Selenium enrichment in the marine microalga Nannochloropsis oceanica

Guimarães, Bárbara O.; Boer, Kieke de; Gremmen, Pieter; Drinkwaard, Anemoon; Wieggers, Rick; Wijffels, René H.; Barbosa, María J.; D’Adamo, Sarah

doi:10.1016/j.algal.2021.102427

Cited by 19 publications

(16 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This reduction in colour might be due to the production of reactive oxygen species (ROS) by Zn or Se, with the consequent release of free radicals that can attack thylakoid lipids damaging the structural pigments of algal cells (Esmaeili, 2015;Petsas & Vagi, 2017;Shi & Dalal, 1990). Furthermore, this might be due to a decrease in the content of magnesium in the chloroplasts, as a consequence of increasing selenium in the medium, although Se did not affect the uptake of other minerals (Guimarães et al, 2021). The algal cell wall is porous and composed of polysaccharides, lipids and proteins, which allow algal cells to absorb metals (Davis et al, 2003;Hope & Walker, 1975).…”

Section: Discussionmentioning

confidence: 99%

“…The toxic effects of selenium on microalgae might be a consequence of: (1) the use of an inorganic form of Se, (2) the Se concentration in the media, (3) and its similarity with Sulphur and in this case, Se can disrupt proteins via substituting Sulphur in Sulphur bonds, resulting in incorrect protein shape and dysfunctional enzymes (Ponce et al, 2018) and ( 4) the specific response of microalgal species (Guimarães et al, 2021). Also, the high levels of Se produces reactive oxygen species (ROS) that stimulate oxidative stress (Lemly, 2002).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Long‐term incorporation of Selenium and Zinc in microalgae Isochrysis galbana and Nannochloropsis oculata and its effects on rotifer

Ahmadifard

Ghaderpour

Agh

et al. 2022

Aquaculture Research

View full text Add to dashboard Cite

Rotifers are widely used in hatcheries to feed small-sized aquatic larvae although one of their disadvantages is the lack of zinc and selenium 5-and 30-fold lower than in copepods, respectively. To improve the rotifers quality, different concentrations of zinc and selenium (2, 4, 5 and 10 mg L −1 of each mineral) were added to the medium of the microalgae Isochrysis aff. galbana and Nannochloropsis oculata for 4 days, and then the microalgae were harvested and concentrated to feed the rotifers. N. oculata accumulated a greater amount of Zn and Se into cells than I. galbana. The cell size of algae given 0, 2, and 4 mg L −1 of minerals did not change in both microalgae, but enrichment of the microalgae with the 5 and 10 mg L −1 decreased the sizes and paled the colour of cells and increased cell division. The 2 mg L −1 was the best group for rotifers in terms of growth (population density, number of eggs, egg ratio, Specific growth rate, the maximum number and doubling time), and contained the second-highest level of Zn (69.26 ± 0.60) and Se (103.5 ± 5.0) content within a safe limit. Thus, rotifers enriched with Se and Zn can be used as a mineral delivery method to cover the nutritional requirements of marine larvae.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Long‐term incorporation of Selenium and Zinc in microalgae Isochrysis galbana and Nannochloropsis oculata and its effects on rotifer

Ahmadifard

Ghaderpour

Agh

et al. 2022

Aquaculture Research

View full text Add to dashboard Cite

show abstract

“…As a reference for the retention time simulation, we selected a tubular photobioreactor with a solar collector loop ( L ) of 300 m and an internal diameter ( d ) of 0.06 m. These are common dimensions for pilot scale tubular photobioreactors, such as the GemTube MK‐1 1500 s tubular photobioreactor (Lgem) located at our AlgaePARC greenhouse facility (Bennekom, the Netherlands), described elsewhere (Guimarães et al, 2021). In this study, three different HRT were simulated for such reactor: short, medium, and long.…”

Section: Methodsmentioning

confidence: 99%

Scale‐down of oxygen and glucose fluctuations in a tubular photobioreactor operated under oxygen‐balanced mixotrophy

