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LaPanse AJ, Krishnan A, Dennis G, Karns DAJ, Dahlin LR, Van Wychen S, Burch TA, Guarnieri MT, Weissman JC, Posewitz MC. Proximate biomass characterization of the high productivity marine microalga Picochlorum celeri TG2. Plant Physiol Biochem 2024; 207:108364. [PMID: 38232496 DOI: 10.1016/j.plaphy.2024.108364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 12/23/2023] [Accepted: 01/10/2024] [Indexed: 01/19/2024]
Abstract
Microalgae are compelling renewable resources with applications including biofuels, bioplastics, nutrient supplements, and cosmetic products. Picochlorum celeri is an alga with high industrial interest due to exemplary outdoor areal biomass productivities in seawater. Detailed proximate analysis is needed in multiple environmental conditions to understand the dynamic biomass compositions of P. celeri, and how these compositions might be leveraged in biotechnological applications. In this study, biomass characterization of P. celeri was performed under nutrient-replete, nitrogen-restricted, and hyper-saline conditions. Nutrient-replete cultivation of P. celeri resulted in protein-rich biomass (∼50% ash-free dry weight) with smaller carbohydrate (∼12% ash-free dry weight) and lipid (∼11% ash-free dry weight) partitions. Gradual nitrogen depletion elicited a shift from proteins to carbohydrates (∼50% ash-free dry weight, day 3) as cells transitioned into the production of storage metabolites. Importantly, dilutions in nitrogen-restricted 40 parts per million (1.43 mM nitrogen) media generated high-carbohydrate (∼50% ash-free dry weight) biomass without substantially compromising biomass productivity (36 g ash-free dry weight m-2 day-1) despite decreased chlorophyll (∼2% ash-free dry weight) content. This strategy for increasing carbohydrate content allowed for the targeted production of polysaccharides, which could potentially be utilized to produce fuels, oligosaccharides, and bioplastics. Cultivation at 2X sea salts resulted in a shift towards carbohydrates from protein, with significantly increased levels of the amino acid proline, which putatively acts as an osmolyte. A detailed understanding of the biomass composition of P. celeri in nutrient-replete, nitrogen-restricted, and hyper saline conditions informs how this strain can be useful in the production of biotechnological products.
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Affiliation(s)
- Alaina J LaPanse
- Department of Chemistry, Colorado School of Mines, Golden, CO, 80401, USA.
| | - Anagha Krishnan
- Department of Chemistry, Colorado School of Mines, Golden, CO, 80401, USA
| | - Galen Dennis
- Department of Chemistry, Colorado School of Mines, Golden, CO, 80401, USA
| | - Devin A J Karns
- Department of Chemistry, Colorado School of Mines, Golden, CO, 80401, USA
| | - Lukas R Dahlin
- Biosciences Center, National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | - Stefanie Van Wychen
- Renewable Resources and Enabling Sciences Center, National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | - Tyson A Burch
- Department of Chemistry, Colorado School of Mines, Golden, CO, 80401, USA
| | - Michael T Guarnieri
- Biosciences Center, National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | - Joseph C Weissman
- Department of Chemistry, Colorado School of Mines, Golden, CO, 80401, USA
| | - Matthew C Posewitz
- Department of Chemistry, Colorado School of Mines, Golden, CO, 80401, USA
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Safi C, Olivieri G, Engelen-Smit N, Spekking W, Veloo R, den Broek LAMV, Sijtsma L. Effect of growth conditions on the efficiency of cell disruption of Neochloris oleoabundans. Bioresour Technol 2020; 300:122699. [PMID: 31901515 DOI: 10.1016/j.biortech.2019.122699] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 12/23/2019] [Accepted: 12/24/2019] [Indexed: 06/10/2023]
Abstract
The impact of four different growth conditions on the cell disruption efficiency of Neochloris oleoabundans was investigated. A mechanical and biological cell disruption methods were evaluated separately and combined. It has been established that microalgae grown in marine water under nitrogen deprivation were the most resistant against cell disruption methods and released the lowest amount of proteins. The release of lipids, however, followed the "hindered molecule diffusion phenomenon" because it did not follow the same release pattern as proteins. The enzymatic treatment was efficient enough to release the majority of the proteins without combining it with high-pressure homogenization. Regarding energy input, Neochloris oleoabundans grown in marine water under nitrogen deprivation required the highest energy input to release proteins (Ep = 13.76 kWh.kg-1) and to break the cells by high-pressure homogenization (Ex - HPH = 1.14 kWh.kg-1) or by the combination of enzymes and High-pressure homogenization (Ex - ENZ = 2.79 kWh.kg-1).
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Affiliation(s)
- C Safi
- Wageningen Food & Biobased Research, Wageningen University and Research, PO Box 17, 6700 AA Wageningen, The Netherlands.
| | - G Olivieri
- Bioprocess Engineering Group, AlgaePARC, Wageningen University and Research, Droevendaalsesteeg 1, P.O. Box 8129, 6708 PB Wageningen, The Netherlands; Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale - Università degli Studi di Napoli Federico II - Piazzale V, Tecchio 80, 80125 Napoli, Italy
| | - N Engelen-Smit
- Wageningen Food & Biobased Research, Wageningen University and Research, PO Box 17, 6700 AA Wageningen, The Netherlands
| | - W Spekking
- Wageningen Food & Biobased Research, Wageningen University and Research, PO Box 17, 6700 AA Wageningen, The Netherlands
| | - R Veloo
- Wageningen Food & Biobased Research, Wageningen University and Research, PO Box 17, 6700 AA Wageningen, The Netherlands
| | - L A M van den Broek
- Wageningen Food & Biobased Research, Wageningen University and Research, PO Box 17, 6700 AA Wageningen, The Netherlands
| | - L Sijtsma
- Wageningen Food & Biobased Research, Wageningen University and Research, PO Box 17, 6700 AA Wageningen, The Netherlands
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