Extracellular Polymeric Substances (EPS) as Microalgal Bioproducts: A Review of Factors Affecting EPS Synthesis and Application in Flocculation Processes

Babiak, Wioleta; Krzemińska, Izabela

doi:10.3390/en14134007

Cited by 80 publications

(34 citation statements)

References 134 publications

(271 reference statements)

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“…We assumed that the higher BCMA/MA ratio was due to the accumulation of nutrient content from microalgae biomass and liquid media. Such a similar result compared with the previous report argued that the liquid culture of Dictyosphaerium chlorelloides in Zehnder medium showed the nitrogen, phosphorus, potassium, and magnesium content were 8.68, 5.76, 2.88, and 0.46 fold higher than its biomass content, respectively (Babiak & Krzemińska, 2021;Kumar et al, 2017).…”

Section: Macronutrient Characteristics Of Microalgae Biomass and Liqu...supporting

confidence: 89%

Exploring The Potency of Microalgae-Based Biofertilizer and Its Impact on Oil Palm Seedlings Growth

et al. 2022

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Indonesia is a major producer of palm oil. Consequently, the use of chemical fertilizers has become more extensive. Microalgae represent a potential alternative for enhancing and protecting crops based on their cell elements. This study applies dry biomass or liquid culture formulation of the green microalgae Haematococcus pluvialis to the rhizosphere of oil palm pre-nursery as a biofertilizer. Soil application of microalgae biomass of 0.5 g/l (MA) or liquid culture of 10% (v/v) (BCMA) is carried out to assess its effects on 4-months-old oil palm at the nursery stage. The compatibility test between microalgae and bio fungicide agents in agricultural practices, Trichoderma spp., is also tested on both microalgae formulations. The result shows that both microalgae biomass and liquid culture, alone or combined with Trichoderma spp., give a better growth performance to the oil palm. The application of MA and BCMA result in a maximum increment of plant height, leaves count, and chlorophyll content. Furthermore, the application of BCMA gives better oil palm growth performance, which may probably be influenced by the accessibility of nutrients for microalgae growth. The study reveals that soil application of microalgae as biofertilizers can improve oil palm growth performance.

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Section: Macronutrient Characteristics Of Microalgae Biomass and Liqu...supporting

confidence: 89%

Exploring The Potency of Microalgae-Based Biofertilizer and Its Impact on Oil Palm Seedlings Growth

et al. 2022

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“…In fact, previous studies aiming to optimise the medium composition in order to increase EPS production highlight the role of sodium nitrate. It has been reported that increasing nitrogen concentration results in elevated EPS production (reviewed in [ 64 , 65 ]), although this is not consensual, and some authors have observed opposing effects [ 66 ]. Further studies need to be carried out in order to fully understand the intricate relationship between microalgae communities (including associated bacteria), nitrogen usage and response to challenging environmental conditions.…”

Section: Discussionmentioning

confidence: 99%

Optimal Nitrate Supplementation in Phaeodactylum tricornutum Culture Medium Increases Biomass and Fucoxanthin Production

Afonso

Bragança

Rebelo

et al. 2022

Foods

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Phaeodactylum tricornutum is a model diatom with numerous potential applications in the industry, including the production of high-value carotenoid pigments such as fucoxanthin. This compound is a potent antioxidant currently extracted mainly from brown macroalgae. Fucoxanthin exhibits several biological properties with well-known beneficial effects in the treatment and prevention of lifestyle-related diseases. P. tricornutum offers a valuable alternative to macroalgae for fucoxanthin production as it has a specific productivity that is 10-fold higher as compared with macroalgae. However, production processes still need to be optimised to become a cost-effective alternative. In this work, we investigated the optimal supplementation of nitrate in a cultivation medium that is currently used for P. tricornutum and how this nitrate concentration affects cell growth and fucoxanthin production. It has previously been shown that the addition of sodium nitrate increases productivity, but optimal conditions were not accurately determined. In this report, we observed that the continuous increase in nitrate concentration did not lead to an increase in biomass and fucoxanthin content, but there was rather a window of optimal values of nitrate that led to maximum growth and pigment production. These results are discussed considering both the scale up for industrial production and the profitability of the process, as well as the implications in the cell’s metabolism and effects in fucoxanthin production.

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“…The use of autoflocculating microalgae to induce flocculation of non-flocculating species is considered one of the most promising methods in bioflocculation [21]. EPS can create a viscous coating around cells [12].…”

Section: Potentiality Of Microalgal Polysaccharides In Bioflocculationmentioning

confidence: 99%

“…EPS represent carbon and energy reserves for cells and are often excreted by microalgae as part of physiological processes or under stress conditions [12,21,[26][27][28], such as light intensity and light continuity, temperature [29,30], pH [31,32], excess, limitation or absence of nutrients, such as carbon, nitrogen, phosphorus, sulfur, sodium, potassium, iron, magnesium and calcium [14,33,34], and toxic substances [35,36], such as cadmium [37], copper, lead, chromium, nickel [31,38], and silver [39].…”

Section: Potentiality Of Microalgal Polysaccharides In Bioflocculationmentioning

confidence: 99%

Recent Advances of Microalgae Exopolysaccharides for Application as Bioflocculants

et al. 2022

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Microalgae are used in flocculation processes because biopolymers are released into the culture medium. Microalgal cell growth under specific conditions (temperature, pH, luminosity, nutrients, and salinity) provides the production and release of exopolysaccharides (EPS). These biopolymers can be recovered from the medium for application as bioflocculants or used directly in cultivation as microalgae autoflocculants. The optimization of nutritional parameters, the control of process conditions, and the possibility of scaling up allow the production and industrial application of microalgal EPS. Therefore, this review addresses the potential use of EPS produced by microalgae in bioflocculation. The recovery, determination, and quantification techniques for these biopolymers are also addressed. Moreover, other technological applications of EPS are highlighted.

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Extracellular Polymeric Substances (EPS) as Microalgal Bioproducts: A Review of Factors Affecting EPS Synthesis and Application in Flocculation Processes

Cited by 80 publications

References 134 publications

Exploring The Potency of Microalgae-Based Biofertilizer and Its Impact on Oil Palm Seedlings Growth

Exploring The Potency of Microalgae-Based Biofertilizer and Its Impact on Oil Palm Seedlings Growth

Optimal Nitrate Supplementation in Phaeodactylum tricornutum Culture Medium Increases Biomass and Fucoxanthin Production

Recent Advances of Microalgae Exopolysaccharides for Application as Bioflocculants

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