Mechanism behind autoflocculation of unicellular green microalgae Ettlia texensis

Salim, S.; Kosterink, N.R.; Wacka, N.D. Tchetkoua; Vermuë, M.H.; Wijffels, René H.

doi:10.1016/j.jbiotec.2014.01.026

Cited by 120 publications

(52 citation statements)

References 12 publications

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“…A flocculation efficiency of over 90% and the formation of large‐sized flocs without a significant change in the zeta potential were observed during the stationary phase of Ettlia texensis (Salim et al, ). The formation mechanism of large microalgal flocs has also been related to EPS on the cell surface rather than neutralization of the zeta potential (Salim et al, ). In the case of the Ettlia sp.…”

Section: Resultsmentioning

confidence: 99%

Simple processes for optimized growth and harvest of Ettlia sp. by pH control using CO₂ and light irradiation

Yoo

Kim

et al. 2014

Biotech & Bioengineering

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Microalgae cultures show wide range of pH depending on the availability of light and CO2 for their strain specific photosynthesis. Thus, the modulation of light irradiation and CO2 supply can be applied for the pH control of microalgae cultures. The optimal pH of Ettlia sp. YC001, for phototrophic growth and auto-flocculation was investigated by controlling light irradiation and 10% CO2 supply. Ettlia sp. YC001 showed the highest biomass productivity, 96.7 mg L(-1) d(-1) , at pH 8.5. The flocculating activity of Ettlia sp. YC001 showed a sigmoid pattern with pH increase and was above 70% at pH 10.5. Based on these differentiated optimal pH regimes for the growth and flocculation, an integrated process consisting of cultivation and settling vessels was proposed. The integrated process demonstrated that high flocculation activity of Ettlia sp. YC001 could be achieved in the settling vessel with various hydraulic retention times by only irradiation of light to maintain high pH while maintaining the optimal growth in cultivation vessel with the light irradiation and CO2 supply at pH 8.5. Thus, the proposed strategy for pH control would provide a simple, cost-effective, and flexible design and operation for microalgae cultivation-harvest systems.

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Section: Resultsmentioning

confidence: 99%

Simple processes for optimized growth and harvest of Ettlia sp. by pH control using CO₂ and light irradiation

Yoo

Kim

et al. 2014

Biotech & Bioengineering

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“…The detailed biochemical analysis revealed the presence of polysaccharides that facilitated the cells aggregation in both microalgae. According to another report, the flocculation of self‐flocculating microalgae E. texensis is induced by glycoproteins present on the cell surface . The microalgal cells produce these flocculating agents that facilitate patching or bridging between cells to promote aggregation through surface charge neutralization.…”

Section: Genetic Engineering To Induce Self‐flocculation In Microalgaementioning

confidence: 99%

Microalgal flocculation: Global research progress and prospects for algal biorefinery

Malik

Khan

Atta

et al. 2019

Biotech and App Biochem

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Microalgal research has made significant progress due to versatile and high‐value industrial applications of microalgal biomass or its derivatives. However, to explore their full potential and to achieve commercial robustness, microalgal biorefinery needs cost‐effective technologies to produce, harvest, and process the microalgal biomass on large scale as higher production and harvesting cost is one of the key hindrances in the commercialization of algae‐based products. Among several other algal biomass harvesting technologies, self‐flocculation seems to be an attractive, low‐cost, and eco‐friendly harvesting technology. This review covers various flocculation‐based methods that have been employed to harvest microalgal biomass with a special emphasis on self‐flocculation in microalgae. Moreover, genetic engineering approaches to induce self‐flocculation in non‐flocculating microalgae along with the factors affecting self‐flocculation and recent research trends have also been discussed. It is concluded that self‐flocculation is the most desired approach for the energy‐ and environment‐efficient harvesting of microalgal biomass. However, its poorly understood genetic basis needs to be deciphered through detailed studies to harness its potential for the algal biorefinery.

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“…Current harvesting technologies applied include chemical, electrical, mechanical and biological based methods. In particular, cell flocculation technology to recover biomass from microalgae is becoming of great interest due to its capacity for treating large amounts of biomass with low energy cost [76,77]. In this context, bio-flocculation and auto-flocculation as novel flocculation based methods are highlighted among others, as it could be shown recently.…”

Section: Downstream Processingmentioning

confidence: 99%

Utilization of Volatile Fatty Acids from Microalgae for the Production of High Added Value Compounds

et al. 2017

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Volatile Fatty Acids (VFA) are small organic compounds that have attracted much attention lately, due to their use as a carbon source for microorganisms involved in the production of bioactive compounds, biodegradable materials and energy. Low cost production of VFA from different types of waste streams can occur via dark fermentation, offering a promising approach for the production of biofuels and biochemicals with simultaneous reduction of waste volume. VFA can be subsequently utilized in fermentation processes and efficiently transformed into bioactive compounds that can be used in the food and nutraceutical industry for the development of functional foods with scientifically sustained claims. Microalgae are oleaginous microorganisms that are able to grow in heterotrophic cultures supported by VFA as a carbon source and accumulate high amounts of valuable products, such as omega-3 fatty acids and exopolysaccharides. This article reviews the different types of waste streams in concert with their potential to produce VFA, the possible factors that affect the VFA production process and the utilization of the resulting VFA in microalgae fermentation processes. The biology of VFA utilization, the potential products and the downstream processes are discussed in detail.

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Mechanism behind autoflocculation of unicellular green microalgae Ettlia texensis

Cited by 120 publications

References 12 publications

Simple processes for optimized growth and harvest of Ettlia sp. by pH control using CO₂ and light irradiation

Simple processes for optimized growth and harvest of Ettlia sp. by pH control using CO₂ and light irradiation

Microalgal flocculation: Global research progress and prospects for algal biorefinery

Utilization of Volatile Fatty Acids from Microalgae for the Production of High Added Value Compounds

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Mechanism behind autoflocculation of unicellular green microalgae Ettlia texensis

Cited by 120 publications

References 12 publications

Simple processes for optimized growth and harvest of Ettlia sp. by pH control using CO2 and light irradiation

Simple processes for optimized growth and harvest of Ettlia sp. by pH control using CO2 and light irradiation

Microalgal flocculation: Global research progress and prospects for algal biorefinery

Utilization of Volatile Fatty Acids from Microalgae for the Production of High Added Value Compounds

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Product

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Simple processes for optimized growth and harvest of Ettlia sp. by pH control using CO₂ and light irradiation

Simple processes for optimized growth and harvest of Ettlia sp. by pH control using CO₂ and light irradiation