Adhesion of algal cells to surfaces

Özkan, Aysun; Berberoğlu, Halil

doi:10.1080/08927014.2013.782397

Cited by 91 publications

(70 citation statements)

References 46 publications

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“…A major group of inhabitants in the initial biofilm formed under conditions where light is present, phototrophic biofilms, are cyanobacteria and microalgae [12,14]. There are many practical issues arising from phototrophic biofilm formation, including problems with biofouling on technical surfaces such as ship hulls and lowered light transmittance in photobioreactors [7,14].…”

Section: Introductionmentioning

confidence: 99%

Biofilm Formation by Chlorella vulgaris is Affected by Light Quality

et al. 2014

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Formation of biofilm on surfaces is a common feature in aquatic environments. Major groups of inhabitants in conditions where light is present are photoautotrophic microorganisms, such as cyanobacteria and microalgae. This study examined the effect of light quality on growth and biofilm formation of the microalgal species Chlorella vulgaris. Dense biofilm formation and aggregated growth of cells were observed in treatments exposed to blue, purple and white light. Less dense biofilm formation and solitary growth of cells were observed in treatments exposed to red, yellow or green light. Microalgal biofilms are of high importance in many respects, not least from an economic perspective. One example is the intense efforts undertaken to control biofilm formation on technical surfaces such as ship hulls. The present study suggests that light quality plays a role in biofilm formation and that blue-light receptors may be involved.

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Section: Introductionmentioning

confidence: 99%

Biofilm Formation by Chlorella vulgaris is Affected by Light Quality

et al. 2014

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“…First, the surface free energy determines the formation and development of microalgal biofilms. 5,6 While cultivating in a photobioreactor, microalgal cells tend to form highly productive biofilms over solid surfaces. This microalgal biofouling can significantly lower the performance of the photobioreactor and hinder cell proliferation in the culture medium.…”

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confidence: 99%

Rapid Spectrophotometric Method for Determining Surface Free Energy of Microalgal Cells

Zhang

Jiang

et al. 2014

Anal. Chem.

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Microalgae are one of the most promising renewable energy sources with environmental sustainability. The surface free energy of microalgal cells determines their biofouling and bioflocculation behavior and hence plays an important role in microalgae cultivation and harvesting. To date, the surface energetic properties of microalgal cells are still rarely studied. We developed a novel spectrophotometric method for directly determining the surface free energy of microalgal cells. The principles of this method are based on analyzing colloidal stability of microalgae suspensions. We have shown that this method can effectively differentiate the surface free energy of four microalgal strains, i.e., marine Chlorella sp., marine Nannochloris oculata, freshwater autotrophic Chlorella sp., and freshwater heterotrophic Chlorella sp. With advantages of high-throughput and simplicity, this new spectrophotometric method has the potential to evolve into a standard method for measuring the surface free energy of cells and abiotic particles.

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“…This phenomenon is responsible for lower biomass productivities, since the amount of light (the energetic source required for photosynthesis) that effectively penetrates into microalgal suspension is significantly reduced [16][17][18]. On the other hand, several authors have reported the growth of microalgae in biofilms.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, several authors have reported the growth of microalgae in biofilms. These immobilized growth systems facilitate further harvesting processes [7,16,19,20]. For both promotion and control of microalgal attachment, knowledge about surface physicochemical properties is essential [16,21,22].…”

Section: Introductionmentioning

confidence: 99%

Surface physicochemical properties of selected single and mixed cultures of microalgae and cyanobacteria and their relationship with sedimentation kinetics

Gonçalves

Ferreira

Loureiro

et al. 2015

Bioresour. Bioprocess.

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Background: Microalgae are photosynthetic microorganisms presenting a diversity of biotechnological applications. However, microalgal cultivation systems are not energetically and economically feasible. Possible strategies that can be applied to improve the feasibility of microalgal production include biofouling control in photobioreactors, the use of attached growth systems and bioflocculation. These processes are ruled by surface physicochemical properties. Accordingly, the surface physicochemical properties of Chlorella vulgaris, Pseudokirchneriella subcapitata, Synechocystis salina and Microcystis aeruginosa were determined through contact angle and zeta potential measurements. Additionally, mixed cultures of the selected microorganisms were performed. Sedimentation kinetics of the studied cultures was also evaluated to understand how surface physicochemical properties influence microalgal recovery. Results: All studied microorganisms, except S. salina, presented a hydrophilic surface. The co-culture of S. salina with the other studied microorganisms resulted in a more hydrophobic algal suspension. Regarding zeta potential determinations, all studied suspensions presented a negatively charged surface (approximately -40.8 ± 4.4 mV). Sedimentation experiments have shown that all microalgal suspensions presented low microalgal recovery efficiencies. However, a negative linear relationship between microalgal removal percentage and free energy of hydrophobic interaction was obtained. Conclusions:The evidence of a relationship between microalgal removal percentage and free energy of hydrophobic interaction demonstrates the importance of surface physicochemical properties on microalgal settling. However, the low recovery efficiencies achieved, as well as the high net zeta potential values determined, indicate that another factor to consider in microalgal settling is the ionic strength of the culture medium, which play an important role in suspensions' stability.

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Adhesion of algal cells to surfaces

Cited by 91 publications

References 46 publications

Biofilm Formation by Chlorella vulgaris is Affected by Light Quality

Biofilm Formation by Chlorella vulgaris is Affected by Light Quality

Rapid Spectrophotometric Method for Determining Surface Free Energy of Microalgal Cells

Surface physicochemical properties of selected single and mixed cultures of microalgae and cyanobacteria and their relationship with sedimentation kinetics

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