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Processes
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Transport Processes in Polymeric Aqueous Systems
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Transport Processes in Polymeric Aqueous Systems

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Pharmaceutical Processes".

Deadline for manuscript submissions: closed (20 August 2023) | Viewed by 4319

Special Issue Editors

Dr. Ana Cristina Faria Ribeiro

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Guest Editor
Department of Chemistry, University of Coimbra, 3004 - 535 Coimbra, Portugal
Interests: transport properties; thermodynamic properties; electrolytes; polyelectrolytes; polymers; carbohydrates; drugs
Special Issues, Collections and Topics in MDPI journals
Dr. Pedro M.G. Nicolau

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Faculty of Medicine, University of Coimbra, 3000 - 075 Coimbra, Portugal
Interests: clinical investigation; laboratory development of medical devices for prosthodontics and implantology
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Dr. Ana Messias

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Guest Editor
Department of Dentistry, Faculty of Medicine, University of Coimbra, 3000-075 Coimbra, Portugal
Interests: biomechanics; implant dentistry; prosthodontics; fixed prosthodontics; removable prostheses; biomaterials for dentistry; 3D printing
Special Issues, Collections and Topics in MDPI journals
Dr. Sónia I.G. Fangaia

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Institute of Implantology and Prosthodontics, Faculty of Medicine, University of Coimbra, Av. Bissaya Barreto, Blocos de Celas, 3000-075 Coimbra, Portugal
Interests: corrosion; dental alloys; diffusion; transport properties; biochemistry; prosthodontis; prosthetics; tribological properties of dental materials; wear
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The study of transport processes of different components (e.g., drugs, salts and amino acids) in polymeric aqueous systems (e.g., hyaluronic acid) is important both for fundamental reasons, helping to better understand the structure of these systems, and for practical application in fields such as biology, chemistry and medicine. For example, the determination of the transport data of salts solutions in polymers may be helpful toward gaining a deeper insight into the processes of the biological degradation of articles intended for use in medicine, such as artificial organs and surgical sutures. However, despite the many reasons that justify the importance of these complex systems, our understanding of them has not yet been well-established. Therefore, in this Special Issue, we encourage researchers to present their most recent studies regarding various developments in the chemical, pharmaceutical and medicinal fields, with a strong focus on the drugs, salts, carbohydrates and resorcinarenes, and, also, on the characterization of these systems, providing thermodynamic and transport parameters, allowing us to model them for future practical applications. The manuscripts may include research articles and reviews in order to advance the chemical, medicinal and pharmaceutical development.

Dr. Ana Cristina Faria Ribeiro
Dr. Pedro M.G. Nicolau
Prof. Dr. Ana Lucia de Pereira Neves Messias
Dr. Sónia I.G. Fangaia
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. Processes 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 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

  • drugs
  • diffusion
  • polymers
  • salts
  • transport properties
  • thermodynamic properties

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Published Papers (3 papers)

