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Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...

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Cultivation of Green Microalgae in Bubble Column Photobioreactors and an Assay for Neutral Lipids

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Microalgae as Soft Permeable Particles.

Paula Araujo Gomes^1,2,3, Jean-Baptiste d'Espinose de Lacaillerie^1,2, Bruno Lartiges⁴

¹Soft Matter Sciences and Engineering Laboratory, ESPCI Paris, Université PSL, Sorbonne Université, Centre National de la Recherche Scientifique, UMR 7615, 10 Rue Vauquelin, F-75005Paris, France.

Langmuir : the ACS Journal of Surfaces and Colloids

|November 7, 2022

Summary

Microalgae surface charge and interfacial properties were analyzed using soft particle theory. This research reveals insights into microalgae

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Area of Science:

Colloid and Surface Science
Biophysics
Microalgal Biotechnology

Background:

Colloidal stability of microalgae is crucial for their distribution and harvesting.
Understanding microalgal interfacial properties is key to managing their concentrations in aquatic environments.

Purpose of the Study:

To investigate the surface charges and electrokinetic behavior of three unicellular microalgae species.
To apply Ohshima's soft particle theory to characterize microalgal surface properties.

Main Methods:

Electrophoretic mobility measurements of *Chlorella vulgaris*, *Nannochloropsis oculata*, and *Tetraselmis suecica*.
Modeling electrokinetic properties using Ohshima's soft particle theory.
Comparison with transmission electron microscopy (TEM) of algal cell surfaces.

Main Results:

All three microalgae species exhibited electrokinetic behavior consistent with soft particles.
Characteristic parameters of the microalgal polyelectrolyte layer, including volume charge density and hydrodynamic penetration length, were estimated.
Estimated surface potentials were less negative than apparent zeta potentials, suggesting a reduced role for electrostatics.

Conclusions:

Microalgae surface properties can be accurately described by soft particle theory.
The extracellular polymeric layer significantly influences microalgal electrokinetic behavior.
Electrostatic interactions may play a less dominant role in microalgal aggregation and adhesion than previously thought.