Effects of environmental factors and metals on selenastrum capricornutum lipids

McLarnon-Riches, Christian J; Rolph, Carole E.; Greenway, D. L. A.; Robinson, Peter

doi:10.1016/s0031-9422(98)00095-8

Cited by 57 publications

(24 citation statements)

References 36 publications

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“…A gradual increase in α-tocopherol production during the life cycle was also recorded [83]. Dark treatment caused a decrease in the relative proportion of oleate fatty acid and an increase in linoleate fatty acid in the green alga Selenastrum capricornutum [58]. In the dinoflagellate Prorocentrum minimum dark exposure led to a reduced content of TAG and galactosylglycerides, while the total content of phospholipids changed little [58].…”

Section: Light Irradiation Stressmentioning

confidence: 90%

“…Dark treatment caused a decrease in the relative proportion of oleate fatty acid and an increase in linoleate fatty acid in the green alga Selenastrum capricornutum [58]. In the dinoflagellate Prorocentrum minimum dark exposure led to a reduced content of TAG and galactosylglycerides, while the total content of phospholipids changed little [58]. Light irradiation can only be controlled in a closed system bioreactors or in laboratory-scale cultures, as shown by the examples above.…”

Section: Light Irradiation Stressmentioning

confidence: 99%

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High Lipid Induction in Microalgae for Biodiesel Production

2012

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Oil-accumulating microalgae have the potential to enable large-scale biodiesel production without competing for arable land or biodiverse natural landscapes. High lipid productivity of dominant, fast-growing algae is a major prerequisite for commercial production of microalgal oil-derived biodiesel. However, under optimal growth conditions, large amounts of algal biomass are produced, but with relatively low lipid contents, while species with high lipid contents are typically slow growing. Major advances in this area can be made through the induction of lipid biosynthesis, e.g., by environmental stresses. Lipids, in the form of triacylglycerides typically provide a storage function in the cell that enables microalgae to endure adverse environmental conditions. Essentially algal biomass and triacylglycerides compete for photosynthetic assimilate and a reprogramming of physiological pathways is required to stimulate lipid biosynthesis. There has been a wide range of studies carried out to identify and develop efficient lipid induction techniques in microalgae such as nutrients stress (e.g., nitrogen and/or phosphorus starvation), osmotic stress, radiation, pH, temperature, heavy metals and other chemicals. In addition, several genetic strategies for increased triacylglycerides production and inducibility are currently being developed. In this review, we discuss the potential of lipid induction techniques in microalgae and also their application at commercial scale for the production of biodiesel.

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Section: Light Irradiation Stressmentioning

confidence: 90%

Section: Light Irradiation Stressmentioning

confidence: 99%

High Lipid Induction in Microalgae for Biodiesel Production

2012

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“…This observation also indicates TAG consumption in the dark phase (Fisher and Schwarzenbach 1978;Chauton et al 2013). In the green alga Selenastrum capricornutum the MUFA/PUFA ratio also decreased together with a decrease of the FA content by 50% after exposure to 7 days darkness (McLarnon-Riches et al 1998). …”

Section: Fatty Acid Compostitionmentioning

confidence: 99%

Effects of prolonged darkness and temperature on the lipid metabolism in the benthic diatom Navicula perminuta from the Arctic Adventfjorden, Svalbard

