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Special Issue "Algal Cultivation for Obtaining High-Value Products"

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Dr. Cecilia Faraloni
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Guest Editor

Institute of BioEconomy, IBE, National Research Council, Rome, Italy
Interests: carotenoids; polyphenols; antioxidants; microalgae; plants; photosynthesis

Dr. Eleftherios Touloupakis

E-Mail Website
Guest Editor

Research Institute on Terrestrial Ecosystems, National Research Council, Via Madonna del Piano 10, 50019 Sesto Fiorentino, FI, Italy
Interests: microalgae; photosynthesis; photobioreactor; fluorescence; immobilisation; photofermentation
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Special Issue Information

Dear Colleagues,

Interest in the employment of High-Value Products from natural sources for application in human health, the food and cosmetics industry, and animal feed has increased significantly as consumers opt for natural ingredients and show concerns about the toxic effects of synthetic compounds.

Photosynthetic organisms have evolved different strategies to survive under complex and extreme environmental conditions (high light, high salinity, extreme temperature, nutrient deficiency, UV- radiation) by adapting their metabolism.

Various species of algae are capable of producing a large amount of secondary metabolites such as carotenoids, polyphenols and essential oils, which have a wide range of therapeutic properties, due to their antioxidant activity. This peculiarity may depend mainly on the species, strains, genetic diversity and/or abiotic stress. For this reason, numerous studies have been carried out to increase knowledge in this field and to optimize the recovery of natural antioxidant compounds under different growing conditions and with different stress factors. This Special Issue focuses on promoting algae capable of producing High-Value Products, as well as cultivation technologies, strategies and growth conditions that will lead to the popularization of these compounds; techniques for the extraction and purification of these compounds and their potential applications will also be explored.

Dr. Cecilia Faraloni
Dr. Eleftherios Touloupakis
Guest Editors

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Keywords

algae
photosynthesis
antioxidant
stress
carotenoids
polyphenols
physiology
high-value
photobioreactor
biotechnology

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Research

19 pages, 2746 KiB

Open AccessArticle

Description and Characterization of the Odontella aurita OAOSH22, a Marine Diatom Rich in Eicosapentaenoic Acid and Fucoxanthin, Isolated from Osan Harbor, Korea

and

Mar. Drugs 2023, 21(11), 563; https://doi.org/10.3390/md21110563 - 27 Oct 2023

Viewed by 878

Abstract

Third-generation biomass production utilizing microalgae exhibits sustainable and environmentally friendly attributes, along with significant potential as a source of physiologically active compounds. However, the process of screening and localizing strains that are capable of producing high-value-added substances necessitates a significant amount of effort. In the present study, we have successfully isolated the indigenous marine diatom Odontella aurita OAOSH22 from the east coast of Korea. Afterwards, comprehensive analysis was conducted on its morphological, molecular, and biochemical characteristics. In addition, a series of experiments was conducted to analyze the effects of various environmental factors that should be considered during cultivation, such as water temperature, salinity, irradiance, and nutrients (particularly nitrate, silicate, phosphate, and iron). The morphological characteristics of the isolate were observed using optical and electron microscopes, and it exhibited features typical of O. aurita. Additionally, the molecular phylogenetic inference derived from the sequence of the small-subunit 18S rDNA confirmed the classification of the microalgal strain as O. aurita. This isolate has been confirmed to contain 7.1 mg g⁻¹ dry cell weight (DCW) of fucoxanthin, a powerful antioxidant substance. In addition, this isolate contains 11.1 mg g⁻¹ DCW of eicosapentaenoic acid (EPA), which is one of the nutritionally essential polyunsaturated fatty acids. Therefore, this indigenous isolate exhibits significant potential as a valuable source of bioactive substances for various bio-industrial applications. Full article

(This article belongs to the Special Issue Algal Cultivation for Obtaining High-Value Products)

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15 pages, 2360 KiB

Open AccessArticle

Scenedesmus rubescens Heterotrophic Production Strategies for Added Value Biomass

Gonçalo Espírito Santo

and

Mar. Drugs 2023, 21(7), 411; https://doi.org/10.3390/md21070411 - 19 Jul 2023

Viewed by 1046

Abstract

Microalgae attract interest worldwide due to their potential for several applications. Scenedesmus is one of the first in vitro cultured algae due to their rapid growth and handling easiness. Within this genus, cells exhibit a highly resistant wall and propagate both auto- and heterotrophically. The main goal of the present work is to find scalable ways to produce a highly concentrated biomass of Scenedesmus rubescens in heterotrophic conditions. Scenedesmus rubescens growth was improved at the lab-scale by 3.2-fold (from 4.1 to 13 g/L of dry weight) through medium optimization by response surface methodology. Afterwards, scale-up was evaluated in 7 L stirred-tank reactor under fed-batch operation. Then, the optimized medium resulted in an overall productivity of 8.63 g/L/day and a maximum biomass concentration of 69.5 g/L. S. rubescens protein content achieved approximately 31% of dry weight, similar to the protein content of Chlorella vulgaris in heterotrophy. Full article

(This article belongs to the Special Issue Algal Cultivation for Obtaining High-Value Products)

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