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Cultivation of Scenedesmus obliquus in Photobioreactors: Effects of Light Intensities and Light–Dark Cycles on Growth, Productivity, and Biochemical Composition
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Cultivation of Scenedesmus obliquus in Photobioreactors: Effects of Light Intensities and Light–Dark Cycles on Growth, Productivity, and Biochemical Composition
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Journal Article
Cultivation of Scenedesmus obliquus in Photobioreactors: Effects of Light Intensities and Light–Dark Cycles on Growth, Productivity, and Biochemical Composition
2014
Overview
One of the main parameters influencing microalgae production is light, which provides energy to support metabolism but, if present in excess, can lead to oxidative stress and growth inhibition. In this work, the influence of illumination on Scenedesmus obliquus growth was assessed by cultivating cells at different light intensities in a flat plate photobioreactor. S. obliquus showed a maximum growth rate at 150 μmol photons m⁻² s⁻¹. Below this value, light was limiting for growth, while with more intense illumination photosaturation effects were observed, although cells still showed the ability to duplicate. Looking at the biochemical composition, light affected the pigment contents only while carbohydrate, lipid, and protein contents remained stable. By considering that in industrial photobioreactors microalgae cells are subjected to light–dark cycles due to mixing, algae were also grown under pulsed illumination (5, 10, and 15 Hz). Interestingly, the ability to exploit pulsed light with good efficiency required a pre-acclimation to the same conditions, suggesting the presence of a biological response to these conditions.
Publisher
Springer-Verlag,Springer US,Springer,Springer Nature B.V
Subject
/ Algae
/ Algal Proteins - biosynthesis
/ Biological and medical sciences
/ Biomass
/ Carbohydrates - biosynthesis
/ Chemistry and Materials Science
/ Energy
/ Fundamental and applied biological sciences. Psychology
/ Industrial applications and implications. Economical aspects
/ Light
/ lighting
/ Lipids
/ Methods. Procedures. Technologies
/ Microalgae - growth & development
/ Microalgae - radiation effects
/ mixing
/ Scenedesmus - growth & development
