Special Issue "Biomolecules from Alga: Biological Effect and Pharmacological Properties Volume 2"

A special issue of Biomolecules (ISSN 2218-273X). This special issue belongs to the section "Natural and Bio-inspired Molecules".

Deadline for manuscript submissions: 20 December 2022 | Viewed by 661

Special Issue Editor

Special Issue Information

Dear Colleagues,

Algae are mainly composed of proteins, carbohydrates, lipids, and trace nutrients including vitamins, antioxidants, and other elements. These photoautotrophic organisms include eukaryotes (macro- and microalgae) and prokaryotic Cyanobacteria (also called blue-green microalgae) living in various aquatic but also nonaquatic habitats. Algae have the potential to play pivotal roles in remedying the prevailing global energy, environment, and food crisis. Indeed, bioactive compounds from algae such as proteins, fatty acids, carbohydrates, vitamins, and pigments can be sourced directly from their primary or secondary metabolism. Many of these compounds have been described as having antifungal, antiviral, antialgal, antienzymatic, antibiotic, antimicrobial, antioxidant, and anti-inflammatory capacities, with great potential for the development of new products for medical, pharmaceutical, cosmetic, and food industries. This Special Issue encompasses the roles of alga in biomolecule production, including screening of extracts or isolation of new metabolites and assessment of their biological activity.

Prof. Dr. Philippe Michaud
Guest Editor

Manuscript Submission Information

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Keywords

  • seaweed
  • microalgae
  • cyanobacteria
  • blue biotechnology
  • algae
  • bioactive compounds

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Published Papers (2 papers)

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Research

Article
Improvement of Biomass and Phycoerythrin Production by a Strain of Rhodomonas sp. Isolated from the Tunisian Coast of Sidi Mansour
Biomolecules 2022, 12(7), 885; https://doi.org/10.3390/biom12070885 - 24 Jun 2022
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Abstract
Microalgae are photoautotrophic microorganisms known as producers of a large variety of metabolites. The taxonomic diversity of these microorganisms has been poorly explored. In this study, a newly isolated strain was identified based on the 18S rRNA encoding gene. The phylogenetic analysis showed [...] Read more.
Microalgae are photoautotrophic microorganisms known as producers of a large variety of metabolites. The taxonomic diversity of these microorganisms has been poorly explored. In this study, a newly isolated strain was identified based on the 18S rRNA encoding gene. The phylogenetic analysis showed that the isolated strain was affiliated with the Rhodomonas genus. This genus has greatly attracted scientific attention according to its capacity to produce a large variety of metabolites, including phycoerythrin. Growth and phycoerythrin production conditions were optimized using a Plackett–Burman design and response surface methodology. An expression profile analysis of the cpeB gene, encoding the beta subunit of phycoerythrin, was performed by qRT-PCR under standard and optimized culture conditions. The optimization process showed that maximum cell abundance was achieved under the following conditions: CaCl2 = 2.1328 g/L, metal solution = 1 mL/L, pH = 7 and light intensity = 145 μmol photons/m2/s, whereas maximum phycoerythrin production level occurred when CaCl2 = 1.8467 g/L, metal solution = 1 mL/L, pH = 7 and light intensity = 157 μmol/m2/s. In agreement, positive transcriptional regulation of the cpeB gene was demonstrated using qRT-PCR. This study showed the successful optimization of abiotic conditions for highest growth and phycoerythrin production, making Rhodomonas sp. suitable for several biotechnological applications. Full article
Article
Influence of Carbon Sources on the Phenolic Compound Production by Euglena gracilis Using an Untargeted Metabolomic Approach
Biomolecules 2022, 12(6), 795; https://doi.org/10.3390/biom12060795 - 07 Jun 2022
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Abstract
Industrial development and urbanization has led to the diverse presence of metals in wastewater that are often improperly treated. The microalgae Euglena gracilis can tolerate high concentrations of metal via the excretion of organic metabolites, including phenolics. This study aims to evaluate how [...] Read more.
Industrial development and urbanization has led to the diverse presence of metals in wastewater that are often improperly treated. The microalgae Euglena gracilis can tolerate high concentrations of metal via the excretion of organic metabolites, including phenolics. This study aims to evaluate how carbon amendment stimulates phenolic compound production by E. gracilis. The number, relative intensity and molecular composition of the phenolic compounds were significantly different between each of four carbon amended cultures (i.e., glutamic acid, malic acid, glucose, reduced glutathione) during the log phase. Phenolic compounds were mainly produced during the minimum growth rate, likely a response to stressful conditions. A better understanding of phenolic compounds production by E. gracilis and the impact of growth conditions will help identify conditions that favor certain phenolic compounds for dietary and metal chelation applications. Full article
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