Cited by 2,879Algal biology and biofuel productionMicrobial Metabolic Engineering and BioproductionLipid metabolism and biosynthesis

Microalgae for oil: Strain selection, induction of lipid synthesis and outdoor mass cultivation in a low-cost photobioreactor

Rodolfi, Liliana, Chini Zittelli, Graziella, Bassi, Niccolò, Padovani, Giulia, Biondi, Natascia, Bonini, Gimena, Tredici, Mario R.·2009·Biotechnology and Bioengineering

Abstract

Thirty microalgal strains were screened in the laboratory for their biomass productivity and lipid content. Four strains (two marine and two freshwater), selected because robust, highly productive and with a relatively high lipid content, were cultivated under nitrogen deprivation in 0.6-L bubbled tubes. Only the two marine microalgae accumulated lipid under such conditions. One of them, the eustigmatophyte Nannochloropsis sp. F&M-M24, which attained 60% lipid content after nitrogen starvation, was grown in a 20-L Flat Alveolar Panel photobioreactor to study the influence of irradiance and nutrient (nitrogen or phosphorus) deprivation on fatty acid accumulation. Fatty acid content increased with high irradiances (up to 32.5% of dry biomass) and following both nitrogen and phosphorus deprivation (up to about 50%). To evaluate its lipid production potential under natural sunlight, the strain was grown outdoors in 110-L Green Wall Panel photobioreactors under nutrient sufficient and deficient conditions. Lipid productivity increased from 117 mg/L/day in nutrient sufficient media (with an average biomass productivity of 0.36 g/L/day and 32% lipid content) to 204 mg/L/day (with an average biomass productivity of 0.30 g/L/day and more than 60% final lipid content) in nitrogen deprived media. In a two-phase cultivation process (a nutrient sufficient phase to produce the inoculum followed by a nitrogen deprived phase to boost lipid synthesis) the oil production potential could be projected to be more than 90 kg per hectare per day. This is the first report of an increase of both lipid content and areal lipid productivity attained through nutrient deprivation in an outdoor algal culture. The experiments showed that this marine eustigmatophyte has the potential for an annual production of 20 tons of lipid per hectare in the Mediterranean climate and of more than 30 tons of lipid per hectare in sunny tropical areas.

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Crossref · 10.1002/bit.22033

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Authors
Rodolfi, L., Chini Zittelli, G., Bassi, N., Padovani, G., Biondi, N., Bonini, G., & Tredici, M. R.
Affiliations
University of Florence (IT)
Corresponding author
Tredici, Mario R.
Venue
Biotechnology and Bioengineering
Publisher
Wiley
Published
2008-08-05
Volume
102
Issue
1
Pages
100-112
ISSN
  • 0006-3592 (ISSN-L)
  • 1097-0290
OpenAlex
W2021429484
Cited by
2,879
References
44
Citations by year
2026: 57 · 2025: 80 · 2024: 94 · 2023: 112 · 2022: 147 · 2021: 157 · 2020: 189 · 2019: 186 · 2018: 165 · 2017: 211 · 2016: 235 · 2015: 238 · 2014: 260 · 2013: 270 · 2012: 225
FWCI
47.05
Type
journal article
Language
en
Open access
closed
Locations
  • Biotechnology and Bioengineering (publishedVersion)
  • PubMed (publishedVersion)
  • Florence Research (University of Florence) (submittedVersion)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
Keywords
microalgae, microalgae oil, lipid accumulation, nitrogen starvation, phosphorus deprivation, Nannochloropsis, eustigmatophytes, strain selection, photobioreactors, fatty acid accumulation, irradiance, two-phase cultivation, biomass productivity, biofuel feedstock
MeSH terms
Culture Media, Light, Lipids, Biomass, Bioreactors, Eukaryota

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