Fernández

García

Jansen

et al. 2023

Biotech & Bioengineering

View full text Add to dashboard Cite

Oxygen-balanced mixotrophy (OBM) is a novel type of microalgal cultivation that improves autotrophic productivity while reducing aeration costs and achieving high biomass yields on substrate. The scale-up of this process is not straightforward, as nonideal mixing in large photobioreactors might have unwanted effects in cell physiology. We simulated at lab scale dissolved oxygen and glucose fluctuations in a tubular photobioreactor operated under OBM where glucose is injected at the beginning of the tubular section. We ran repeated batch experiments with the strain Galdieria sulphuraria ACUF 064 under glucose pulse feeding of different lengths, representing different retention times: 112, 71, and 21 min. During the long and medium tube retention time simulations, dissolved oxygen was depleted 15-25 min after every glucose pulse. These periods of oxygen limitation resulted in the accumulation of coproporphyrin III in the supernatant, an indication of disruption in the chlorophyll synthesis pathway. Accordingly, the absorption cross-section of the cultures decreased steeply, going from values of 150-180 m 2 kg −1 at the end of the first batch down to 50-70 m 2 kg −1 in the last batches of both conditions. In the short tube retention time simulation, dissolved oxygen always stayed above 10% air saturation and no pigment reduction nor coproporphyrin III accumulation were observed. Concerning glucose utilization efficiency, glucose pulse feeding caused a reduction of biomass yield on substrate in the range of 4%-22% compared to the maximum levels previously obtained with continuous glucose feeding (0.9 C-g C-g −1 ).The missing carbon was excreted to the supernatant as extracellular polymeric substances constituted by carbohydrates and proteins. Overall, the results point out the importance of studying large-scale conditions in a controlled environment and the need for a highly controlled glucose feeding strategy in the scale-up of mixotrophic cultivation.

show abstract

“…Only a few terrestrial plants (e.g., Brazil nuts, cereal grains, soybeans) can produce this compound, although its concentration in these plants is rather low [33]. Several marine microalgae species, such as Nannochloropsis oceanica [34] and Chlorella sp. [35], can accumulate a high concentration of selenomethionine.…”

Section: Amino Acidsmentioning

confidence: 99%

The Potential of Marine Microalgae for the Production of Food, Feed, and Fuel (3F)

et al. 2022

View full text Add to dashboard Cite

Whole-cell microalgae biomass and their specific metabolites are excellent sources of renewable and alternative feedstock for various products. In most cases, the content and quality of whole-cell biomass or specific microalgal metabolites could be produced by both fresh and marine microalgae strains. However, a large water footprint for freshwater microalgae strain is a big concern, especially if the biomass is intended for non-food applications. Therefore, if any marine microalgae could produce biomass of desired quality, it would have a competitive edge over freshwater microalgae. Apart from biofuels, recently, microalgal biomass has gained considerable attention as food ingredients for both humans and animals and feedstock for different bulk chemicals. In this regard, several technologies are being developed to utilize marine microalgae in the production of food, feed, and biofuels. Nevertheless, the production of suitable and cheap biomass feedstock using marine microalgae has faced several challenges associated with cultivation and downstream processing. This review will explore the potential pathways, associated challenges, and future directions of developing marine microalgae biomass-based food, feed, and fuels (3F).

show abstract

Selenium enrichment in the marine microalga Nannochloropsis oceanica

Cited by 19 publications

References 35 publications

Long‐term incorporation of Selenium and Zinc in microalgae Isochrysis galbana and Nannochloropsis oculata and its effects on rotifer

Long‐term incorporation of Selenium and Zinc in microalgae Isochrysis galbana and Nannochloropsis oculata and its effects on rotifer

Scale‐down of oxygen and glucose fluctuations in a tubular photobioreactor operated under oxygen‐balanced mixotrophy

The Potential of Marine Microalgae for the Production of Food, Feed, and Fuel (3F)

Contact Info

Product

Resources

About