Analytical Chemistry: Techniques and Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Chemical and Molecular Sciences".

Deadline for manuscript submissions: 31 May 2024 | Viewed by 1279

Special Issue Editors


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Guest Editor
Department of Chemistry and Physics, Federal University of Espírito Santo, Vitoria-Gasteiz, Brazil
Interests: HPLC; LC/MS; NMR; natural product; bioactive compounds; bioassays; analytical method validation; phytochemistry; chemical ecology; CG/MS; metabolomics; toxicity; phytotherapic; organic chemistry

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Guest Editor
Nucleus of Research in Sciences and Technology, University of Franca, Franca 14404-600, SP, Brazil
Interests: isolation; structural clarification; analytical studies; biological tests and biotransformation of bioactive plant secondary metabolites

Special Issue Information

Dear Colleagues,

This Special Issue aims to disseminate articles for the rapid publication of original research papers, articles, and reviews on research developments in all areas of analytical chemistry, such as electroanalytical, spectroscopic analysis, and mass spectrometry. Articles considered for publication should focus on instrumentation development, improvements and applications, new sensors and applications in analyzing and quantifying active principles from different matrices, as well as the validation and development of analytical methods and methodologies. Thus, articles on analytical chemistry applied to similar areas of science, such as organic chemistry, geosciences, biological sciences, nanotechnology, engineering, and environmental sciences, will be considered.

Prof. Dr. Mario Ferreira Conceição Santos
Prof. Dr. Sergio Ambrosio
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. Applied Sciences 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 2400 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

  • analytical chemistry
  • method development
  • instrumentation
  • validation
  • organic matrices

Published Papers (2 papers)

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Research

11 pages, 780 KiB  
Article
Utilizing Cost-Effective Determination Techniques to Authenticate Cosmetics
by Shaoming Jin, Hongren Qu, Xiao Ning, Shenghui Cui and Jin Cao
Appl. Sci. 2024, 14(8), 3198; https://doi.org/10.3390/app14083198 - 10 Apr 2024
Viewed by 303
Abstract
(1) Background: The adulteration of cosmetics has become increasingly common, which seriously harms ordinary consumers. The counterfeit cosmetics pointed out in this study mainly refer to imitating genuine products in terms of ingredients and packaging. Ordinary consumers cannot distinguish their authenticity solely based [...] Read more.
(1) Background: The adulteration of cosmetics has become increasingly common, which seriously harms ordinary consumers. The counterfeit cosmetics pointed out in this study mainly refer to imitating genuine products in terms of ingredients and packaging. Ordinary consumers cannot distinguish their authenticity solely based on appearance and daily use. If there is a convenient and low-cost detection method that can expose this phenomenon of adulteration, it will be able to expose adulteration and protect the interests of consumers quickly and conveniently. (2) Methods: MALDI-TOF, GC-MS, and mid-IR were used to develop low-cost and fast methods for identifying the authenticity of cosmetics. Five types of liquid and five types of emulsion cosmetics purchased from container and wholesale markets were analyzed using the three instruments mentioned above, and their spectra and acquired data were carefully compared to determine their authenticity. MALDI-TOF and GC-MS directly tested cosmetic samples, and mid-IR spectroscopy tested the ink on the outer packaging of cosmetics. (3) Results: The data procured by MALDI-TOF can provide a representation of its product attributes; two liquid samples and one paste sample demonstrated inconsistent test outcomes with the corresponding reference samples, suggesting contamination. The results of GC-MS can illustrate the substance count within cosmetic samples; the comparison outcomes of the total ion chromatogram indicate that one paste sample was a counterfeit. The results attained from mid-IR were consonant with those acquired from the MALDI-TOF analysis and GC-MS. (4) Conclusions: These three newly developed techniques can all be effectively utilized for the task of detecting cosmetic adulteration and quality control in the manufacturing process. With regard to user-friendliness and rapidity, both MALDI-TOF and mid-IR outperform GC-MS, demonstrating consistently superior levels of detection. Conversely, GC-MS has unique advantages in identifying emulsion cosmetics containing a high amount of weak polarity and volatile substances. Consequently, these corresponding methods could serve as efficient and cost-effective ways to detect authenticity issues in real-world cosmetic products. Full article
(This article belongs to the Special Issue Analytical Chemistry: Techniques and Applications)
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12 pages, 1900 KiB  
Article
Water-Based Microwave-Assisted Digestion Method for Electrochemical and Chromatographic Determination of Total Fluoride Ions in Toothpaste Samples
by Mbuyamba Divin Mukendi and Nomvano Mketo
Appl. Sci. 2023, 13(24), 13315; https://doi.org/10.3390/app132413315 - 17 Dec 2023
Viewed by 776
Abstract
Fluoride ions are the major constituents of dental products because they prevent cavities through bacterial growth inhibition. However, excessive consumption of fluoride ions results in fluorosis, thereby causing tooth staining and roughness. Therefore, there is a crucial need to develop rapid and effective [...] Read more.
Fluoride ions are the major constituents of dental products because they prevent cavities through bacterial growth inhibition. However, excessive consumption of fluoride ions results in fluorosis, thereby causing tooth staining and roughness. Therefore, there is a crucial need to develop rapid and effective methods for monitoring fluoride levels in dental products. The current study describes a greener water-based microwave-assisted digestion (WB-MAD) prior to fluoride-ion-selective electrode (F-ISE) measurement for the determination of fluoride ions in various toothpaste products. The optimum conditions of the developed WB-MAD method were 180 °C digestion temperature, 60 min digestion time, 0.05 g toothpaste amount and 10 mL distilled water. Under the optimum conditions, the method detection limit (MDL) of 0.00302 µg/kg and the method quantification limit (MQL) of 0.01007 µg/kg obtained were favorably comparable with the literature reports. The proposed WB-MAD method was both accurate (99.2 to 101%) and precise (≤0.75%) for the quantitative determination of F in toothpaste samples using F-ISE. Furthermore, the newly developed WB-MAD method showed better accuracy (97–100%) than the traditional microwave-assisted acid digestion methods (71–92%). It is worth indicating that since water was used as the only digestion reagent, it was possible to validate the F-ISE results with ion chromatography (IC). The percentage recoveries obtained from IC (91–104%) and F-ISE (93–100%) were statistically insignificant. In view of the validation data, the proposed WB-MAD method can be considered as an alternative to the conventional microwave-assisted acid digestion (MAAD) methods for the determination of F in toothpaste samples containing sodium monofluorophosphate. Full article
(This article belongs to the Special Issue Analytical Chemistry: Techniques and Applications)
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