Special Issue "Inspired by Nature: Antioxidants and Nanotechnology"

A special issue of Antioxidants (ISSN 2076-3921).

Deadline for manuscript submissions: 28 February 2018

Special Issue Editors

Guest Editor
Prof. Dr. Claus Jacob

Division of Bioorganic Chemistry, School of Pharmacy, Saarland University, D-66123 Saarbruecken, Germany
Website | E-Mail
Phone: 00496813023129
Interests: intracellular thiolstat; natural nanoparticles, reactive sulfur species; redox modulation; selenium; sensor/effector catalysts
Guest Editor
Prof. Dr. Cornelia M. Keck

Division of Pharmaceutics and Biopharmaceutics, Faculty of Pharmacy, Philipps University Marburg, D-35032 Marburg, Germany
Website | E-Mail
Interests: nanocarriers for improved delivery of poorly soluble acitves—nanolipids, nanocrystals; characterization and optimization of nanosystems; pharmaceutical; nutraceutical and cosmetic formulations

Special Issue Information

Dear Colleagues,

The last few decades have witnessed considerable advances in nano- and biotechnology. The interface between these two rapidly and successfully expanding areas provides ample opportunities for research in, and development of, new, innovative natural nanoproducts. Indeed, nature itself is an excellent nanotechnologist and endows us with a range of fine particles, from inorganic ash, sooth, sulfur and mineral particles found in the air or in mineral wells, to sulfur and selenium nanoparticles produced by many yeasts and bacteria. It also inspires us to use natural products to manufacture nanomaterials, such as nanocrystals of antioxidants or fine particles of silver, which can be obtained by a range of physical, chemical and even biochemical methods. Many of these natural nanoparticles exhibit pronounced yet specific biological activities. Their potential uses in medicine or agriculture close the cycle of natural materials which are initially harvested or obtained from natural sources and subsequently are applied for various benefits in nature.

This Special Issue will consider the current progress in this field of natural nanomaterials. It will bring together researchers focusing on naturally occuring nanoparticles as well as colleagues interested in nanosizing natural products. In both cases, i.e., natural nanosize materials and nanosized natural materials, the overarching theme will be on applications of these products in medicine, agriculture and related branches, for instance as antioxidants and food supplements in nutrition, as preventive or therapeutic agents in mecidine, in cosmetics, and as phytoprotectants or soil enrichment in agriculture.

Prof. Dr. Claus Jacob
Prof. Dr. Cornelia M. Keck
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. Antioxidants 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 550 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

  • Natural nanoparticles
  • Nanonization of natural products
  • Precipitation
  • Redox
  • Antimicrobial activity
  • Antioxidant activity

Published Papers (2 papers)

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Research

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Open AccessArticle Resuspendable Powders of Lyophilized Chalcogen Particles with Activity against Microorganisms
Antioxidants 2018, 7(2), 23; doi:10.3390/antiox7020023
Received: 8 December 2017 / Revised: 22 January 2018 / Accepted: 23 January 2018 / Published: 27 January 2018
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Abstract
Many organic sulfur, selenium and tellurium compounds show considerable activity against microorganisms, including bacteria and fungi. This pronounced activity is often due to the specific, oxidizing redox behavior of the chalcogen-chalcogen bond present in such molecules. Interestingly, similar chalcogen-chalcogen motifs are also found
[...] Read more.
Many organic sulfur, selenium and tellurium compounds show considerable activity against microorganisms, including bacteria and fungi. This pronounced activity is often due to the specific, oxidizing redox behavior of the chalcogen-chalcogen bond present in such molecules. Interestingly, similar chalcogen-chalcogen motifs are also found in the elemental forms of these elements, and while those materials are insoluble in aqueous media, it has recently been possible to unlock their biological activities using naturally produced or homogenized suspensions of respective chalcogen nanoparticles. Those suspensions can be employed readily and often effectively against common pathogenic microorganisms, still their practical uses are limited as such suspensions are difficult to transport, store and apply. Using mannitol as stabilizer, it is now possible to lyophilize such suspensions to produce solid forms of the nanoparticles, which upon resuspension in water essentially retain their initial size and exhibit considerable biological activity. The sequence of Nanosizing, Lyophilization and Resuspension (NaLyRe) eventually provides access to a range of lyophilized materials which may be considered as easy-to-handle, ready-to-use and at the same time as bioavailable, active forms of otherwise insoluble or sparingly substances. In the case of elemental sulfur, selenium and tellurium, this approach promises wider practical applications, for instance in the medical or agricultural arena. Full article
(This article belongs to the Special Issue Inspired by Nature: Antioxidants and Nanotechnology)
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Review

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Open AccessReview Natural Nanoparticles: A Particular Matter Inspired by Nature
Antioxidants 2018, 7(1), 3; doi:10.3390/antiox7010003
Received: 1 December 2017 / Revised: 20 December 2017 / Accepted: 22 December 2017 / Published: 29 December 2017
Cited by 1 | PDF Full-text (7311 KB) | HTML Full-text | XML Full-text
Abstract
During the last couple of decades, the rapidly advancing field of nanotechnology has produced a wide palette of nanomaterials, most of which are considered as “synthetic” and, among the wider public, are often met with a certain suspicion. Despite the technological sophistication behind
[...] Read more.
During the last couple of decades, the rapidly advancing field of nanotechnology has produced a wide palette of nanomaterials, most of which are considered as “synthetic” and, among the wider public, are often met with a certain suspicion. Despite the technological sophistication behind many of these materials, “nano” does not always equate with “artificial”. Indeed, nature itself is an excellent nanotechnologist. It provides us with a range of fine particles, from inorganic ash, soot, sulfur and mineral particles found in the air or in wells, to sulfur and selenium nanoparticles produced by many bacteria and yeasts. These nanomaterials are entirely natural, and, not surprisingly, there is a growing interest in the development of natural nanoproducts, for instance in the emerging fields of phyto- and phyco-nanotechnology. This review will highlight some of the most recent—and sometimes unexpected—advances in this exciting and diverse field of research and development. Naturally occurring nanomaterials, artificially produced nanomaterials of natural products as well as naturally occurring or produced nanomaterials of natural products all show their own, particular chemical and physical properties, biological activities and promise for applications, especially in the fields of medicine, nutrition, cosmetics and agriculture. In the future, such natural nanoparticles will not only stimulate research and add a greener outlook to a traditionally high-tech field, they will also provide solutions—pardon—suspensions for a range of problems. Here, we may anticipate specific biogenic factories, valuable new materials based on waste, the effective removal of contaminants as part of nano-bioremediation, and the conversion of poorly soluble substances and materials to biologically available forms for practical uses. Full article
(This article belongs to the Special Issue Inspired by Nature: Antioxidants and Nanotechnology)
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