Effects of salinity on growth and lipid accumulation of biofuel microalga Nannochloropsis salina and invading organisms

Mass production of microalgae is currently limited by existing cultivation strategies, which rely heavily on open cultivation systems. Increasing lipid production in these systems while minimizing the invasion of non-target algae (competitors) and grazers (predators) will improve the economic viabil...

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Vydáno v:Biomass & bioenergy Ročník 54; číslo 2013; s. 83 - 88
Hlavní autoři: Bartley, Meridith L., Boeing, Wiebke J., Corcoran, Alina A., Holguin, F. Omar, Schaub, Tanner
Médium: Journal Article
Jazyk:angličtina
Vydáno: Kidlington Elsevier Ltd 01.07.2013
Elsevier
Témata:
09 BIOMASS FUELS
Algal Biofuels
Algal culture (microalgae)
biofuels
Biological and medical sciences
biomass
Biotechnology
economic sustainability
Fundamental and applied biological sciences. Psychology
Invaders
Invasive organisms
Lipid accumulation
lipid content
Lipid profile
mass spectrometry
Methods. Procedures. Technologies
Micro-algae biodiesel
microalgae
Nannochloropsis
Nannochloropsis salina
predators
production technology
Salinity
salt stress
triacylglycerols
Lipid profile
Lipid accumulation
Micro-algae biodiesel
Invasive organisms
Invaders
Salinity
Growth rate
Algae
Lipids
Biomass
Heterokontophyta
Invasive species
Plankton
Alga
Biological accumulation
ISSN:0961-9534, 1873-2909
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Shrnutí:Mass production of microalgae is currently limited by existing cultivation strategies, which rely heavily on open cultivation systems. Increasing lipid production in these systems while minimizing the invasion of non-target algae (competitors) and grazers (predators) will improve the economic viability of algal biofuel. In this study, we manipulate a basic environmental parameter, salinity, to promote algal growth and limit invading organisms. We monitor the growth of marine microalga Nannochloropsis salina and invasion of algal competitors and predators in open cultures grown at different salinities ranging from brackish to hypersaline. Algal growth and biomass was greatest at salinities of 22 and 34 PSU, whereas the density of invading organisms was lowest at 22 PSU. To determine if lipid accumulation could be maximized by salinity stress, we grew N. salina at 22 PSU until the populations were at stationary phase and then increased salinity to 34, 46, and 58 PSU. Gravimetrically determined lipid content increased significantly at these higher salinities, and was highest at 34 PSU (36% dry tissue mass). Analysis of Folch extracts by FT-ICR mass spectrometry showed a monotonic increase in triglyceride content and decreased membrane lipid content with increased salinity. Together, this work demonstrates an ecological approach to overcome the current limitations of cultivation strategies. •Marine microalgae Nannochloropsis salina can be grown for biofuel production.•We evaluate effects of salinity on algae growth, lipids and invading organisms.•N. salina growth fastest at salinities of 22–34 PSU.•Invading organisms are limited at 22 PSU.•Highest lipid accumulation is observed when salinity is changed from 22 to 34 PSU.
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EE0003046
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
DOE-DANF-0003046-K2
ISSN:0961-9534
1873-2909
DOI:10.1016/j.biombioe.2013.03.026