New Insights into Microalgae Cultivation and Downstream Processes, 3rd Edition

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Marine Science and Engineering".

Deadline for manuscript submissions: closed (20 February 2024) | Viewed by 299

Special Issue Editor

Special Issue Information

Dear Colleagues,

We are pleased to announce the second edition on this topic. Microalgae and cyanobacteria represent a large taxonomic diversity, making them very suitable for producing valuable and diverse biomolecules (such as pigments, proteins, enzymes, biofuels, polyunsaturated fatty acids, and hydrocolloids). Research on microalgae has been abundantly published and patented in recent years, but the development and commercialization of these metabolites are still in their early stages, and only niche markets are currently available for microalgae products. Their low usage may be easily explained by the costs involved in microalgae production, linked to photoproduction, the harvest of microalgae in diluted media, the recycling of culture media, and the difficulty of refining this biomass. Much effort has been devoted by research groups and companies to improving these processes, limiting microalgae compounds’ applications to the field of high-value products. Some studies are focused on the increase in biomass and bioproducts productivities (new culture system designs, culture strategies, selection of strains, etc.), the use of wastewater to decrease medium costs, and downstream processes (harvesting, fractionation, biorefinery, etc.) in order to achieve a more sustainable and cost-effective production of biomass and bioproducts. The aim of this Special Issue is to provide recent reviews and original research articles highlighting the innovations and dynamism of research in the field of microalgae cultivation and downstream processes.

Dr. Celine Laroche
Guest Editor

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Keywords

  • microalgae
  • photobioreactor
  • culture systems
  • downstream processes
  • biorefinery
  • bioproducts

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16 pages, 1154 KiB  
Article
Indole-3-Acetic Acid Action in Outdoor and Indoor Cultures of Spirulina in Open Raceway Reactors
by Jéssica Teixeira da Silveira, Ana Priscila Centeno da Rosa, Michele Greque de Morais and Jorge Alberto Vieira Costa
Appl. Sci. 2024, 14(9), 3715; https://0-doi-org.brum.beds.ac.uk/10.3390/app14093715 (registering DOI) - 26 Apr 2024
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Abstract
A significant research gap exists in investigating large-scale microalgae cultures exposed to outdoor conditions, with the addition of phytohormones using non-sterile growth media. Implementing these conditions is crucial for verifying the industrial viability of this strategy. This study aimed to evaluate the effect [...] Read more.
A significant research gap exists in investigating large-scale microalgae cultures exposed to outdoor conditions, with the addition of phytohormones using non-sterile growth media. Implementing these conditions is crucial for verifying the industrial viability of this strategy. This study aimed to evaluate the effect of indole-3-acetic acid (IAA) supplementation on Spirulina sp. LEB 18 cultures conducted indoors and outdoors in raceway bioreactors. The outdoor experiments were performed under uncontrolled environmental conditions. The indoor cultures were maintained within a thermostat-controlled chamber at a consistent temperature and lighting intensity. The outdoor experiments supplemented with IAA achieved a biomass concentration of 5.43 g L−1 and productivity of 173.9 mg L−1 d−1. These values increased 122.5% and 130.9% in biomass concentration and productivity, respectively, compared to the indoor experiments with the same supplementation. Moreover, roughly half of the biomass generated from outdoor cultivation with IAA consisted of carbohydrates (45%). Compared to indoor cultivation, this approach reduced production costs for biomass (55%) and lowered production costs for carbohydrates, proteins, and lipids by 86%, 44%, and 50%, respectively. The successful application of phytohormones in microalgae cultures, particularly under larger scale, nonsterile, and outdoor conditions, represents a significant advancement toward industrial implementation. Full article
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