Supercritical Techniques and Green Chemistry

A special issue of AppliedChem (ISSN 2673-9623).

Deadline for manuscript submissions: closed (30 November 2022) | Viewed by 6529

Special Issue Editors

Chemical Engineering and Food Technology Department, Institute of Viticulture and Agri-Food Research (IVAGRO), University of Cádiz, Av. República Saharahui s/n, 11510 Puerto Real, Cádiz, Spain
Interests: supercritical fluids; green processes; high pressure extraction; supercritical impregnation; bioactive compounds
Special Issues, Collections and Topics in MDPI journals
Chemical Engineering and Food Technology Department, Science Faculty, University of Cádiz, Av. República Saharahui s/n, 11510 Puerto Real, Cádiz, Spain
Interests: supercritical fluids; green processes; food technology; high pressure extraction; supercritical impregnation; bioactive compounds; food packaging

Special Issue Information

Dear Colleagues,

In recent decades, there has been an important increase in the rapidity of the development of new processes using supercritical fluids. From the initial development of extraction processes using carbon dioxide, we have moved on to the generation of new materials and the study of new processes using this technology. In practically all cases, the common link is the development of a sustainable process that is more environmentally friendly compared to conventional processes. The use of less polluting solvents or the generation of bioenergy in high-pressure reaction processes are some of the main advantages of using this technology.

This Special Issue of AppliedChem will focus on "Supercritical Techniques and Green Chemistry". We are open to contributions (original research articles and high-quality reviews), covering the challenges and achievements in the study of new green processes using supercritical fluids. We want to draw attention to research involving the use of supercritical fluids as a solvent or as a reaction medium for the generation of high value-added products in various industrial sectors (biomedical, food, energy, waste treatment, construction…).

Research areas may include (but are not limited to) the following:

  • Supercritical fluid extraction;
  • Supercritical fluid impregnation;
  • New materials produced by supercritical fluids;
  • Reactions in supercritical fluids.

We look forward to receiving your contributions.

Prof. Dr. Casimiro Mantell
Dr. Cristina Cejudo Bastante
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. AppliedChem is an international peer-reviewed open access quarterly 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 1000 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 fluid extraction
  • supercritical fluid impregnation
  • reactions in supercritical fluids
  • new materials by supercritical fluids

Published Papers (2 papers)

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Research

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11 pages, 2350 KiB  
Article
Supercritical Extraction of a Natural Pyrethrin-Rich Extract from Chrysanthemum Cinerariifolium Flowers to Be Impregnated into Polypropylene Films Intended for Agriculture Applications
AppliedChem 2022, 2(2), 106-116; https://doi.org/10.3390/appliedchem2020007 - 08 Jun 2022
Viewed by 2459
Abstract
The extensive use of synthetic pesticides and their addition to the field presents significant environmental problems that must be minimized. The use of natural insecticides and their addition using techniques that minimize their impact in the field are widely studied by the current [...] Read more.
The extensive use of synthetic pesticides and their addition to the field presents significant environmental problems that must be minimized. The use of natural insecticides and their addition using techniques that minimize their impact in the field are widely studied by the current scientific community. In this work an extraction method based on supercritical CO2 to obtain a pyrethrin-rich natural extract from different varieties of chrysanthemum flowers is analyzed. This extract would be used in a supercritical solvent impregnation (SSI) process to produce a commercial polypropylene (PP) film with insecticidal properties to be used in greenhouses. The extract selected for the impregnation process was that obtained from the Atlantis variety at 35 °C and 10 MPa pressure. The amount of insecticide impregnated into the polymer at 55 °C and under two different pressure levels (10 MPa and 40 MPa) have been determined. A batch impregnation method (BM) with 5 h constant impregnation time and low depressurization rates were used to favor the impregnation process. The results demonstrated that this procedure was suitable to produce pyrethrin-loaded PP films that could to be used in greenhouses as a protection against pests, while allowing a more rational and moderate use of other chemical pesticides. Full article
(This article belongs to the Special Issue Supercritical Techniques and Green Chemistry)
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Review

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25 pages, 1149 KiB  
Review
Application of Supercritical Fluid Extraction (SFE) of Tocopherols and Carotenoids (Hydrophobic Antioxidants) Compared to Non-SFE Methods
AppliedChem 2022, 2(2), 68-92; https://doi.org/10.3390/appliedchem2020005 - 31 May 2022
Cited by 12 | Viewed by 3090
Abstract
Natural antioxidants have renewed value for human health and the food industry. Green labeling is becoming an important attribute for consumers and is impacting food processing and formulations. Clean label is another attribute that ranked third after the “free-from” claims and “a good [...] Read more.
Natural antioxidants have renewed value for human health and the food industry. Green labeling is becoming an important attribute for consumers and is impacting food processing and formulations. Clean label is another attribute that ranked third after the “free-from” claims and “a good source” of nutrient claims. Clean label attributes also are ranked higher than local, seasonal, and organic. Techniques that are able to preserve the valuable characteristics of natural antioxidants, while eliminating even trace amounts of solvent residues from their extraction and processing, are important. Supercritical fluids (SCF) are an effective green technology that can be adopted for extraction of natural antioxidants. This review is focused on the application of supercritical carbon dioxide (SCCO2) for extracting hydrophobic antioxidant compounds with an emphasis on oilseed crops and carrots. The information provided about extraction parameters helps to guide optimization of the yield of tocopherols and carotenoids. Pressure is the most effective parameter for the extraction yield of tocopherol among the other parameters, such as temperature, time, and CO2 flow rate. For carotenoid extraction, both pressure and temperature have a large impact on extraction yield. Higher yields of antioxidants, greater purity of the extracts, and larger retention of bioactivity are the main advantages of supercritical fluid extraction (SFE) in comparison to other conventional techniques. The benefits of SCF technology may open new opportunities for extracting valuable, natural and effective antioxidant compounds from food processing co-streams for use as bioactive compounds. Full article
(This article belongs to the Special Issue Supercritical Techniques and Green Chemistry)
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