et al. 2017

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which could consequently lead to a depletion of this energy reserves before the end of the polar night. On the other hand, the membrane building phospho-and glycolipids remained unchanged during the 8 weeks darkness, indicating still intact thylakoid membranes. These results explain the shorter survival times of polar diatoms with increasing water temperatures during prolonged dark periods. Abstract The Arctic represents an extreme habitat for phototrophic algae due to long periods of darkness caused by the polar night (~4 months darkness). Benthic diatoms, which dominate microphytobenthic communities in shallow water regions, can survive this dark period, but the underlying physiological and biochemical mechanisms are not well understood. One of the potential mechanisms for long-term dark survival is the utilisation of stored energy products in combination with a reduced basic metabolism. In recent years, water temperatures in the Arctic increased due to an ongoing global warming. Higher temperatures could enhance the cellular energy requirements for the maintenance metabolism during darkness and, therefore, accelerate the consumption of lipid reserves. In this study, we investigated the macromolecular ratios and the lipid content and composition of Navicula cf. perminuta Grunow, an Arctic benthic diatom isolated from the microphytobenthos of Adventfjorden (Svalbard, Norway), over a dark period of 8 weeks at two different temperatures (0 and 7 °C). The results demonstrate that N. perminuta uses the stored lipid compound triacylglycerol (TAG) during prolonged dark periods, but also the pool of free fatty acids (FFA). Under the enhanced temperature of 7 °C, the lipid resources were used significantly faster than at 0 °C, Keywords

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“…This study provides information about the surface physicochemical properties of the microalgae Chlorella vulgaris and Pseudokirchneriella subcapitata and the cyanobacteria Synechocystis salina and Microcystis aeruginosa determined experimentally, according to the method proposed by van Oss et al [27][28][29]. Selection of these microorganisms was based on the following factors [30][31][32][33]: (i) these microalgae and cyanobacteria can be easily grown in laboratory cultures and (ii) several authors have reported the use of these microorganisms in a wide variety of biotechnological applications, such as CO 2 capture, wastewater treatment, biofuel production and synthesis of bioactive compounds. Additionally, algal suspensions resulting from the co-culture of different associations between the selected microorganisms were evaluated, to determine if these associations have influence on surface physicochemical properties and on their ability to form aggregates.…”

Section: Introductionmentioning

confidence: 99%

Surface physicochemical properties of selected single and mixed cultures of microalgae and cyanobacteria and their relationship with sedimentation kinetics

Gonçalves

Ferreira

Loureiro

et al. 2015

Bioresour. Bioprocess.

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Background: Microalgae are photosynthetic microorganisms presenting a diversity of biotechnological applications. However, microalgal cultivation systems are not energetically and economically feasible. Possible strategies that can be applied to improve the feasibility of microalgal production include biofouling control in photobioreactors, the use of attached growth systems and bioflocculation. These processes are ruled by surface physicochemical properties. Accordingly, the surface physicochemical properties of Chlorella vulgaris, Pseudokirchneriella subcapitata, Synechocystis salina and Microcystis aeruginosa were determined through contact angle and zeta potential measurements. Additionally, mixed cultures of the selected microorganisms were performed. Sedimentation kinetics of the studied cultures was also evaluated to understand how surface physicochemical properties influence microalgal recovery. Results: All studied microorganisms, except S. salina, presented a hydrophilic surface. The co-culture of S. salina with the other studied microorganisms resulted in a more hydrophobic algal suspension. Regarding zeta potential determinations, all studied suspensions presented a negatively charged surface (approximately -40.8 ± 4.4 mV). Sedimentation experiments have shown that all microalgal suspensions presented low microalgal recovery efficiencies. However, a negative linear relationship between microalgal removal percentage and free energy of hydrophobic interaction was obtained. Conclusions:The evidence of a relationship between microalgal removal percentage and free energy of hydrophobic interaction demonstrates the importance of surface physicochemical properties on microalgal settling. However, the low recovery efficiencies achieved, as well as the high net zeta potential values determined, indicate that another factor to consider in microalgal settling is the ionic strength of the culture medium, which play an important role in suspensions' stability.

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Effects of environmental factors and metals on selenastrum capricornutum lipids

Cited by 57 publications

References 36 publications

High Lipid Induction in Microalgae for Biodiesel Production

High Lipid Induction in Microalgae for Biodiesel Production

Effects of prolonged darkness and temperature on the lipid metabolism in the benthic diatom Navicula perminuta from the Arctic Adventfjorden, Svalbard

Surface physicochemical properties of selected single and mixed cultures of microalgae and cyanobacteria and their relationship with sedimentation kinetics

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