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Algal Biotechnology and Biofuels
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Algal Biotechnology and Biofuels

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A4: Bio-Energy".

Deadline for manuscript submissions: closed (20 April 2021) | Viewed by 13353

Special Issue Editor

Dr. John James Milledge

E-Mail Website
Guest Editor
Faculty of Engineering and Science, Algae Biotechnology Research Group, University of Greenwich, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK
Interests: algae; seaweed; sargassum, biofuel; biogas; biorefinery; anaerobic digestion; nutraceuticals; pharmaceuticals; energy balance; ensilage; food technology; wastewater
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Algae, both macro (seaweed) and micro (phytoplankton), have been a focus for sustainable biofuels research for several years due to their fast growth and cultivation systems that do not compete with agriculture for land and scarce potable water. The challenges of producing energy in an energy-positive and economical manner have led to increasing research on the exploitation of algal biotechnology for a broader range of products in what has been termed an algal biorefinery. However, algae remain an underutilised resource. This Special Edition of Energies titled “Algal Biotechnology and Biofuels” is seeking novel research on the exploitation of algae for fuel and other products, and work on overcoming some of the process challenges and algal biorefining is of special interest.

Dr. John Milledge
Guest Editor

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. Energies 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 2600 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

  • algae
  • seaweed
  • biofuel
  • biogas
  • biorefinery
  • anaerobic digestion
  • fermentation, gasification
  • pyrolysis
  • packaging
  • nutraceuticals
  • pharmaceuticals
  • energy balance
  • ensilage

Published Papers (3 papers)

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Research

14 pages, 3728 KiB  
Article
Australian Strains of Botryococcus braunii Examined for Potential Hydrocarbon and Carotenoid Pigment Production and the Effect of Brackish Water
by Kim Jye Lee-Chang, Elisabeth Albinsson, Lesley Clementson, Andrew T. Revill, Ian Jameson and Susan I. Blackburn
Energies 2020, 13(24), 6644; https://doi.org/10.3390/en13246644 - 16 Dec 2020
Cited by 5 | Viewed by 1921
Abstract
The green alga Botryococcus braunii produces abundant hydrocarbons, in the form of drop-in biodiesel, which promoted interest in the species as a renewable fuel. However, despite the observation of dense populations in the wild, Botryococcus grows very slowly in culture, severely limiting its [...] Read more.
The green alga Botryococcus braunii produces abundant hydrocarbons, in the form of drop-in biodiesel, which promoted interest in the species as a renewable fuel. However, despite the observation of dense populations in the wild, Botryococcus grows very slowly in culture, severely limiting its potential for development as a bioresource. Undertaking a biodiscovery program, we found new strains of Botryococcus in locations ranging from tropical to temperate Australia and from both fresh and brackish waters. As part of the ecophysiological characterisation of this new biodiversity, lipid and pigment compositions were studied for six new strains from six different locations. The strains were inoculated in either freshwater or brackish (salinity of 4)-based medium and maintained over 150 days. The growth of cultures was studied continuously, while lipid and pigment composition were analysed at final harvest on day 150. No significant differences in growth rate between fresh and brackish media were observed. Some strains were more tolerable of brackish conditions than others with a link between salinity tolerance and original location. The use of lower salinity (4 ppt) had a minimal effect on lipid composition, with only two of the six strains showing a different hydrocarbon profile in comparison to the other strains; pigment composition showed only minor variations for fresh and brackish water cultures, although the concentrations varied significantly with the freshwater cultures containing higher pigment concentrations. Full article
(This article belongs to the Special Issue Algal Biotechnology and Biofuels)
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14 pages, 1424 KiB  
Article
Enhanced Light-Induced Biosynthesis of Fatty Acids Suitable for Biodiesel Production by the Yellow-Green Alga Eustigmatos magnus
by Izabela Krzemińska, Artur Nosalewicz, Emilia Reszczyńska and Barbara Pawlik-Skowrońska
Energies 2020, 13(22), 6098; https://doi.org/10.3390/en13226098 - 21 Nov 2020
Cited by 11 | Viewed by 2219
Abstract
Optimization of the fatty acid profile in microalgae is one of the key strategies for obtaining valuable products and sustainable biofuels. Light intensity and light regimes exert an impact on the growth and metabolic process in microalgae. The objective of the present investigations [...] Read more.
Optimization of the fatty acid profile in microalgae is one of the key strategies for obtaining valuable products and sustainable biofuels. Light intensity and light regimes exert an impact on the growth and metabolic process in microalgae. The objective of the present investigations was to assess the effect of light intensity and continuous light vs. photoperiod conditions on the growth and changes in the biomass composition in Eustigmatos magnus, with a focus on bioactive molecules such as lipids and fatty acids. The highest daily productivity of Eustigmatos magnus biomass and lipid yields were detected at continuous illumination and at the highest intensity of light. The results show that the content and composition of fatty acids was influenced by the culture conditions. The biomass of Eustigmatos magnus contained the highest concentrations of polyunsaturated fatty acids in the pphotoperiod conditions with the highest light intensity. This study shows that Eustigmatos magnus has a capacity for the accumulation of palmitoleic acid. A high intensity of continuous light improves the profile of fatty acids in Eustigmatos magnus, which can be suitable for biodiesel applications. At the high intensity of continuous light, Eustigmatos magnus lipids are characterized by high content of oleic acids and low content of saturated and monounsaturated acids. Full article
(This article belongs to the Special Issue Algal Biotechnology and Biofuels)
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27 pages, 2622 KiB  
Article
Sargassum Inundations in Turks and Caicos: Methane Potential and Proximate, Ultimate, Lipid, Amino Acid, Metal and Metalloid Analyses
by John James Milledge, Supattra Maneein, Elena Arribas López and Debbie Bartlett
Energies 2020, 13(6), 1523; https://doi.org/10.3390/en13061523 - 23 Mar 2020
Cited by 63 | Viewed by 8244
Abstract
The Caribbean has been experiencing beach inundations of pelagic Sargassum, causing environmental, health and financial issues. This study showed variations in the composition and methane potential (MP) between the species of Sargassum. The MPs for S. natans VIII, S. natans I and [...] Read more.
The Caribbean has been experiencing beach inundations of pelagic Sargassum, causing environmental, health and financial issues. This study showed variations in the composition and methane potential (MP) between the species of Sargassum. The MPs for S. natans VIII, S. natans I and S. fluitans (145, 66 and 113 mL CH4 g−1 Volatile Solids) were considerably below theoretical potentials, possibly due to the high levels of indigestible fibre and inhibitors. The mixed mats Sargassum composition was substantially different from the individual species, being higher in ash, calcium, iron, arsenic and phenolics. The mixed mats produced no methane, perhaps due to the high levels of phenolics. There was a strong correlation between MP and phenolic content. Heavy metals and metalloids were at levels that should not cause concern, except for arsenic (21–124 mg kg−1 dry weight). Further work on the speciation of arsenic in Sargassum is required to fully determine the risk to health and agriculture. Both protein and lipid levels were low. The ‘indispensable amino acid’ profile compares favourably with that recommended by the World Health Organisation. Lipids had a high proportion of Polyunsaturated Fatty Acids. The use of Sargassum for biogas production could be challenging, and further work is required. Full article
(This article belongs to the Special Issue Algal Biotechnology and Biofuels)
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