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Special Issue "Chemical Applications of Supercritical Fluids"

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

Deadline for manuscript submissions: 30 September 2021.

Special Issue Editors

Dr. Luisella Verotta
E-Mail Website
Guest Editor
Department of Environmental Science and Policy, University of Milan, via C. Golgi 19, I-20133 Milan, Italy
Interests: secondary metabolites from plants; isolation and structure elucidation; green isolation techniques; saponins; phloroglucinols; polyphenols; synthesis and semi-synthesis of natural compounds of pharmaceutical relevance; medicinal chemistry; antimicrobial; antiprotozoal and non-cytotoxic chemopreventive naturally derived compounds; biopolymers for biomedical applications; valorization of agro-industrial waste biomasses for bioactive natural products; supercritical CO2 extraction
Special Issues and Collections in MDPI journals
Dr. Stefania Marzorati
E-Mail Website
Guest Editor
Department of Environmental Science and Policy, Università degli Studi di Milano, via Celoria 2, 20133 Milan, Italy
Interests: bioactive compounds from agro-industrial wastes; supercritical CO2 extraction; green technologies; pigments and bioactives from algae and microalgae; materials chemistry and electrochemistry; carbon-based materials from pyrolysis of biomass waste; nano-structured materials for (bio)electrochemical systems and energy applications

Special Issue Information

Dear Colleagues,

According to global trends, industrial processes and academic researchers are always looking for “green” products and technologies that are able to replace conventional ones.

Over the last several decades, there has been renewed interest in supercritical fluids owing to their unique properties and relatively low environmental impact in order to overcome the concerns related to conventional solvents methodologies.

Supercritical fluids are highly compressed gases which combine the properties of gases and liquids in an intriguing manner. Fluids such as supercritical carbon dioxide offer a wide range of unusual chemical possibilities in both analytical and materials chemistry. In addition, supercritical fluids lead to reactions which are difficult or even impossible to achieve in conventional solvents. Finally, supercritical fluids enable selective extractions, opening the possibility to apply the technique in waste valorization, yielding lipophilic compounds with no need of concentration steps, and even more polar ones, with the proper addition of co-solvents.

The present Special Issue entitled “Chemical Applications of Supercritical Fluids” will gather and publish original articles and review papers regarding the use of supercritical fluids as environmentally acceptable alternatives to conventional solvents for extraction, synthetic, analytical, and materials chemistry, on the following topics:

  • Bioactives extraction with supercritical CO2;
  • Removal of pollutants/contaminants from matrices;
  • Polymerization reactions and purification of polymers;
  • Enzymatically assisted reactions;
  • Organic synthesis;
  • Extraction and purification of food supplements, nutraceuticals, and active ingredients for pharmaceuticals;
  • Precipitation/synthesis of nanostructured solids;
  • Organometallic and hydrogenation reactions;
  • Solute/supercritical fluids phase equilibria studies;
  • Mathematical modelling and design of processes.

Dr. Luisella Verotta
Dr. Stefania Marzorati
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 papers will be 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 2000 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

  • Supercritical fluids
  • Supercritical CO2 extraction
  • Green technologies
  • Nanostructured materials
  • Enzymes-assisted reactions
  • Organic synthesis
  • Polymers

Published Papers (2 papers)

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Research

Article
Supercritical CO2 Extraction of Palladium Oxide from an Aluminosilicate-Supported Catalyst Enhanced by a Combination of Complexing Polymers and Piperidine
Molecules 2021, 26(3), 684; https://doi.org/10.3390/molecules26030684 - 28 Jan 2021
Viewed by 524
Abstract
Precious metals, in particular Pd, have a wide range of applications in industry. Due to their scarcity, precious metals have to be recycled, preferably with green and energy-saving recycling processes. In this article, palladium extraction from an aluminosilicate-supported catalyst, containing about 2 wt% [...] Read more.
Precious metals, in particular Pd, have a wide range of applications in industry. Due to their scarcity, precious metals have to be recycled, preferably with green and energy-saving recycling processes. In this article, palladium extraction from an aluminosilicate-supported catalyst, containing about 2 wt% (weight%) of Pd (100% PdO), with supercritical CO2 (scCO2) assisted by complexing polymers is described. Two polymers, p(FDA)SH homopolymer and p(FDA-co-DPPS) copolymer (FDA: 1,1,2,2-tetrahydroperfluorodecyl acrylate; DPPS: 4-(diphenylphosphino)styrene), were tested with regards to their ability to extract palladium. Both polymers showed relatively low extraction conversions of approximately 18% and 30%, respectively. However, the addition of piperidine as activator for p(FDA-co-DPPS) allowed for an increase in the extraction conversion of up to 60%. Full article
(This article belongs to the Special Issue Chemical Applications of Supercritical Fluids)
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Article
Effect of CO2 Flow Rate on the Extraction of Astaxanthin and Fatty Acids from Haematococcus pluvialis Using Supercritical Fluid Technology
Molecules 2020, 25(24), 6044; https://doi.org/10.3390/molecules25246044 - 21 Dec 2020
Cited by 3 | Viewed by 833
Abstract
Haematococcus pluvialis is the largest producer of natural astaxanthin in the world. Astaxanthin is a bioactive compound used in food, feed, nutraceutics, and cosmetics. In this study, astaxanthin extraction from H. pluvialis by supercritical fluid extraction was evaluated. The effects of temperature (40 [...] Read more.
Haematococcus pluvialis is the largest producer of natural astaxanthin in the world. Astaxanthin is a bioactive compound used in food, feed, nutraceutics, and cosmetics. In this study, astaxanthin extraction from H. pluvialis by supercritical fluid extraction was evaluated. The effects of temperature (40 and 50 °C), pressure (40 and 50 MPa), and CO2 flow rate (2 and 4 L/min) were investigated. The results showed that the highest astaxanthin recovery was obtained at 50 °C/50 MPa and the CO2 flow rates evaluated had no significant effect. It was possible to achieve astaxanthin recoveries of 95% after 175 min for a CO2 flow rate of 2 L/min, and 95 min for CO2 flow rate of 4 L/min. The ω-6/ω-3 ratios obtained were similar in all conditions, reaching 0.87, demonstrating that the extracts from H. pluvialis by SFE are rich in unsaturated fatty acids (UFA) which increases their positive effects when used as a functional ingredient in food. Full article
(This article belongs to the Special Issue Chemical Applications of Supercritical Fluids)
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