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Polymers
Special Issues
Renewable Polysaccharides: Structure and Applications
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Renewable Polysaccharides: Structure and Applications

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Chemistry".

Deadline for manuscript submissions: closed (25 April 2022) | Viewed by 2681

Special Issue Editors

Dr. Oshrat Levy-Ontman

E-Mail Website
Guest Editor
Green Processes Center, Department of Chemical Engineering, Sami Shamoon College of Engineering, Beer-Sheva 8410001, Israel
Interests: antiviral bioactivity; antioxidants; drug delivery; glycosylation; inflammation; red algae; renewable polysaccharides; rheology; structure and function of polysaccharides
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Adi Wolfson

E-Mail Website
Co-Guest Editor
Green Processes Center, Department of Chemical Engineering, Sami Shamoon College of Engineering, Beersheba 84100, Israel
Interests: green chemistry; green engineering; catalysis; heterogenization of complexes; polysaccharides

Special Issue Information

Dear Colleagues,

Since the turn of the century, renewable polysaccharides derived from various organisms have attracted a lot of attention in the scientific community. Besides their renewability and biodegradability, polysaccharides' diverse functional groups and unique physicochemical properties indicate that they could be an environmentally friendly alternative to synthetic polymers. Moreover, they possess a variety of bioactivities (including anti-inflammatory, anti-viral, antioxidant, immunomodulatory, antitumor, etc.) that render them potential candidates for a range of different biotechnology applications. Indeed, many of these natural polysaccharides are already being used in the biomedical and food industries, catalysis, and the energy sector, among others. To date, however, the complex structural forms and biodiversity of polysaccharides have precluded them from being rigorously explored to enable the full realization of their potential.

The aim of this Special Issue is to present the latest advances in the development of renewable polysaccharide applications and to obtain insight into the fundamental relationship between their structures and their properties. It is therefore with immense pleasure that we invite you to contribute an article to the upcoming Special Issue.

Dr. Oshrat Levy-Ontman
Prof. Dr. Adi Wolfson
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. Polymers 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 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

  • applications
  • anti-inflammatory
  • antioxidants
  • bioactivities
  • polysaccharides
  • structural characterization
  • renewability
  • rheology

Published Papers (1 paper)

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Research

10 pages, 3394 KiB  
Article
Green Procedure for Aerobic Oxidation of Benzylic Alcohols with Palladium Supported on Iota-Carrageenan in Ethanol
by Eliraz Stamker, Oshrat Levy-Ontman and Adi Wolfson
Polymers 2021, 13(4), 498; https://0-doi-org.brum.beds.ac.uk/10.3390/polym13040498 - 05 Feb 2021
Cited by 7 | Viewed by 2015
Abstract
The search for selective heterogeneous catalysts for the aerobic oxidation of alcohols to ketones and aldehydes has drawn much attention in the last decade. To that end, different palladium-based catalysts have been proposed that use various organic and inorganic supports. In addition, supports [...] Read more.
The search for selective heterogeneous catalysts for the aerobic oxidation of alcohols to ketones and aldehydes has drawn much attention in the last decade. To that end, different palladium-based catalysts have been proposed that use various organic and inorganic supports. In addition, supports that originate from a biological and renewable source that is also nontoxic and biodegradable were found to be superior. We heterogenized palladium chloride or acetate complexes with triphenylphosphine trisulfonate on iota-carrageenan xerogel by simple mixing of the complex and the polysaccharide in water. The resulting polysaccharide-catalyst mixture then underwent deep freeze and lyophilization, after which the catalyst was characterized by TEM, XPS and SEM-EDS and tested in aerobic oxidation. The new heterogeneous catalysts were successfully used for the first time in the aerobic oxidation of benzylic alcohols. Moreover, they were easily removed from the reaction mixture and recycled, yielding an increase in activity with each subsequent reuse. As determined by TEM and XPS, the reduction in palladium and the formation of nanoparticles during the reaction in ethanol yielded more active species and, therefore, higher conversion rates. A SEM-EDS analysis indicated that the palladium was thoroughly dispersed in the xerogel catalysts. Moreover, the xerogel catalyst was observed to undergo a structural change during the reaction. To conclude, the new heterogeneous catalyst was prepared by a simple and straightforward method that used a non-toxic, renewable and biodegradable support to yield an active, selective and recyclable heterogeneous system. Full article
(This article belongs to the Special Issue Renewable Polysaccharides: Structure and Applications)
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