Neochloris oleoabundans Growth Evaluation Under Different Nitrogen:Phosphorus:Carbon Feeding Strategies
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Neochloris oleoabundans Growth Evaluation Under Different Nitrogen:Phosphorus:Carbon Feeding Strategies Ivan A. Avila‑León1 · Livia S. Ferreira‑Camargo2 · Marcelo C. Matsudo3 · João C. M. Carvalho1 Received: 24 March 2020 / Accepted: 28 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Microalgae are photosynthetic microorganisms known for their variety of compounds that can be useful for food, feed, pharmaceuticals, and fuel industries. Microalgae production costs have been one of the major obstacles to large-scale commercial production. Therefore, several studies are still being performed aiming to increase biomass by developing novel photobioreactor design and microalgae cultivation techniques. This work’s purpose is to increase Neochloris oleoabundans biomass. Different nutrient-feeding regimes were tested in N. oleoabundans cultivation in Erlenmeyer flasks and benchscale tubular photobioreactor. In Erlenmeyer flasks, the best concentrations of nitrate and phosphate were 8.82 mM and 5.16 mM, respectively. In bench-scale tubular photobioreactor, NaNO3 proved to be the best nitrogen source, in comparison with ( NH4)2SO4 and N H4NO3. Still in the photobioreator, the addition of nitrate by fed-batch process combined with automated system of CO2 feeding showed to be of utmost importance for insuring a high density of N. oleoabundans. The essential nutrients evaluated in this work play an important role on N. oleoabundans biomass accumulation, as well as the photobioreactor configuration and feeding regimes.
Introduction Microalgae, when compared to plants, are important candidates to become source of renewable bioenergy, food, feed, biopharmaceuticals, and cosmetic bioactive molecules, mainly because of their high photosynthetic efficiency, high biomass productivity, and high rate of carbon dioxide fixation. Moreover, microalgae are easy to cultivate and their cultivation may take place in areas not suitable for crops and can be done by reusing wastewater [1–3]. All these advantages make microalgae particularly interesting for researchers to keep exploring their cultivation and applications.
* João C. M. Carvalho [email protected] 1
Department of Biochemical and Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, University of São Paulo, Av. Prof. Lineu Prestes 580, Bl. 16, São Paulo, SP 05508‑900, Brazil
2
Center for Natural and Human Sciences, Federal University of ABC, Av. dos Estados, 5001 Bl. B, Santo André, SP 09210‑580, Brazil
3
Federal University of Itajubá. Institute of Natural Resources, Av. Benedito Pereira dos Santos, 1303, Itajubá, M.G. 37500‑903, Brazil
Neochloris oleoabundans is a promising microalga species due to its natural high-lipid content when compared to other microalgae, which reflects on its application in the biofuel industry [4–6]. Although there are many studies focusing on this microalga’s lipid production, there are few about its biomass production and no information about its large-scale production, also because of t
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