosensors 2024, 12(9), 186; https://doi.org/10.3390/chemosensors12090186 - 12 Sep 2024
Viewed by 268
Abstract
In this work, Surface-Enhanced Raman Spectroscopy (SERS) was employed as an effective detection technique for folpet, characterized by its notable specificity and sensitivity. The investigation involved the use of UV–Vis, Raman, and SERS spectroscopy of folpet at different concentrations for a comprehensive study [...] Read more.
In this work, Surface-Enhanced Raman Spectroscopy (SERS) was employed as an effective detection technique for folpet, characterized by its notable specificity and sensitivity. The investigation involved the use of UV–Vis, Raman, and SERS spectroscopy of folpet at different concentrations for a comprehensive study of plasmon-driven effects such as plasmon resonance, plasmon hybridization, and electric field enhancement resulting in the SERS’ intensification. Specifically, SERS detection of folpet solutions at concentrations below 100 µM is presented in detail by using Ag nanoparticles prepared with hydroxylamine reduction. The experimentation encompassed diverse conditions to optimize the detection process, with Raman spectra acquired for both folpet powder and aqueous solution of folpet at the natural pH. SERS analyses were conducted across a concentration range of 9.5 × 10−8 to 1.61 × 10−4 M, employing 532 nm excitation. The differences in the spectral profiles observed for folpet Raman powder and SERS are ascribed to N–S cleavage; these changes are attributed to plasmon catalysis induced by the used Ag nanoparticles. Transmission electron microscopy (TEM) was also important in the present analysis to better understand which mechanism of nanoparticles aggregation is more favorable for the SERS detection regarding the formation of hot spots in the suspension. Complementing the experimental data, the molecular structure and theoretical Raman spectra of the folpet molecule were calculated through density functional theory (DFT) methods. The outcomes of these calculations were crucial in the elucidation of folpet’s vibrational modes. The culmination of this research resulted in the successful detection of folpet, achieving a notable limit of detection at 4.78 × 10−8 M. This comprehensive approach amalgamates experimental and theoretical methodologies, offering significant insights into the detection capabilities and molecular characteristics of folpet via SERS analysis. Full article
(This article belongs to the Special Issue Raman and Surface-Enhanced Raman Scattering Techniques in Analytical and Biomedical Fields)
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15 pages, 2780 KiB  
Article
Enhanced Sensitivity and Homogeneity of SERS Signals on Plasmonic Substrate When Coupled to Paper Spray Ionization–Mass Spectrometry
by Adewale A. Adehinmoye, Ebenezer H. Bondzie, Jeremy D. Driskell, Christopher C. Mulligan and Jun-Hyun Kim
Chemosensors 2024, 12(9), 175; https://doi.org/10.3390/chemosensors12090175 - 2 Sep 2024
Viewed by 585
Abstract
This work reports on the development of an analyte sampling strategy on a plasmonic substrate to amplify the detection capability of a dual analytical system, paper spray ionization–mass spectrometry (PSI-MS) and surface-enhanced Raman spectroscopy (SERS). While simply applying only an analyte solution to [...] Read more.
This work reports on the development of an analyte sampling strategy on a plasmonic substrate to amplify the detection capability of a dual analytical system, paper spray ionization–mass spectrometry (PSI-MS) and surface-enhanced Raman spectroscopy (SERS). While simply applying only an analyte solution to the plasmonic paper results in a limited degree of SERS enhancement, the introduction of plasmonic gold nanoparticles (AuNPs) greatly improves the SERS signals without sacrificing PSI-MS sensitivity. It is initially revealed that the concentration of AuNPs and the type of analytes highly influence the SERS signals and their variations due to the “coffee ring effect” flow mechanism induced during sampling and the degree of the interfacial interactions (e.g., van der Waals, electrostatic, covalent) between the plasmonic substrate and analyte. Subsequent PSI treatment at high voltage conditions further impacts the overall SERS responses, where the signal sensitivity and homogeneity significantly increase throughout the entire substrate, suggesting the ready migration of adsorbed analytes regardless of their interfacial attractive forces. The PSI-induced notable SERS enhancements are presumably associated with creating unique conditions for local aggregation of the AuNPs to induce effective plasmonic couplings and hot spots (i.e., electromagnetic effect) and for repositioning analytes in close proximity to a plasmonic surface to increase polarizability (i.e., chemical effect). The optimized sampling and PSI conditions are also applicable to multi-analyte analysis by SERS and MS, with greatly enhanced detection capability and signal uniformity. Full article
(This article belongs to the Special Issue Raman and Surface-Enhanced Raman Scattering Techniques in Analytical and Biomedical Fields)
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13 pages, 2839 KiB  
Article
Molecular Understanding of the Surface-Enhanced Raman Spectroscopy Salivary Fingerprint in People after Sars-COV-2 Infection and in Vaccinated Subjects
by Francesca Rodà, Alice Gualerzi, Silvia Picciolini, Luana Forleo, Valentina Mangolini, Roberta Mancuso, Simone Agostini, Rudy Alexander Rossetto, Paola Pierucci, Paolo Innocente Banfi and Marzia Bedoni
Chemosensors 2024, 12(7), 136; https://doi.org/10.3390/chemosensors12070136 - 11 Jul 2024
Viewed by 783
Abstract
The rapid spread of SARS-COV-2 and the millions of worldwide deaths and hospitalizations have prompted an urgent need for the development of screening tests capable of rapidly and accurately detecting the virus, even in asymptomatic people. The easy collection and the biomarker content [...] Read more.
The rapid spread of SARS-COV-2 and the millions of worldwide deaths and hospitalizations have prompted an urgent need for the development of screening tests capable of rapidly and accurately detecting the virus, even in asymptomatic people. The easy collection and the biomarker content of saliva, together with the label-free and informative power of surface-enhanced Raman spectroscopy (SERS) analysis have driven the creation of point-of-care platforms capable of identifying people with COVID-19. Indeed, different salivary fingerprints were observed between uninfected and infected people. Hence, we performed a retrospective analysis of SERS spectra from salivary samples of COVID-19-infected and -vaccinated subjects to understand if viral components and/or the immune response are implicated in spectral variations. The high sensitivity of the proposed SERS-based method highlighted the persistence of molecular alterations in saliva up to one month after the first positive swab, even when the subject tested negative for the rapid antigenic test. Nevertheless, no specific spectral patterns attributable to some viral proteins and immunoglobulins involved in COVID-19 infection and its progression were found, even if differences in peak intensity, presence, and position were observed in the salivary SERS fingerprint. Full article
(This article belongs to the Special Issue Raman and Surface-Enhanced Raman Scattering Techniques in Analytical and Biomedical Fields)
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