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Research

15 pages, 3103 KiB  
Article
An Assessment of the Chemical Compatibility of Viton Fluoropolymers and Some Harsh Organic Liquid Mixtures
by Marisa C. F. Barros, Ana C. F. Ribeiro and Cecília I. A. V. Santos
Processes 2023, 11(7), 2088; https://doi.org/10.3390/pr11072088 - 13 Jul 2023
Viewed by 1191
Abstract
The molecular transport of a series of industrial solvent mixtures into O-rings of Viton fluoropolymers was studied. Sorption, diffusion, and permeation of the individual liquids toluene, cyclohexane, and methanol, and their binary and ternary mixtures, were evaluated from the solvent uptake using a [...] Read more.
The molecular transport of a series of industrial solvent mixtures into O-rings of Viton fluoropolymers was studied. Sorption, diffusion, and permeation of the individual liquids toluene, cyclohexane, and methanol, and their binary and ternary mixtures, were evaluated from the solvent uptake using a gravimetric method. From the sorption results, the diffusion coefficients were calculated using Fick’s equation. A numerical method was employed to calculate the liquid concentration profiles in cylinder-shaped polymers. The desorption mechanism was also evaluated. The composition dependence of sorption, diffusion, and permeation was assessed, and the results were analysed in terms of potential interactions between polymer and penetrant molecules. Observed sorption of methanol and methanol mixtures by the polymer was very high, in some cases higher than for pure liquids. In general, the amount of methanol present in the mixture determined its diffusion coefficient. Methanol showed the smallest solubility coefficient within the polymer, but due to its high mobility and permeability, it was shown to be the liquid that flows faster through Viton fluoropolymers. Flows of toluene and cyclohexane are still considerable, notwithstanding that this fluoropolymer is usually indicated as hydrocarbon resistant. This is an important fact to keep in mind when choosing sealings for applications with a mix of solvent media. Full article
(This article belongs to the Special Issue Transport Processes in Polymeric Aqueous Systems)
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13 pages, 2510 KiB  
Article
Evaluation of a Resorcinarene-Based Sorbent as a Solid-Phase Extraction Material for the Enrichment of L-Carnitine from Aqueous Solutions
by Gabriel Ramirez, Nicolas Alejandro Cadavid-Montoya and Mauricio Maldonado
Processes 2023, 11(6), 1705; https://doi.org/10.3390/pr11061705 - 2 Jun 2023
Cited by 1 | Viewed by 1386
Abstract
We present five new sorbents for the evaluation of the pre-concentration of L-carnitine. The sorbents were obtained from copolymerization between butylmethacrylate (BuMA) and ethylene dimethacrylate (EDMA), which were physically modified on their surface by each one of the five synthetized resorcinarenes of variable [...] Read more.
We present five new sorbents for the evaluation of the pre-concentration of L-carnitine. The sorbents were obtained from copolymerization between butylmethacrylate (BuMA) and ethylene dimethacrylate (EDMA), which were physically modified on their surface by each one of the five synthetized resorcinarenes of variable chain length studied, with long-chain resorcinarenes exhibiting better fixation on the copolymer. The characterization of the synthesized resorcinarenes was done using FTIR-ATR, 1H NMR, 13C NMR, and mass spectrometry, while characterization of the sorbents was done using FTIR-ATR and scanning electron micrography (SEM). The molecular interaction between L-carnitine and the synthesized resorcinarenes was studied in DMSO via 1H-NMR spectroscopy and, in the gas phase, via electrospray ionization-mass spectrometry (ESI-MS). The results showed that the short-chain resorcinarenes underwent a stable interaction with the neurotransmitter. Once the sorption of resorcinarenes on the copolymer was accomplished, the best parameters for the evaluation of the L-carnitine preconcentration were established. The solution tests were carried out through LC/MS analysis, obtaining better results for L-carnitine absorption with the short-chain resorcinarenes such as tetra(ethyl)calix[4]resorcinarene and tetra(propyl)calix[4]resorcinarene. Full article
(This article belongs to the Special Issue Transport Processes in Polymeric Aqueous Systems)
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11 pages, 516 KiB  
Article
Transport Properties of Carbohydrates: Towards the Minimization Toxicological Risks of Cobalt and Chromium Ions
by Ana C. V. Trindade, Sónia I. G. Fangaia, Pedro M. G. Nicolau, Ana Messias, Ana C. F. Ribeiro, Daniela S. A. Silva, Artur J. M. Valente, M. Melia Rodrigo and Miguel A. Esteso
Processes 2023, 11(6), 1701; https://doi.org/10.3390/pr11061701 - 2 Jun 2023
Cited by 2 | Viewed by 1161
Abstract
The influence of oligosaccharides (α-cyclodextrin, β-cyclodextrin and γ-cyclodextrin), and a polysaccharide, sodium hyaluronate (NaHy), on the diffusion of aqueous solutions of cobalt and chromium chlorides has been investigated. Cobalt and chromium are constituents of metal alloys for biomedical use, including dental prostheses. Thus, [...] Read more.
The influence of oligosaccharides (α-cyclodextrin, β-cyclodextrin and γ-cyclodextrin), and a polysaccharide, sodium hyaluronate (NaHy), on the diffusion of aqueous solutions of cobalt and chromium chlorides has been investigated. Cobalt and chromium are constituents of metal alloys for biomedical use, including dental prostheses. Thus, the release of these ions in the human body can lead to harmful biological effects. The interaction of metal ions with saccharides might have information on the role of mouthwashes in preventing these effects. This interaction has been assessed by measuring multicomponent intermolecular diffusion coefficients at 298.15 K. It has been found that β-cyclodextrin has the highest interaction towards cobalt and chromium ions. This work will contribute to unveiling the mechanisms responsible for transport by diffusion in aqueous solutions, and, therefore, mitigating the potential toxicity inherent to those metal ions. Full article
(This article belongs to the Special Issue Transport Processes in Polymeric Aqueous Systems)
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