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Reactions
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Biotechnological Conversion of Carbon-Rich Waste Streams to High Added-Value Products
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Biotechnological Conversion of Carbon-Rich Waste Streams to High Added-Value Products

A special issue of Reactions (ISSN 2624-781X).

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 8348

Special Issue Editors

Dr. Leonidas Matsakas

E-Mail Website
Guest Editor
Division of Chemical Engineering, Department of Civil, Environmental and Natural Resources, Luleå University of Technology, 971 87 Luleå, Sweden
Interests: biomass pretreatment and fractionation; organosolv; bioenergy; biofuels; biomaterials; heterotrophic growth of algae; production of nutraceutical compounds; lignin valorization; enzymatic processes
Special Issues, Collections and Topics in MDPI journals
Dr. Alok Kumar Patel

E-Mail Website
Guest Editor
Biochemical Process Engineering, Division of Chemical Engineering, Department of Civil, Environmental, and Natural Resource Engineering, Luleå University of Technology, 97187 Luleå, Sweden
Interests: bioprocess development; metabolic engineering; biomass pretreatment; oleaginous microorganisms; nutraceuticals and value-added products from microalgae; renewable energy; biomass production; biofuels; waste volarization
Special Issues, Collections and Topics in MDPI journals
Dr. Io Antonopoulou

E-Mail Website
Guest Editor
Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, C148 Lulea, Sweden
Interests: enzymatic hydrolysis; lignocellulosic biomass; cellulose; biomass modification; enzymatic transesterification; ferulic acid

Special Issue Information

Dear Colleagues,

Over the past few years, strategies towards the reduction of greenhouse gas emissions have been widely discussed, driven by the need to combat climate change. Biotechnological processes hold great promise for the future by utilizing renewable resources and have a potential to save energy and significantly reduce CO2 emissions. Bio-based products can be a sustainable and green alternative solution to energy and resource intensive fossil-based products.

This Special Issue will be focused on the biotechnological valorization of carbon-rich waste streams to high-added value products. By employing microorganisms such as bacteria, yeast and fungi and/or novel enzymes it is possible to convert residual streams to a large portfolio of products, such as organic acids, biofuels, biopolymers, bioelectricity and bioactive molecules with potential for application in the food, cosmetics and pharmaceutical industry. This issue invites original contributions and review papers from authors to demonstrate the most recent advancements on the valorization of different carbon-rich waste streams, such as lignocellulose agricultural and forest residues, industrial and urban organic waste and CO2-rich industrial gas streams. Special attention will be given to reaction kinetics, reaction screening and optimization and development of novel bioconversion reactions and methodologies.

Dr. Leonidas Matsakas
Dr. Alok Patel
Dr. Io Antonopoulou
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. Reactions 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

  • Microbial conversion
  • Enzymatic processes
  • Biocatalysis and bioconversion
  • Waste valorization
  • Agricultural and forest residues
  • CO2-rich industrial waste streams
  • Biofuels and chemicals
  • Food additives, pharmaceuticals and nutraceuticals
  • Biopolymers
  • Bioelectricity

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Published Papers (2 papers)

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Research

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15 pages, 1490 KiB  
Article
Bioconversions of Biodiesel-Derived Glycerol into Sugar Alcohols by Newly Isolated Wild-Type Yarrowia lipolytica Strains
by Eleni-Stavroula Vastaroucha, Sofia Maina, Savvoula Michou, Ourania Kalantzi, Chrysanthi Pateraki, Apostolis A. Koutinas and Seraphim Papanikolaou
Reactions 2021, 2(4), 499-513; https://doi.org/10.3390/reactions2040032 - 12 Dec 2021
Cited by 9 | Viewed by 2754
Abstract
The utilization of crude glycerol, generated as a by-product from the biodiesel production process, for the production of high value-added products represents an opportunity to overcome the negative impact of low glycerol prices in the biodiesel industry. In this study, the biochemical behavior [...] Read more.
The utilization of crude glycerol, generated as a by-product from the biodiesel production process, for the production of high value-added products represents an opportunity to overcome the negative impact of low glycerol prices in the biodiesel industry. In this study, the biochemical behavior of Yarrowia lipolytica strains FMCC Y-74 and FMCC Y-75 was investigated using glycerol as a carbon source. Initially, the effect of pH value (3.0–7.0) was examined to produce polyols, intracellular lipids, and polysaccharides. At low pH values (initial pH 3.0–5.0), significant mannitol production was recorded. The highest mannitol production (19.64 g L−1) was obtained by Y. lipolytica FMCC Y-74 at pH = 3.0. At pH values ranging between 5.0 and 6.0, intracellular polysaccharides synthesis was favored, while polyols production was suppressed. Subsequently, the effect of crude glycerol and its concentration on polyols production was studied. Y. lipolytica FMCC Y-74 showed high tolerance to impurities of crude glycerol. Initial substrate concentrations influence polyols production and distribution with a metabolic shift toward erythritol production being observed when the initial glycerol concentration (Gly0) increased. The highest total polyols production (=56.64 g L−1) was obtained at Gly0 adjusted to ≈120 g L−1. The highest polyols conversion yield (0.59 g g−1) and productivity (4.36 g L−1 d−1) were reached at Gly0 = 80 g L−1. In fed-batch intermittent fermentation with glycerol concentration remaining ≤60 g L−1, the metabolism was shifted toward mannitol biosynthesis, which was the main polyol produced in significant quantities (=36.84 g L−1) with a corresponding conversion yield of 0.51 g g−1. Full article
(This article belongs to the Special Issue Biotechnological Conversion of Carbon-Rich Waste Streams to High Added-Value Products)
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Review

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17 pages, 758 KiB  
Review
Impacts of Syngas Composition on Anaerobic Fermentation
by Carolina Benevenuti, Priscilla Amaral, Tatiana Ferreira and Peter Seidl
Reactions 2021, 2(4), 391-407; https://doi.org/10.3390/reactions2040025 - 3 Oct 2021
Cited by 22 | Viewed by 4387
Abstract
Energy consumption places growing demands on modern lifestyles, which have direct impacts on the world’s natural environment. To attain the levels of sustainability required to avoid further consequences of changes in the climate, alternatives for sustainable production not only of energy but also [...] Read more.
Energy consumption places growing demands on modern lifestyles, which have direct impacts on the world’s natural environment. To attain the levels of sustainability required to avoid further consequences of changes in the climate, alternatives for sustainable production not only of energy but also materials and chemicals must be pursued. In this respect, syngas fermentation has recently attracted much attention, particularly from industries responsible for high levels of greenhouse gas emissions. Syngas can be obtained by thermochemical conversion of biomass, animal waste, coal, municipal solid wastes and other carbonaceous materials, and its composition depends on biomass properties and gasification conditions. It is defined as a gaseous mixture of CO and H2 but, depending on those parameters, it can also contain CO2, CH4 and secondary components, such as tar, oxygen and nitrogenous compounds. Even so, raw syngas can be used by anaerobic bacteria to produce biofuels (ethanol, butanol, etc.) and biochemicals (acetic acid, butyric acid, etc.). This review updates recent work on the influence of biomass properties and gasification parameters on syngas composition and details the influence of these secondary components and CO/H2 molar ratio on microbial metabolism and product formation. Moreover, the main challenges, opportunities and current developments in syngas fermentation are highlighted in this review. Full article
(This article belongs to the Special Issue Biotechnological Conversion of Carbon-Rich Waste Streams to High Added-Value Products)
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